{"id":260,"date":"2022-05-31T09:17:40","date_gmt":"2022-05-31T01:17:40","guid":{"rendered":"http:\/\/www.wangzheduo.com\/?p=260"},"modified":"2022-05-31T09:17:40","modified_gmt":"2022-05-31T01:17:40","slug":"%e8%bf%9e%e5%85%ab%e8%82%a1%e6%96%87%e9%83%bd%e4%b8%8d%e6%87%82%e8%bf%98%e6%8c%87%e6%9c%9b%e5%9c%a8%e5%89%8d%e7%ab%af%e6%b7%b7%e4%b8%8b%e5%8e%bb%e4%b9%88","status":"publish","type":"post","link":"https:\/\/biji.niaowan.com\/?p=260","title":{"rendered":"\u8fde\u516b\u80a1\u6587\u90fd\u4e0d\u61c2\u8fd8\u6307\u671b\u5728\u524d\u7aef\u6df7\u4e0b\u53bb\u4e48"},"content":{"rendered":"

\u5e9f\u8bdd\u53ea\u8bf4\u4e00\u53e5\uff1a\u7801\u5b57\u4e0d\u6613\u6c42\u4e2a?\uff0c\u6536\u85cf === \u5b66\u4f1a,\u5feb\u884c\u52a8\u8d77\u6765\u5427\uff01?\u200d?\u200d?\u200d\u30022022.05.19
\n\u7531\u4e8e\u7bc7\u5e45\u9650\u5236\u66f4\u8be6\u7ec6\u7684\u5185\u5bb9\u5df2\u66f4\u65b0\u5230 \u261e \u6211\u7684 GitHub \u4e0a\uff0c\u6709\u7ea0\u6b63\u9519\u8bef\u548c\u9700\u8981\u8865\u5145\u7684\u5c0f\u4f19\u4f34\u53ef\u4ee5\u5728\u8fd9\u91cc\u7559\u8a00\uff0c\u6211\u4f1a\u53ca\u65f6\u66f4\u65b0\u4e0a\u53bb\u7684<\/p>\n

1. HTTP \u548c HTTPS
\n1.http \u548c https \u7684\u57fa\u672c\u6982\u5ff5
\nhttp: \u662f\u4e00\u4e2a\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u8bf7\u6c42\u548c\u5e94\u7b54\u7684\u6807\u51c6\uff08TCP\uff09\uff0c\u7528\u4e8e\u4ece WWW \u670d\u52a1\u5668\u4f20\u8f93\u8d85\u6587\u672c\u5230\u672c\u5730\u6d4f\u89c8\u5668\u7684\u8d85\u6587\u672c\u4f20\u8f93\u534f\u8bae\u3002
\nhttps:\u662f\u4ee5\u5b89\u5168\u4e3a\u76ee\u6807\u7684 HTTP \u901a\u9053\uff0c\u5373 HTTP \u4e0b \u52a0\u5165 SSL \u5c42\u8fdb\u884c\u52a0\u5bc6\u3002\u5176\u4f5c\u7528\u662f\uff1a\u5efa\u7acb\u4e00\u4e2a\u4fe1\u606f\u5b89\u5168\u901a\u9053\uff0c\u6765\u786e\u4fdd\u6570\u636e\u7684\u4f20\u8f93\uff0c\u786e\u4fdd\u7f51\u7ad9\u7684\u771f\u5b9e\u6027\u3002
\n2.http \u548c https \u7684\u533a\u522b\u53ca\u4f18\u7f3a\u70b9\uff1f<\/p>\n

http \u662f\u8d85\u6587\u672c\u4f20\u8f93\u534f\u8bae\uff0c\u4fe1\u606f\u662f\u660e\u6587\u4f20\u8f93\uff0cHTTPS \u534f\u8bae\u8981\u6bd4 http \u534f\u8bae\u5b89\u5168\uff0chttps \u662f\u5177\u6709\u5b89\u5168\u6027\u7684 ssl \u52a0\u5bc6\u4f20\u8f93\u534f\u8bae\uff0c\u53ef\u9632\u6b62\u6570\u636e\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u88ab\u7a83\u53d6\u3001\u6539\u53d8\uff0c\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027(\u5f53\u7136\u8fd9\u79cd\u5b89\u5168\u6027\u5e76\u975e\u7edd\u5bf9\u7684\uff0c\u5bf9\u4e8e\u66f4\u6df1\u5165\u7684 Web \u5b89\u5168\u95ee\u9898\uff0c\u6b64\u5904\u6682\u4e14\u4e0d\u8868)\u3002
\nhttp \u534f\u8bae\u7684\u9ed8\u8ba4\u7aef\u53e3\u4e3a 80\uff0chttps \u7684\u9ed8\u8ba4\u7aef\u53e3\u4e3a 443\u3002
\nhttp \u7684\u8fde\u63a5\u5f88\u7b80\u5355\uff0c\u662f\u65e0\u72b6\u6001\u7684\u3002https \u63e1\u624b\u9636\u6bb5\u6bd4\u8f83\u8d39\u65f6\uff0c\u4f1a\u4f7f\u9875\u9762\u52a0\u8f7d\u65f6\u95f4\u5ef6\u957f 50%\uff0c\u589e\u52a0 10%~20%\u7684\u8017\u7535\u3002
\nhttps \u7f13\u5b58\u4e0d\u5982 http \u9ad8\u6548\uff0c\u4f1a\u589e\u52a0\u6570\u636e\u5f00\u9500\u3002
\nHttps \u534f\u8bae\u9700\u8981 ca \u8bc1\u4e66\uff0c\u8d39\u7528\u8f83\u9ad8\uff0c\u529f\u80fd\u8d8a\u5f3a\u5927\u7684\u8bc1\u4e66\u8d39\u7528\u8d8a\u9ad8\u3002
\nSSL \u8bc1\u4e66\u9700\u8981\u7ed1\u5b9a IP\uff0c\u4e0d\u80fd\u518d\u540c\u4e00\u4e2a IP \u4e0a\u7ed1\u5b9a\u591a\u4e2a\u57df\u540d\uff0cIPV4 \u8d44\u6e90\u652f\u6301\u4e0d\u4e86\u8fd9\u79cd\u6d88\u8017\u3002<\/p>\n

3.https \u534f\u8bae\u7684\u5de5\u4f5c\u539f\u7406
\n\u5ba2\u6237\u7aef\u5728\u4f7f\u7528 HTTPS \u65b9\u5f0f\u4e0e Web \u670d\u52a1\u5668\u901a\u4fe1\u65f6\u6709\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\uff1a<\/p>\n

\u5ba2\u6237\u7aef\u4f7f\u7528 https url \u8bbf\u95ee\u670d\u52a1\u5668\uff0c\u5219\u8981\u6c42 web \u670d\u52a1\u5668\u5efa\u7acb ssl \u94fe\u63a5\u3002
\nweb \u670d\u52a1\u5668\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u4e4b\u540e\uff0c\u4f1a\u5c06\u7f51\u7ad9\u7684\u8bc1\u4e66\uff08\u8bc1\u4e66\u4e2d\u5305\u542b\u4e86\u516c\u94a5\uff09\uff0c\u4f20\u8f93\u7ed9\u5ba2\u6237\u7aef\u3002
\n\u5ba2\u6237\u7aef\u548c web \u670d\u52a1\u5668\u7aef\u5f00\u59cb\u534f\u5546 SSL \u94fe\u63a5\u7684\u5b89\u5168\u7b49\u7ea7\uff0c\u4e5f\u5c31\u662f\u52a0\u5bc6\u7b49\u7ea7\u3002
\n\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u901a\u8fc7\u53cc\u65b9\u534f\u5546\u4e00\u81f4\u7684\u5b89\u5168\u7b49\u7ea7\uff0c\u5efa\u7acb\u4f1a\u8bdd\u5bc6\u94a5\uff0c\u7136\u540e\u901a\u8fc7\u7f51\u7ad9\u7684\u516c\u94a5\u6765\u52a0\u5bc6\u4f1a\u8bdd\u5bc6\u94a5\uff0c\u5e76\u4f20\u9001\u7ed9\u7f51\u7ad9\u3002
\nweb \u670d\u52a1\u5668\u901a\u8fc7\u81ea\u5df1\u7684\u79c1\u94a5\u89e3\u5bc6\u51fa\u4f1a\u8bdd\u5bc6\u94a5\u3002
\nweb \u670d\u52a1\u5668\u901a\u8fc7\u4f1a\u8bdd\u5bc6\u94a5\u52a0\u5bc6\u4e0e\u5ba2\u6237\u7aef\u4e4b\u95f4\u7684\u901a\u4fe1\u3002<\/p>\n

\u4f20\u9001\u95e8 \u261e # \u89e3\u8bfb HTTP1\/HTTP2\/HTTP3
\nTCP\u4e09\u6b21\u63e1\u624b<\/p>\n

\u7b2c\u4e00\u6b21\u63e1\u624b\uff1a\u5efa\u7acb\u8fde\u63a5\u65f6\uff0c\u5ba2\u6237\u7aef\u53d1\u9001syn\u5305\uff08syn=j\uff09\u5230\u670d\u52a1\u5668\uff0c\u5e76\u8fdb\u5165SYN_SENT\u72b6\u6001\uff0c\u7b49\u5f85\u670d\u52a1\u5668\u786e\u8ba4\uff1bSYN\uff1a\u540c\u6b65\u5e8f\u5217\u7f16\u53f7\uff08Synchronize Sequence Numbers\uff09\u3002
\n\u7b2c\u4e8c\u6b21\u63e1\u624b\uff1a\u670d\u52a1\u5668\u6536\u5230syn\u5305\u5e76\u786e\u8ba4\u5ba2\u6237\u7684SYN\uff08ack=j+1\uff09\uff0c\u540c\u65f6\u4e5f\u53d1\u9001\u4e00\u4e2a\u81ea\u5df1\u7684SYN\u5305\uff08syn=k\uff09\uff0c\u5373SYN+ACK\u5305\uff0c\u6b64\u65f6\u670d\u52a1\u5668\u8fdb\u5165SYN_RECV\u72b6\u6001\uff1b
\n\u7b2c\u4e09\u6b21\u63e1\u624b\uff1a\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684SYN+ACK\u5305\uff0c\u5411\u670d\u52a1\u5668\u53d1\u9001\u786e\u8ba4\u5305ACK(ack=k+1\uff09\uff0c\u6b64\u5305\u53d1\u9001\u5b8c\u6bd5\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u8fdb\u5165ESTABLISHED\uff08TCP\u8fde\u63a5\u6210\u529f\uff09\u72b6\u6001\uff0c\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u3002<\/p>\n

\u63e1\u624b\u8fc7\u7a0b\u4e2d\u4f20\u9001\u7684\u5305\u91cc\u4e0d\u5305\u542b\u6570\u636e\uff0c\u4e09\u6b21\u63e1\u624b\u5b8c\u6bd5\u540e\uff0c\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u624d\u6b63\u5f0f\u5f00\u59cb\u4f20\u9001\u6570\u636e\u3002<\/p>\n

TCP \u56db\u6b21\u6325\u624b<\/p>\n

\u5ba2\u6237\u7aef\u8fdb\u7a0b\u53d1\u51fa\u8fde\u63a5\u91ca\u653e\u62a5\u6587\uff0c\u5e76\u4e14\u505c\u6b62\u53d1\u9001\u6570\u636e\u3002\u91ca\u653e\u6570\u636e\u62a5\u6587\u9996\u90e8\uff0cFIN=1\uff0c\u5176\u5e8f\u5217\u53f7\u4e3aseq=u\uff08\u7b49\u4e8e\u524d\u9762\u5df2\u7ecf\u4f20\u9001\u8fc7\u6765\u7684\u6570\u636e\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u7684\u5e8f\u53f7\u52a01\uff09\uff0c\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef\u8fdb\u5165FIN-WAIT-1\uff08\u7ec8\u6b62\u7b49\u5f851\uff09\u72b6\u6001\u3002 TCP\u89c4\u5b9a\uff0cFIN\u62a5\u6587\u6bb5\u5373\u4f7f\u4e0d\u643a\u5e26\u6570\u636e\uff0c\u4e5f\u8981\u6d88\u8017\u4e00\u4e2a\u5e8f\u53f7\u3002<\/p>\n

2\uff09\u670d\u52a1\u5668\u6536\u5230\u8fde\u63a5\u91ca\u653e\u62a5\u6587\uff0c\u53d1\u51fa\u786e\u8ba4\u62a5\u6587\uff0cACK=1\uff0cack=u+1\uff0c\u5e76\u4e14\u5e26\u4e0a\u81ea\u5df1\u7684\u5e8f\u5217\u53f7seq=v\uff0c\u6b64\u65f6\uff0c\u670d\u52a1\u7aef\u5c31\u8fdb\u5165\u4e86CLOSE-WAIT\uff08\u5173\u95ed\u7b49\u5f85\uff09\u72b6\u6001\u3002TCP\u670d\u52a1\u5668\u901a\u77e5\u9ad8\u5c42\u7684\u5e94\u7528\u8fdb\u7a0b\uff0c\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u7684\u65b9\u5411\u5c31\u91ca\u653e\u4e86\uff0c\u8fd9\u65f6\u5019\u5904\u4e8e\u534a\u5173\u95ed\u72b6\u6001\uff0c\u5373\u5ba2\u6237\u7aef\u5df2\u7ecf\u6ca1\u6709\u6570\u636e\u8981\u53d1\u9001\u4e86\uff0c\u4f46\u662f\u670d\u52a1\u5668\u82e5\u53d1\u9001\u6570\u636e\uff0c\u5ba2\u6237\u7aef\u4f9d\u7136\u8981\u63a5\u53d7\u3002\u8fd9\u4e2a\u72b6\u6001\u8fd8\u8981\u6301\u7eed\u4e00\u6bb5\u65f6\u95f4\uff0c\u4e5f\u5c31\u662f\u6574\u4e2aCLOSE-WAIT\u72b6\u6001\u6301\u7eed\u7684\u65f6\u95f4\u3002
\n3\uff09\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684\u786e\u8ba4\u8bf7\u6c42\u540e\uff0c\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef\u5c31\u8fdb\u5165FIN-WAIT-2\uff08\u7ec8\u6b62\u7b49\u5f852\uff09\u72b6\u6001\uff0c\u7b49\u5f85\u670d\u52a1\u5668\u53d1\u9001\u8fde\u63a5\u91ca\u653e\u62a5\u6587\uff08\u5728\u8fd9\u4e4b\u524d\u8fd8\u9700\u8981\u63a5\u53d7\u670d\u52a1\u5668\u53d1\u9001\u7684\u6700 \u540e\u7684\u6570\u636e\uff09\u3002
\n4\uff09\u670d\u52a1\u5668\u5c06\u6700\u540e\u7684\u6570\u636e\u53d1\u9001\u5b8c\u6bd5\u540e\uff0c\u5c31\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u8fde\u63a5\u91ca\u653e\u62a5\u6587\uff0cFIN=1\uff0cack=u+1\uff0c\u7531\u4e8e\u5728\u534a\u5173\u95ed\u72b6\u6001\uff0c\u670d\u52a1\u5668\u5f88\u53ef\u80fd\u53c8\u53d1\u9001\u4e86\u4e00\u4e9b\u6570\u636e\uff0c\u5047\u5b9a\u6b64\u65f6\u7684\u5e8f\u5217\u53f7\u4e3aseq=w\uff0c\u6b64\u65f6\uff0c\u670d\u52a1\u5668\u5c31\u8fdb\u5165\u4e86LAST-ACK\uff08\u6700\u540e\u786e\u8ba4\uff09\u72b6\u6001\uff0c\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u786e\u8ba4\u3002
\n5\uff09\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684\u8fde\u63a5\u91ca\u653e\u62a5\u6587\u540e\uff0c\u5fc5\u987b\u53d1\u51fa\u786e\u8ba4\uff0cACK=1\uff0cack=w+1\uff0c\u800c\u81ea\u5df1\u7684\u5e8f\u5217\u53f7\u662fseq=u+1\uff0c\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef\u5c31\u8fdb\u5165\u4e86TIME-WAIT\uff08\u65f6\u95f4\u7b49\u5f85\uff09\u72b6\u6001\u3002\u6ce8\u610f\u6b64\u65f6TCP\u8fde\u63a5\u8fd8\u6ca1\u6709\u91ca\u653e\uff0c\u5fc5\u987b\u7ecf\u8fc72\u2217\u2217MSL\uff08\u6700\u957f\u62a5\u6587\u6bb5\u5bff\u547d\uff09\u7684\u65f6\u95f4\u540e\uff0c\u5f53\u5ba2\u6237\u7aef\u64a4\u9500\u76f8\u5e94\u7684TCB\u540e\uff0c\u624d\u8fdb\u5165CLOSED\u72b6\u6001\u3002
\n6\uff09\u670d\u52a1\u5668\u53ea\u8981\u6536\u5230\u4e86\u5ba2\u6237\u7aef\u53d1\u51fa\u7684\u786e\u8ba4\uff0c\u7acb\u5373\u8fdb\u5165CLOSED\u72b6\u6001\u3002\u540c\u6837\uff0c\u64a4\u9500TCB\u540e\uff0c\u5c31\u7ed3\u675f\u4e86\u8fd9\u6b21\u7684TCP\u8fde\u63a5\u3002\u53ef\u4ee5\u770b\u5230\uff0c\u670d\u52a1\u5668\u7ed3\u675fTCP\u8fde\u63a5\u7684\u65f6\u95f4\u8981\u6bd4\u5ba2\u6237\u7aef\u65e9\u4e00\u4e9b\u3002
\nTCP\/IP \/ \u5982\u4f55\u4fdd\u8bc1\u6570\u636e\u5305\u4f20\u8f93\u7684\u6709\u5e8f\u53ef\u9760\uff1f
\n\u5bf9\u5b57\u8282\u6d41\u5206\u6bb5\u5e76\u8fdb\u884c\u7f16\u53f7\u7136\u540e\u901a\u8fc7\u00a0ACK \u56de\u590d\u548c\u8d85\u65f6\u91cd\u53d1\u8fd9\u4e24\u4e2a\u673a\u5236\u6765\u4fdd\u8bc1\u3002
\n\uff081\uff09\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u5305\u7684\u53ef\u9760\u4f20\u9012\uff0c\u53d1\u9001\u65b9\u5fc5\u987b\u628a\u5df2\u53d1\u9001\u7684\u6570\u636e\u5305\u4fdd\u7559\u5728\u7f13\u51b2\u533a\uff1b
\n\uff082\uff09\u5e76\u4e3a\u6bcf\u4e2a\u5df2\u53d1\u9001\u7684\u6570\u636e\u5305\u542f\u52a8\u4e00\u4e2a\u8d85\u65f6\u5b9a\u65f6\u5668\uff1b
\n\uff083\uff09\u5982\u5728\u5b9a\u65f6\u5668\u8d85\u65f6\u4e4b\u524d\u6536\u5230\u4e86\u5bf9\u65b9\u53d1\u6765\u7684\u5e94\u7b54\u4fe1\u606f\uff08\u53ef\u80fd\u662f\u5bf9\u672c\u5305\u7684\u5e94\u7b54\uff0c\u4e5f\u53ef\u4ee5\u662f\u5bf9\u672c\u5305\u540e\u7eed\u5305\u7684\u5e94\u7b54\uff09\uff0c\u5219\u91ca\u653e\u8be5\u6570\u636e\u5305\u5360\u7528\u7684\u7f13\u51b2\u533a;
\n\uff084\uff09\u5426\u5219\uff0c\u91cd\u4f20\u8be5\u6570\u636e\u5305\uff0c\u76f4\u5230\u6536\u5230\u5e94\u7b54\u6216\u91cd\u4f20\u6b21\u6570\u8d85\u8fc7\u89c4\u5b9a\u7684\u6700\u5927\u6b21\u6570\u4e3a\u6b62\u3002
\n\uff085\uff09\u63a5\u6536\u65b9\u6536\u5230\u6570\u636e\u5305\u540e\uff0c\u5148\u8fdb\u884cCRC\u6821\u9a8c\uff0c\u5982\u679c\u6b63\u786e\u5219\u628a\u6570\u636e\u4ea4\u7ed9\u4e0a\u5c42\u534f\u8bae\uff0c\u7136\u540e\u7ed9\u53d1\u9001\u65b9\u53d1\u9001\u4e00\u4e2a\u7d2f\u8ba1\u5e94\u7b54\u5305\uff0c\u8868\u660e\u8be5\u6570\u636e\u5df2\u6536\u5230\uff0c\u5982\u679c\u63a5\u6536\u65b9\u6b63\u597d\u4e5f\u6709\u6570\u636e\u8981\u53d1\u7ed9\u53d1\u9001\u65b9\uff0c\u5e94\u7b54\u5305\u4e5f\u53ef\u65b9\u5728\u6570\u636e\u5305\u4e2d\u634e\u5e26\u8fc7\u53bb\u3002
\nTCP\u548cUDP\u7684\u533a\u522b<\/p>\n

TCP\u662f\u9762\u5411\u94fe\u63a5\u7684\uff0c\u800cUDP\u662f\u9762\u5411\u65e0\u8fde\u63a5\u7684\u3002
\nTCP\u4ec5\u652f\u6301\u5355\u64ad\u4f20\u8f93\uff0cUDP \u63d0\u4f9b\u4e86\u5355\u64ad\uff0c\u591a\u64ad\uff0c\u5e7f\u64ad\u7684\u529f\u80fd\u3002
\nTCP\u7684\u4e09\u6b21\u63e1\u624b\u4fdd\u8bc1\u4e86\u8fde\u63a5\u7684\u53ef\u9760\u6027; UDP\u662f\u65e0\u8fde\u63a5\u7684\u3001\u4e0d\u53ef\u9760\u7684\u4e00\u79cd\u6570\u636e\u4f20\u8f93\u534f\u8bae\uff0c\u9996\u5148\u4e0d\u53ef\u9760\u6027\u4f53\u73b0\u5728\u65e0\u8fde\u63a5\u4e0a\uff0c\u901a\u4fe1\u90fd\u4e0d\u9700\u8981\u5efa\u7acb\u8fde\u63a5\uff0c\u5bf9\u63a5\u6536\u5230\u7684\u6570\u636e\u4e5f\u4e0d\u53d1\u9001\u786e\u8ba4\u4fe1\u53f7\uff0c\u53d1\u9001\u7aef\u4e0d\u77e5\u9053\u6570\u636e\u662f\u5426\u4f1a\u6b63\u786e\u63a5\u6536\u3002
\nUDP\u7684\u5934\u90e8\u5f00\u9500\u6bd4TCP\u7684\u66f4\u5c0f\uff0c\u6570\u636e\u4f20\u8f93\u901f\u7387\u66f4\u9ad8\uff0c\u5b9e\u65f6\u6027\u66f4\u597d\u3002<\/p>\n

\u4f20\u9001\u95e8 \u261e # \u6df1\u5ea6\u5256\u6790TCP\u4e0eUDP\u7684\u533a\u522b
\nHTTP \u8bf7\u6c42\u8de8\u57df\u95ee\u9898<\/p>\n

\u8de8\u57df\u7684\u539f\u7406
\n\u8de8\u57df\uff0c\u662f\u6307\u6d4f\u89c8\u5668\u4e0d\u80fd\u6267\u884c\u5176\u4ed6\u7f51\u7ad9\u7684\u811a\u672c\u3002\u5b83\u662f\u7531\u6d4f\u89c8\u5668\u7684\u540c\u6e90\u7b56\u7565\u9020\u6210\u7684\u3002
\n\u540c\u6e90\u7b56\u7565,\u662f\u6d4f\u89c8\u5668\u5bf9 JavaScript \u5b9e\u65bd\u7684\u5b89\u5168\u9650\u5236\uff0c\u53ea\u8981\u534f\u8bae\u3001\u57df\u540d\u3001\u7aef\u53e3\u6709\u4efb\u4f55\u4e00\u4e2a\u4e0d\u540c\uff0c\u90fd\u88ab\u5f53\u4f5c\u662f\u4e0d\u540c\u7684\u57df\u3002
\n\u8de8\u57df\u539f\u7406\uff0c\u5373\u662f\u901a\u8fc7\u5404\u79cd\u65b9\u5f0f\uff0c\u907f\u5f00\u6d4f\u89c8\u5668\u7684\u5b89\u5168\u9650\u5236\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6848
\n\u6700\u521d\u505a\u9879\u76ee\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u7684\u662fjsonp\uff0c\u4f46\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\uff0c\u4f7f\u7528get\u8bf7\u6c42\u4e0d\u5b89\u5168\uff0c\u643a\u5e26\u6570\u636e\u8f83\u5c0f\uff0c\u540e\u6765\u4e5f\u7528\u8fc7iframe\uff0c\u4f46\u53ea\u6709\u4e3b\u57df\u76f8\u540c\u624d\u884c\uff0c\u4e5f\u662f\u5b58\u5728\u4e9b\u95ee\u9898\uff0c\u540e\u6765\u901a\u8fc7\u4e86\u89e3\u548c\u5b66\u4e60\u53d1\u73b0\u4f7f\u7528\u4ee3\u7406\u548cproxy\u4ee3\u7406\u914d\u5408\u8d77\u6765\u4f7f\u7528\u6bd4\u8f83\u65b9\u4fbf\uff0c\u5c31\u5f15\u5bfc\u540e\u53f0\u6309\u8fd9\u79cd\u65b9\u5f0f\u505a\u4e0b\u670d\u52a1\u5668\u914d\u7f6e\uff0c\u5728\u5f00\u53d1\u4e2d\u4f7f\u7528proxy\uff0c\u5728\u670d\u52a1\u5668\u4e0a\u4f7f\u7528nginx\u4ee3\u7406\uff0c\u8fd9\u6837\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u5f7c\u6b64\u90fd\u65b9\u4fbf\uff0c\u6548\u7387\u4e5f\u9ad8\uff1b\u73b0\u5728h5\u65b0\u7279\u6027\u8fd8\u6709 windows.postMessage()<\/p>\n

JSONP\uff1a
\najax \u8bf7\u6c42\u53d7\u540c\u6e90\u7b56\u7565\u5f71\u54cd\uff0c\u4e0d\u5141\u8bb8\u8fdb\u884c\u8de8\u57df\u8bf7\u6c42\uff0c\u800c script \u6807\u7b7e src \u5c5e\u6027\u4e2d\u7684\u94fe \u63a5\u5374\u53ef\u4ee5\u8bbf\u95ee\u8de8\u57df\u7684 js \u811a\u672c\uff0c\u5229\u7528\u8fd9\u4e2a\u7279\u6027\uff0c\u670d\u52a1\u7aef\u4e0d\u518d\u8fd4\u56de JSON \u683c\u5f0f\u7684\u6570\u636e\uff0c\u800c\u662f \u8fd4\u56de\u4e00\u6bb5\u8c03\u7528\u67d0\u4e2a\u51fd\u6570\u7684 js \u4ee3\u7801\uff0c\u5728 src \u4e2d\u8fdb\u884c\u4e86\u8c03\u7528\uff0c\u8fd9\u6837\u5b9e\u73b0\u4e86\u8de8\u57df\u3002
\n\u6b65\u9aa4\uff1a<\/p>\n

\u53bb\u521b\u5efa\u4e00\u4e2ascript\u6807\u7b7e
\nscript\u7684src\u5c5e\u6027\u8bbe\u7f6e\u63a5\u53e3\u5730\u5740
\n\u63a5\u53e3\u53c2\u6570\uff0c\u5fc5\u987b\u8981\u5e26\u4e00\u4e2a\u81ea\u5b9a\u4e49\u51fd\u6570\u540d\uff0c\u8981\u4e0d\u7136\u540e\u53f0\u65e0\u6cd5\u8fd4\u56de\u6570\u636e
\n\u901a\u8fc7\u5b9a\u4e49\u51fd\u6570\u540d\u53bb\u63a5\u53d7\u8fd4\u56de\u7684\u6570\u636e<\/p>\n

\/\/\u52a8\u6001\u521b\u5efa script
\nvar script = document.createElement(‘script’);<\/p>\n

\/\/ \u8bbe\u7f6e\u56de\u8c03\u51fd\u6570
\nfunction getData(data) {
\n console.log(data);
\n}<\/p>\n

\/\/\u8bbe\u7f6e script \u7684 src \u5c5e\u6027\uff0c\u5e76\u8bbe\u7f6e\u8bf7\u6c42\u5730\u5740
\nscript.src = ‘http:\/\/localhost:3000\/?callback=getData’;<\/p>\n

\/\/ \u8ba9 script \u751f\u6548
\ndocument.body.appendChild(script);
\n\u590d\u5236\u4ee3\u7801
\nJSONP \u7684\u7f3a\u70b9:
\nJSON \u53ea\u652f\u6301 get\uff0c\u56e0\u4e3a script \u6807\u7b7e\u53ea\u80fd\u4f7f\u7528 get \u8bf7\u6c42\uff1b JSONP \u9700\u8981\u540e\u7aef\u914d\u5408\u8fd4\u56de\u6307\u5b9a\u683c\u5f0f\u7684\u6570\u636e\u3002<\/p>\n

document.domain \u57fa\u7840\u57df\u540d\u76f8\u540c \u5b50\u57df\u540d\u4e0d\u540c<\/p>\n

window.name \u5229\u7528\u5728\u4e00\u4e2a\u6d4f\u89c8\u5668\u7a97\u53e3\u5185\uff0c\u8f7d\u5165\u6240\u6709\u7684\u57df\u540d\u90fd\u662f\u5171\u4eab\u4e00\u4e2awindow.name<\/p>\n

CORS CORS(Cross-origin resource sharing)\u8de8\u57df\u8d44\u6e90\u5171\u4eab \u670d\u52a1\u5668\u8bbe\u7f6e\u5bf9CORS\u7684\u652f\u6301\u539f\u7406\uff1a\u670d\u52a1\u5668\u8bbe\u7f6eAccess-Control-Allow-Origin HTTP\u54cd\u5e94\u5934\u4e4b\u540e\uff0c\u6d4f\u89c8\u5668\u5c06\u4f1a\u5141\u8bb8\u8de8\u57df\u8bf7\u6c42<\/p>\n

proxy\u4ee3\u7406 \u76ee\u524d\u5e38\u7528\u65b9\u5f0f,\u901a\u8fc7\u670d\u52a1\u5668\u8bbe\u7f6e\u4ee3\u7406<\/p>\n

window.postMessage() \u5229\u7528h5\u65b0\u7279\u6027window.postMessage()<\/p>\n

\u8de8\u57df\u4f20\u9001\u95e8 \u261e # \u8de8\u57df\uff0c\u4e0d\u53ef\u4e0d\u77e5\u7684\u57fa\u7840\u6982\u5ff5
\nCookie\u3001sessionStorage\u3001localStorage \u7684\u533a\u522b
\n\u76f8\u540c\u70b9\uff1a<\/p>\n

\u5b58\u50a8\u5728\u5ba2\u6237\u7aef<\/p>\n

\u4e0d\u540c\u70b9\uff1a<\/p>\n

cookie\u6570\u636e\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc74k\uff1bsessionStorage\u548clocalStorage\u7684\u5b58\u50a8\u6bd4cookie\u5927\u5f97\u591a\uff0c\u53ef\u4ee5\u8fbe\u52305M+
\ncookie\u8bbe\u7f6e\u7684\u8fc7\u671f\u65f6\u95f4\u4e4b\u524d\u4e00\u76f4\u6709\u6548\uff1blocalStorage\u6c38\u4e45\u5b58\u50a8\uff0c\u6d4f\u89c8\u5668\u5173\u95ed\u540e\u6570\u636e\u4e0d\u4e22\u5931\u9664\u975e\u4e3b\u52a8\u5220\u9664\u6570\u636e\uff1bsessionStorage\u6570\u636e\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u7a97\u53e3\u5173\u95ed\u540e\u81ea\u52a8\u5220\u9664
\ncookie\u7684\u6570\u636e\u4f1a\u81ea\u52a8\u7684\u4f20\u9012\u5230\u670d\u52a1\u5668\uff1bsessionStorage\u548clocalStorage\u6570\u636e\u4fdd\u5b58\u5728\u672c\u5730<\/p>\n

\u7c98\u5305\u95ee\u9898\u5206\u6790\u4e0e\u5bf9\u7b56
\nTCP\u7c98\u5305\u662f\u6307\u53d1\u9001\u65b9\u53d1\u9001\u7684\u82e5\u5e72\u5305\u6570\u636e\u5230\u63a5\u6536\u65b9\u63a5\u6536\u65f6\u7c98\u6210\u4e00\u5305\uff0c\u4ece\u63a5\u6536\u7f13\u51b2\u533a\u770b\uff0c\u540e\u4e00\u5305\u6570\u636e\u7684\u5934\u7d27\u63a5\u7740\u524d\u4e00\u5305\u6570\u636e\u7684\u5c3e\u3002
\n\u7c98\u5305\u51fa\u73b0\u539f\u56e0
\n\u7b80\u5355\u5f97\u8bf4\uff0c\u5728\u6d41\u4f20\u8f93\u4e2d\u51fa\u73b0\uff0cUDP\u4e0d\u4f1a\u51fa\u73b0\u7c98\u5305\uff0c\u56e0\u4e3a\u5b83\u6709\u6d88\u606f\u8fb9\u754c
\n\u7c98\u5305\u60c5\u51b5\u6709\u4e24\u79cd\uff0c\u4e00\u79cd\u662f\u7c98\u5728\u4e00\u8d77\u7684\u5305\u90fd\u662f\u5b8c\u6574\u7684\u6570\u636e\u5305\uff0c\u53e6\u4e00\u79cd\u60c5\u51b5\u662f\u7c98\u5728\u4e00\u8d77\u7684\u5305\u6709\u4e0d\u5b8c\u6574\u7684\u5305\u3002
\n\u4e3a\u4e86\u907f\u514d\u7c98\u5305\u73b0\u8c61\uff0c\u53ef\u91c7\u53d6\u4ee5\u4e0b\u51e0\u79cd\u63aa\u65bd\uff1a
\n\uff081\uff09\u5bf9\u4e8e\u53d1\u9001\u65b9\u5f15\u8d77\u7684\u7c98\u5305\u73b0\u8c61\uff0c\u7528\u6237\u53ef\u901a\u8fc7\u7f16\u7a0b\u8bbe\u7f6e\u6765\u907f\u514d\uff0cTCP\u63d0\u4f9b\u4e86\u5f3a\u5236\u6570\u636e\u7acb\u5373\u4f20\u9001\u7684\u64cd\u4f5c\u6307\u4ee4push\uff0cTCP\u8f6f\u4ef6\u6536\u5230\u8be5\u64cd\u4f5c\u6307\u4ee4\u540e\uff0c\u5c31\u7acb\u5373\u5c06\u672c\u6bb5\u6570\u636e\u53d1\u9001\u51fa\u53bb\uff0c\u800c\u4e0d\u5fc5\u7b49\u5f85\u53d1\u9001\u7f13\u51b2\u533a\u6ee1\uff1b
\n\uff082\uff09\u5bf9\u4e8e\u63a5\u6536\u65b9\u5f15\u8d77\u7684\u7c98\u5305\uff0c\u5219\u53ef\u901a\u8fc7\u4f18\u5316\u7a0b\u5e8f\u8bbe\u8ba1\u3001\u7cbe\u7b80\u63a5\u6536\u8fdb\u7a0b\u5de5\u4f5c\u91cf\u3001\u63d0\u9ad8\u63a5\u6536\u8fdb\u7a0b\u4f18\u5148\u7ea7\u7b49\u63aa\u65bd\uff0c\u4f7f\u5176\u53ca\u65f6\u63a5\u6536\u6570\u636e\uff0c\u4ece\u800c\u5c3d\u91cf\u907f\u514d\u51fa\u73b0\u7c98\u5305\u73b0\u8c61\uff1b
\n\uff083\uff09\u7531\u63a5\u6536\u65b9\u63a7\u5236\uff0c\u5c06\u4e00\u5305\u6570\u636e\u6309\u7ed3\u6784\u5b57\u6bb5\uff0c\u4eba\u4e3a\u63a7\u5236\u5206\u591a\u6b21\u63a5\u6536\uff0c\u7136\u540e\u5408\u5e76\uff0c\u901a\u8fc7\u8fd9\u79cd\u624b\u6bb5\u6765\u907f\u514d\u7c98\u5305\u3002\u5206\u5305\u591a\u53d1\u3002
\n\u4ee5\u4e0a\u63d0\u5230\u7684\u4e09\u79cd\u63aa\u65bd\uff0c\u90fd\u6709\u5176\u4e0d\u8db3\u4e4b\u5904\u3002
\n\uff081\uff09\u7b2c\u4e00\u79cd\u7f16\u7a0b\u8bbe\u7f6e\u65b9\u6cd5\u867d\u7136\u53ef\u4ee5\u907f\u514d\u53d1\u9001\u65b9\u5f15\u8d77\u7684\u7c98\u5305\uff0c\u4f46\u5b83\u5173\u95ed\u4e86\u4f18\u5316\u7b97\u6cd5\uff0c\u964d\u4f4e\u4e86\u7f51\u7edc\u53d1\u9001\u6548\u7387\uff0c\u5f71\u54cd\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u4e00\u822c\u4e0d\u5efa\u8bae\u4f7f\u7528\u3002
\n\uff082\uff09\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u53ea\u80fd\u51cf\u5c11\u51fa\u73b0\u7c98\u5305\u7684\u53ef\u80fd\u6027\uff0c\u4f46\u5e76\u4e0d\u80fd\u5b8c\u5168\u907f\u514d\u7c98\u5305\uff0c\u5f53\u53d1\u9001\u9891\u7387\u8f83\u9ad8\u65f6\uff0c\u6216\u7531\u4e8e\u7f51\u7edc\u7a81\u53d1\u53ef\u80fd\u4f7f\u67d0\u4e2a\u65f6\u95f4\u6bb5\u6570\u636e\u5305\u5230\u8fbe\u63a5\u6536\u65b9\u8f83\u5feb\uff0c\u63a5\u6536\u65b9\u8fd8\u662f\u6709\u53ef\u80fd\u6765\u4e0d\u53ca\u63a5\u6536\uff0c\u4ece\u800c\u5bfc\u81f4\u7c98\u5305\u3002
\n\uff083\uff09\u7b2c\u4e09\u79cd\u65b9\u6cd5\u867d\u7136\u907f\u514d\u4e86\u7c98\u5305\uff0c\u4f46\u5e94\u7528\u7a0b\u5e8f\u7684\u6548\u7387\u8f83\u4f4e\uff0c\u5bf9\u5b9e\u65f6\u5e94\u7528\u7684\u573a\u5408\u4e0d\u9002\u5408\u3002<\/p>\n

\u4e00\u79cd\u6bd4\u8f83\u5468\u5168\u7684\u5bf9\u7b56\u662f\uff1a\u63a5\u6536\u65b9\u521b\u5efa\u4e00\u9884\u5904\u7406\u7ebf\u7a0b\uff0c\u5bf9\u63a5\u6536\u5230\u7684\u6570\u636e\u5305\u8fdb\u884c\u9884\u5904\u7406\uff0c\u5c06\u7c98\u8fde\u7684\u5305\u5206\u5f00\u3002\u5b9e\u9a8c\u8bc1\u660e\u8fd9\u79cd\u65b9\u6cd5\u662f\u9ad8\u6548\u53ef\u884c\u7684\u3002<\/p>\n

\u6d4f\u89c8\u5668
\n\u4ece\u8f93\u5165URL\u5230\u9875\u9762\u52a0\u8f7d\u7684\u5168\u8fc7\u7a0b<\/p>\n

\u9996\u5148\u5728\u6d4f\u89c8\u5668\u4e2d\u8f93\u5165URL<\/p>\n

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\u6d4f\u89c8\u5668\u7f13\u5b58\uff1a\u6d4f\u89c8\u5668\u4f1a\u8bb0\u5f55DNS\u4e00\u6bb5\u65f6\u95f4\uff0c\u56e0\u6b64\uff0c\u53ea\u662f\u7b2c\u4e00\u4e2a\u5730\u65b9\u89e3\u6790DNS\u8bf7\u6c42\uff1b
\n\u64cd\u4f5c\u7cfb\u7edf\u7f13\u5b58:\u5982\u679c\u5728\u6d4f\u89c8\u5668\u7f13\u5b58\u4e2d\u4e0d\u5305\u542b\u8fd9\u4e2a\u8bb0\u5f55\uff0c\u5219\u4f1a\u4f7f\u7cfb\u7edf\u8c03\u7528\u64cd\u4f5c\u7cfb\u7edf\uff0c \u83b7\u53d6\u64cd\u4f5c\u7cfb\u7edf\u7684\u8bb0\u5f55(\u4fdd\u5b58\u6700\u8fd1\u7684DNS\u67e5\u8be2\u7f13\u5b58)\uff1b
\n\u8def\u7531\u5668\u7f13\u5b58\uff1a\u5982\u679c\u4e0a\u8ff0\u4e24\u4e2a\u6b65\u9aa4\u5747\u4e0d\u80fd\u6210\u529f\u83b7\u53d6DNS\u8bb0\u5f55\uff0c\u7ee7\u7eed\u641c\u7d22\u8def\u7531\u5668\u7f13\u5b58\uff1b
\nISP\u7f13\u5b58\uff1a\u82e5\u4e0a\u8ff0\u5747\u5931\u8d25\uff0c\u7ee7\u7eed\u5411ISP\u641c\u7d22\u3002<\/p>\n

DNS\u57df\u540d\u89e3\u6790\uff1a\u6d4f\u89c8\u5668\u5411DNS\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u89e3\u6790\u8be5URL\u4e2d\u7684\u57df\u540d\u5bf9\u5e94\u7684IP\u5730\u5740\u3002DNS\u670d\u52a1\u5668\u662f\u57fa\u4e8eUDP\u7684\uff0c\u56e0\u6b64\u4f1a\u7528\u5230UDP\u534f\u8bae\u3002<\/p>\n

\u5efa\u7acbTCP\u8fde\u63a5\uff1a\u89e3\u6790\u51faIP\u5730\u5740\u540e\uff0c\u6839\u636eIP\u5730\u5740\u548c\u9ed8\u8ba480\u7aef\u53e3\uff0c\u548c\u670d\u52a1\u5668\u5efa\u7acbTCP\u8fde\u63a5<\/p>\n

\u53d1\u8d77HTTP\u8bf7\u6c42\uff1a\u6d4f\u89c8\u5668\u53d1\u8d77\u8bfb\u53d6\u6587\u4ef6\u7684HTTP\u8bf7\u6c42\uff0c\uff0c\u8be5\u8bf7\u6c42\u62a5\u6587\u4f5c\u4e3aTCP\u4e09\u6b21\u63e1\u624b\u7684\u7b2c\u4e09\u6b21\u6570\u636e\u53d1\u9001\u7ed9\u670d\u52a1\u5668<\/p>\n

\u670d\u52a1\u5668\u54cd\u5e94\u8bf7\u6c42\u5e76\u8fd4\u56de\u7ed3\u679c\uff1a\u670d\u52a1\u5668\u5bf9\u6d4f\u89c8\u5668\u8bf7\u6c42\u505a\u51fa\u54cd\u5e94\uff0c\u5e76\u628a\u5bf9\u5e94\u7684html\u6587\u4ef6\u53d1\u9001\u7ed9\u6d4f\u89c8\u5668<\/p>\n

\u5173\u95edTCP\u8fde\u63a5\uff1a\u901a\u8fc7\u56db\u6b21\u6325\u624b\u91ca\u653eTCP\u8fde\u63a5<\/p>\n

\u6d4f\u89c8\u5668\u6e32\u67d3\uff1a\u5ba2\u6237\u7aef\uff08\u6d4f\u89c8\u5668\uff09\u89e3\u6790HTML\u5185\u5bb9\u5e76\u6e32\u67d3\u51fa\u6765\uff0c\u6d4f\u89c8\u5668\u63a5\u6536\u5230\u6570\u636e\u5305\u540e\u7684\u89e3\u6790\u6d41\u7a0b\u4e3a\uff1a<\/p>\n

\u6784\u5efaDOM\u6811\uff1a\u8bcd\u6cd5\u5206\u6790\u7136\u540e\u89e3\u6790\u6210DOM\u6811\uff08dom tree\uff09\uff0c\u662f\u7531dom\u5143\u7d20\u53ca\u5c5e\u6027\u8282\u70b9\u7ec4\u6210\uff0c\u6811\u7684\u6839\u662fdocument\u5bf9\u8c61
\n\u6784\u5efaCSS\u89c4\u5219\u6811\uff1a\u751f\u6210CSS\u89c4\u5219\u6811\uff08CSS Rule Tree\uff09
\n\u6784\u5efarender\u6811\uff1aWeb\u6d4f\u89c8\u5668\u5c06DOM\u548cCSSOM\u7ed3\u5408\uff0c\u5e76\u6784\u5efa\u51fa\u6e32\u67d3\u6811\uff08render tree\uff09
\n\u5e03\u5c40\uff08Layout\uff09\uff1a\u8ba1\u7b97\u51fa\u6bcf\u4e2a\u8282\u70b9\u5728\u5c4f\u5e55\u4e2d\u7684\u4f4d\u7f6e
\n\u7ed8\u5236\uff08Painting\uff09\uff1a\u5373\u904d\u5386render\u6811\uff0c\u5e76\u4f7f\u7528UI\u540e\u7aef\u5c42\u7ed8\u5236\u6bcf\u4e2a\u8282\u70b9\u3002<\/p>\n

JS\u5f15\u64ce\u89e3\u6790\u8fc7\u7a0b\uff1a\u8c03\u7528JS\u5f15\u64ce\u6267\u884cJS\u4ee3\u7801\uff08JS\u7684\u89e3\u91ca\u9636\u6bb5\uff0c\u9884\u5904\u7406\u9636\u6bb5\uff0c\u6267\u884c\u9636\u6bb5\u751f\u6210\u6267\u884c\u4e0a\u4e0b\u6587\uff0cVO\uff0c\u4f5c\u7528\u57df\u94fe\u3001\u56de\u6536\u673a\u5236\u7b49\u7b49\uff09<\/p>\n

\u521b\u5efawindow\u5bf9\u8c61\uff1awindow\u5bf9\u8c61\u4e5f\u53eb\u5168\u5c40\u6267\u884c\u73af\u5883\uff0c\u5f53\u9875\u9762\u4ea7\u751f\u65f6\u5c31\u88ab\u521b\u5efa\uff0c\u6240\u6709\u7684\u5168\u5c40\u53d8\u91cf\u548c\u51fd\u6570\u90fd\u5c5e\u4e8ewindow\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u800cDOM Tree\u4e5f\u4f1a\u6620\u5c04\u5728window\u7684doucment\u5bf9\u8c61\u4e0a\u3002\u5f53\u5173\u95ed\u7f51\u9875\u6216\u8005\u5173\u95ed\u6d4f\u89c8\u5668\u65f6\uff0c\u5168\u5c40\u6267\u884c\u73af\u5883\u4f1a\u88ab\u9500\u6bc1\u3002
\n\u52a0\u8f7d\u6587\u4ef6\uff1a\u5b8c\u6210js\u5f15\u64ce\u5206\u6790\u5b83\u7684\u8bed\u6cd5\u4e0e\u8bcd\u6cd5\u662f\u5426\u5408\u6cd5\uff0c\u5982\u679c\u5408\u6cd5\u8fdb\u5165\u9884\u7f16\u8bd1
\n\u9884\u7f16\u8bd1\uff1a\u5728\u9884\u7f16\u8bd1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6d4f\u89c8\u5668\u4f1a\u5bfb\u627e\u5168\u5c40\u53d8\u91cf\u58f0\u660e\uff0c\u628a\u5b83\u4f5c\u4e3awindow\u7684\u5c5e\u6027\u52a0\u5165\u5230window\u5bf9\u8c61\u4e2d\uff0c\u5e76\u7ed9\u53d8\u91cf\u8d4b\u503c\u4e3a’undefined’\uff1b\u5bfb\u627e\u5168\u5c40\u51fd\u6570\u58f0\u660e\uff0c\u628a\u5b83\u4f5c\u4e3awindow\u7684\u65b9\u6cd5\u52a0\u5165\u5230window\u5bf9\u8c61\u4e2d\uff0c\u5e76\u5c06\u51fd\u6570\u4f53\u8d4b\u503c\u7ed9\u4ed6\uff08\u533f\u540d\u51fd\u6570\u662f\u4e0d\u53c2\u4e0e\u9884\u7f16\u8bd1\u7684\uff0c\u56e0\u4e3a\u5b83\u662f\u53d8\u91cf\uff09\u3002\u800c\u53d8\u91cf\u63d0\u5347\u4f5c\u4e3a\u4e0d\u5408\u7406\u7684\u5730\u65b9\u5728ES6\u4e2d\u5df2\u7ecf\u89e3\u51b3\u4e86\uff0c\u51fd\u6570\u63d0\u5347\u8fd8\u5b58\u5728\u3002
\n\u89e3\u91ca\u6267\u884c\uff1a\u6267\u884c\u5230\u53d8\u91cf\u5c31\u8d4b\u503c\uff0c\u5982\u679c\u53d8\u91cf\u6ca1\u6709\u88ab\u5b9a\u4e49\uff0c\u4e5f\u5c31\u6ca1\u6709\u88ab\u9884\u7f16\u8bd1\u76f4\u63a5\u8d4b\u503c\uff0c\u5728ES5\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\u8fd9\u4e2a\u53d8\u91cf\u4f1a\u6210\u4e3awindow\u7684\u4e00\u4e2a\u5c5e\u6027\uff0c\u4e5f\u5c31\u662f\u6210\u4e3a\u5168\u5c40\u53d8\u91cf\u3002string\u3001int\u8fd9\u6837\u7684\u503c\u5c31\u662f\u76f4\u63a5\u628a\u503c\u653e\u5728\u53d8\u91cf\u7684\u5b58\u50a8\u7a7a\u95f4\u91cc\uff0cobject\u5bf9\u8c61\u5c31\u662f\u628a\u6307\u9488\u6307\u5411\u53d8\u91cf\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u51fd\u6570\u6267\u884c\uff0c\u5c31\u5c06\u51fd\u6570\u7684\u73af\u5883\u63a8\u5165\u4e00\u4e2a\u73af\u5883\u7684\u6808\u4e2d\uff0c\u6267\u884c\u5b8c\u6210\u540e\u518d\u5f39\u51fa\uff0c\u63a7\u5236\u6743\u4ea4\u8fd8\u7ed9\u4e4b\u524d\u7684\u73af\u5883\u3002JS\u4f5c\u7528\u57df\u5176\u5b9e\u5c31\u662f\u8fd9\u6837\u7684\u6267\u884c\u6d41\u673a\u5236\u5b9e\u73b0\u7684\u3002<\/p>\n

\u4f20\u9001\u95e8 \u261e # DNS\u57df\u540d\u89e3\u6790\u8fc7\u7a0b \u261e# \u6d4f\u89c8\u5668\u7684\u5de5\u4f5c\u539f\u7406
\n\u6d4f\u89c8\u5668\u91cd\u7ed8\u4e0e\u91cd\u6392\u7684\u533a\u522b\uff1f<\/p>\n

\u91cd\u6392\/\u56de\u6d41\uff08Reflow\uff09\uff1a\u5f53DOM\u7684\u53d8\u5316\u5f71\u54cd\u4e86\u5143\u7d20\u7684\u51e0\u4f55\u4fe1\u606f\uff0c\u6d4f\u89c8\u5668\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\u5143\u7d20\u7684\u51e0\u4f55\u5c5e\u6027\uff0c\u5c06\u5176\u5b89\u653e\u5728\u754c\u9762\u4e2d\u7684\u6b63\u786e\u4f4d\u7f6e\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u53eb\u505a\u91cd\u6392\u3002\u8868\u73b0\u4e3a\u91cd\u65b0\u751f\u6210\u5e03\u5c40\uff0c\u91cd\u65b0\u6392\u5217\u5143\u7d20\u3002
\n\u91cd\u7ed8(Repaint): \u5f53\u4e00\u4e2a\u5143\u7d20\u7684\u5916\u89c2\u53d1\u751f\u6539\u53d8\uff0c\u4f46\u6ca1\u6709\u6539\u53d8\u5e03\u5c40,\u91cd\u65b0\u628a\u5143\u7d20\u5916\u89c2\u7ed8\u5236\u51fa\u6765\u7684\u8fc7\u7a0b\uff0c\u53eb\u505a\u91cd\u7ed8\u3002\u8868\u73b0\u4e3a\u67d0\u4e9b\u5143\u7d20\u7684\u5916\u89c2\u88ab\u6539\u53d8<\/p>\n

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\n\u91cd\u6392\u548c\u91cd\u7ed8\u4ee3\u4ef7\u662f\u9ad8\u6602\u7684\uff0c\u5b83\u4eec\u4f1a\u7834\u574f\u7528\u6237\u4f53\u9a8c\uff0c\u5e76\u4e14\u8ba9UI\u5c55\u793a\u975e\u5e38\u8fdf\u7f13\uff0c\u800c\u76f8\u6bd4\u4e4b\u4e0b\u91cd\u6392\u7684\u6027\u80fd\u5f71\u54cd\u66f4\u5927\uff0c\u5728\u4e24\u8005\u65e0\u6cd5\u907f\u514d\u7684\u60c5\u51b5\u4e0b\uff0c\u4e00\u822c\u6211\u4eec\u5b81\u53ef\u9009\u62e9\u4ee3\u4ef7\u66f4\u5c0f\u7684\u91cd\u7ed8\u3002
\n\u300e\u91cd\u7ed8\u300f\u4e0d\u4e00\u5b9a\u4f1a\u51fa\u73b0\u300e\u91cd\u6392\u300f\uff0c\u300e\u91cd\u6392\u300f\u5fc5\u7136\u4f1a\u51fa\u73b0\u300e\u91cd\u7ed8\u300f\u3002
\n\u5982\u4f55\u89e6\u53d1\u91cd\u6392\u548c\u91cd\u7ed8\uff1f
\n\u4efb\u4f55\u6539\u53d8\u7528\u6765\u6784\u5efa\u6e32\u67d3\u6811\u7684\u4fe1\u606f\u90fd\u4f1a\u5bfc\u81f4\u4e00\u6b21\u91cd\u6392\u6216\u91cd\u7ed8\uff1a<\/p>\n

\u6dfb\u52a0\u3001\u5220\u9664\u3001\u66f4\u65b0DOM\u8282\u70b9
\n\u901a\u8fc7display: none\u9690\u85cf\u4e00\u4e2aDOM\u8282\u70b9-\u89e6\u53d1\u91cd\u6392\u548c\u91cd\u7ed8
\n\u901a\u8fc7visibility: hidden\u9690\u85cf\u4e00\u4e2aDOM\u8282\u70b9-\u53ea\u89e6\u53d1\u91cd\u7ed8\uff0c\u56e0\u4e3a\u6ca1\u6709\u51e0\u4f55\u53d8\u5316
\n\u79fb\u52a8\u6216\u8005\u7ed9\u9875\u9762\u4e2d\u7684DOM\u8282\u70b9\u6dfb\u52a0\u52a8\u753b
\n\u6dfb\u52a0\u4e00\u4e2a\u6837\u5f0f\u8868\uff0c\u8c03\u6574\u6837\u5f0f\u5c5e\u6027
\n\u7528\u6237\u884c\u4e3a\uff0c\u4f8b\u5982\u8c03\u6574\u7a97\u53e3\u5927\u5c0f\uff0c\u6539\u53d8\u5b57\u53f7\uff0c\u6216\u8005\u6eda\u52a8\u3002<\/p>\n

\u5982\u4f55\u907f\u514d\u91cd\u7ed8\u6216\u8005\u91cd\u6392\uff1f<\/p>\n

\u96c6\u4e2d\u6539\u53d8\u6837\u5f0f\uff0c\u4e0d\u8981\u4e00\u6761\u4e00\u6761\u5730\u4fee\u6539 DOM \u7684\u6837\u5f0f\u3002<\/p>\n

\u4e0d\u8981\u628a DOM \u7ed3\u70b9\u7684\u5c5e\u6027\u503c\u653e\u5728\u5faa\u73af\u91cc\u5f53\u6210\u5faa\u73af\u91cc\u7684\u53d8\u91cf\u3002<\/p>\n

\u4e3a\u52a8\u753b\u7684 HTML \u5143\u4ef6\u4f7f\u7528 fixed \u6216 absoult \u7684 position\uff0c\u90a3\u4e48\u4fee\u6539\u4ed6\u4eec\u7684 CSS \u662f\u4e0d\u4f1a reflow \u7684\u3002<\/p>\n

\u4e0d\u4f7f\u7528 table \u5e03\u5c40\u3002\u56e0\u4e3a\u53ef\u80fd\u5f88\u5c0f\u7684\u4e00\u4e2a\u5c0f\u6539\u52a8\u4f1a\u9020\u6210\u6574\u4e2a table \u7684\u91cd\u65b0\u5e03\u5c40\u3002<\/p>\n

\u5c3d\u91cf\u53ea\u4fee\u6539position\uff1aabsolute\u6216fixed\u5143\u7d20\uff0c\u5bf9\u5176\u4ed6\u5143\u7d20\u5f71\u54cd\u4e0d\u5927<\/p>\n

\u52a8\u753b\u5f00\u59cbGPU\u52a0\u901f\uff0ctranslate\u4f7f\u75283D\u53d8\u5316<\/p>\n

\u63d0\u5347\u4e3a\u5408\u6210\u5c42
\n\u5c06\u5143\u7d20\u63d0\u5347\u4e3a\u5408\u6210\u5c42\u6709\u4ee5\u4e0b\u4f18\u70b9\uff1a<\/p>\n

\u5408\u6210\u5c42\u7684\u4f4d\u56fe\uff0c\u4f1a\u4ea4\u7531 GPU \u5408\u6210\uff0c\u6bd4 CPU \u5904\u7406\u8981\u5feb
\n\u5f53\u9700\u8981 repaint \u65f6\uff0c\u53ea\u9700\u8981 repaint \u672c\u8eab\uff0c\u4e0d\u4f1a\u5f71\u54cd\u5230\u5176\u4ed6\u7684\u5c42
\n\u5bf9\u4e8e transform \u548c opacity \u6548\u679c\uff0c\u4e0d\u4f1a\u89e6\u53d1 layout \u548c paint<\/p>\n

\u63d0\u5347\u5408\u6210\u5c42\u7684\u6700\u597d\u65b9\u5f0f\u662f\u4f7f\u7528 CSS \u7684 will-change \u5c5e\u6027\uff1a
\n#target {
\n will-change: transform;
\n}
\n\u590d\u5236\u4ee3\u7801<\/p>\n

\u5173\u4e8e\u5408\u6210\u5c42\u7684\u8be6\u89e3\u8bf7\u79fb\u6b65\u65e0\u7ebf\u6027\u80fd\u4f18\u5316\uff1aComposite<\/p>\n

\u4ecb\u7ecd\u4e0b304\u8fc7\u7a0b<\/p>\n

a. \u6d4f\u89c8\u5668\u8bf7\u6c42\u8d44\u6e90\u65f6\u9996\u5148\u547d\u4e2d\u8d44\u6e90\u7684Expires \u548c Cache-Control\uff0cExpires \u53d7\u9650\u4e8e\u672c\u5730\u65f6\u95f4\uff0c\u5982\u679c\u4fee\u6539\u4e86\u672c\u5730\u65f6\u95f4\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u7f13\u5b58\u5931\u6548\uff0c\u53ef\u4ee5\u901a\u8fc7Cache-control: max-age\u6307\u5b9a\u6700\u5927\u751f\u547d\u5468\u671f\uff0c\u72b6\u6001\u4ecd\u7136\u8fd4\u56de200\uff0c\u4f46\u4e0d\u4f1a\u8bf7\u6c42\u6570\u636e\uff0c\u5728\u6d4f\u89c8\u5668\u4e2d\u80fd\u660e\u663e\u770b\u5230from cache\u5b57\u6837\u3002
\nb. \u5f3a\u7f13\u5b58\u5931\u6548\uff0c\u8fdb\u5165\u534f\u5546\u7f13\u5b58\u9636\u6bb5\uff0c\u9996\u5148\u9a8c\u8bc1ETagETag\u53ef\u4ee5\u4fdd\u8bc1\u6bcf\u4e00\u4e2a\u8d44\u6e90\u662f\u552f\u4e00\u7684\uff0c\u8d44\u6e90\u53d8\u5316\u90fd\u4f1a\u5bfc\u81f4ETag\u53d8\u5316\u3002\u670d\u52a1\u5668\u6839\u636e\u5ba2\u6237\u7aef\u4e0a\u9001\u7684If-None-Match\u503c\u6765\u5224\u65ad\u662f\u5426\u547d\u4e2d\u7f13\u5b58\u3002
\nc. \u534f\u5546\u7f13\u5b58Last-Modify\/If-Modify-Since\u9636\u6bb5\uff0c\u5ba2\u6237\u7aef\u7b2c\u4e00\u6b21\u8bf7\u6c42\u8d44\u6e90\u65f6\uff0c\u670d\u52a1\u670d\u8fd4\u56de\u7684header\u4e2d\u4f1a\u52a0\u4e0aLast-Modify\uff0cLast-modify\u662f\u4e00\u4e2a\u65f6\u95f4\u6807\u8bc6\u8be5\u8d44\u6e90\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u3002\u518d\u6b21\u8bf7\u6c42\u8be5\u8d44\u6e90\u65f6\uff0crequest\u7684\u8bf7\u6c42\u5934\u4e2d\u4f1a\u5305\u542bIf-Modify-Since\uff0c\u8be5\u503c\u4e3a\u7f13\u5b58\u4e4b\u524d\u8fd4\u56de\u7684Last-Modify\u3002\u670d\u52a1\u5668\u6536\u5230If-Modify-Since\u540e\uff0c\u6839\u636e\u8d44\u6e90\u7684\u6700\u540e\u4fee\u6539\u65f6\u95f4\u5224\u65ad\u662f\u5426\u547d\u4e2d\u7f13\u5b58\u3002<\/p>\n

\u6d4f\u89c8\u5668\u7684\u7f13\u5b58\u673a\u5236 \u5f3a\u5236\u7f13\u5b58 && \u534f\u5546\u7f13\u5b58
\n\u6d4f\u89c8\u5668\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\u7684\u65b9\u5f0f\u4e3a\u5e94\u7b54\u6a21\u5f0f\uff0c\u5373\u662f\uff1a\u6d4f\u89c8\u5668\u53d1\u8d77HTTP\u8bf7\u6c42 \u2013 \u670d\u52a1\u5668\u54cd\u5e94\u8be5\u8bf7\u6c42\u3002\u90a3\u4e48\u6d4f\u89c8\u5668\u7b2c\u4e00\u6b21\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8be5\u8bf7\u6c42\u540e\u62ff\u5230\u8bf7\u6c42\u7ed3\u679c\uff0c\u4f1a\u6839\u636e\u54cd\u5e94\u62a5\u6587\u4e2dHTTP\u5934\u7684\u7f13\u5b58\u6807\u8bc6\uff0c\u51b3\u5b9a\u662f\u5426\u7f13\u5b58\u7ed3\u679c\uff0c\u662f\u5219\u5c06\u8bf7\u6c42\u7ed3\u679c\u548c\u7f13\u5b58\u6807\u8bc6\u5b58\u5165\u6d4f\u89c8\u5668\u7f13\u5b58\u4e2d\uff0c\u7b80\u5355\u7684\u8fc7\u7a0b\u5982\u4e0b\u56fe\uff1a<\/p>\n

\u7531\u4e0a\u56fe\u6211\u4eec\u53ef\u4ee5\u77e5\u9053\uff1a<\/p>\n

\u6d4f\u89c8\u5668\u6bcf\u6b21\u53d1\u8d77\u8bf7\u6c42\uff0c\u90fd\u4f1a\u5148\u5728\u6d4f\u89c8\u5668\u7f13\u5b58\u4e2d\u67e5\u627e\u8be5\u8bf7\u6c42\u7684\u7ed3\u679c\u4ee5\u53ca\u7f13\u5b58\u6807\u8bc6
\n\u6d4f\u89c8\u5668\u6bcf\u6b21\u62ff\u5230\u8fd4\u56de\u7684\u8bf7\u6c42\u7ed3\u679c\u90fd\u4f1a\u5c06\u8be5\u7ed3\u679c\u548c\u7f13\u5b58\u6807\u8bc6\u5b58\u5165\u6d4f\u89c8\u5668\u7f13\u5b58\u4e2d<\/p>\n

\u4ee5\u4e0a\u4e24\u70b9\u7ed3\u8bba\u5c31\u662f\u6d4f\u89c8\u5668\u7f13\u5b58\u673a\u5236\u7684\u5173\u952e\uff0c\u4ed6\u786e\u4fdd\u4e86\u6bcf\u4e2a\u8bf7\u6c42\u7684\u7f13\u5b58\u5b58\u5165\u4e0e\u8bfb\u53d6\uff0c\u53ea\u8981\u6211\u4eec\u518d\u7406\u89e3\u6d4f\u89c8\u5668\u7f13\u5b58\u7684\u4f7f\u7528\u89c4\u5219\uff0c\u90a3\u4e48\u6240\u6709\u7684\u95ee\u9898\u5c31\u8fce\u5203\u800c\u89e3\u4e86\u3002\u4e3a\u4e86\u65b9\u4fbf\u7406\u89e3\uff0c\u8fd9\u91cc\u6839\u636e\u662f\u5426\u9700\u8981\u5411\u670d\u52a1\u5668\u91cd\u65b0\u53d1\u8d77HTTP\u8bf7\u6c42\u5c06\u7f13\u5b58\u8fc7\u7a0b\u5206\u4e3a\u4e24\u4e2a\u90e8\u5206\uff0c\u5206\u522b\u662f\u5f3a\u5236\u7f13\u5b58\u548c\u534f\u5546\u7f13\u5b58\u3002<\/p>\n

\u5f3a\u5236\u7f13\u5b58
\n\u5f3a\u5236\u7f13\u5b58\u5c31\u662f\u5411\u6d4f\u89c8\u5668\u7f13\u5b58\u67e5\u627e\u8be5\u8bf7\u6c42\u7ed3\u679c\uff0c\u5e76\u6839\u636e\u8be5\u7ed3\u679c\u7684\u7f13\u5b58\u89c4\u5219\u6765\u51b3\u5b9a\u662f\u5426\u4f7f\u7528\u8be5\u7f13\u5b58\u7ed3\u679c\u7684\u8fc7\u7a0b\u3002\u5f53\u6d4f\u89c8\u5668\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\u65f6\uff0c\u670d\u52a1\u5668\u4f1a\u5c06\u7f13\u5b58\u89c4\u5219\u653e\u5165HTTP\u54cd\u5e94\u62a5\u6587\u7684HTTP\u5934\u4e2d\u548c\u8bf7\u6c42\u7ed3\u679c\u4e00\u8d77\u8fd4\u56de\u7ed9\u6d4f\u89c8\u5668\uff0c\u63a7\u5236\u5f3a\u5236\u7f13\u5b58\u7684\u5b57\u6bb5\u5206\u522b\u662f Expires \u548c Cache-Control\uff0c\u5176\u4e2dCache-Control\u4f18\u5148\u7ea7\u6bd4Expires\u9ad8\u3002
\n\u5f3a\u5236\u7f13\u5b58\u7684\u60c5\u51b5\u4e3b\u8981\u6709\u4e09\u79cd(\u6682\u4e0d\u5206\u6790\u534f\u5546\u7f13\u5b58\u8fc7\u7a0b)\uff0c\u5982\u4e0b\uff1a<\/p>\n

\u4e0d\u5b58\u5728\u8be5\u7f13\u5b58\u7ed3\u679c\u548c\u7f13\u5b58\u6807\u8bc6\uff0c\u5f3a\u5236\u7f13\u5b58\u5931\u6548\uff0c\u5219\u76f4\u63a5\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\uff08\u8ddf\u7b2c\u4e00\u6b21\u53d1\u8d77\u8bf7\u6c42\u4e00\u81f4\uff09\u3002
\n\u5b58\u5728\u8be5\u7f13\u5b58\u7ed3\u679c\u548c\u7f13\u5b58\u6807\u8bc6\uff0c\u4f46\u8be5\u7ed3\u679c\u5df2\u5931\u6548\uff0c\u5f3a\u5236\u7f13\u5b58\u5931\u6548\uff0c\u5219\u4f7f\u7528\u534f\u5546\u7f13\u5b58\u3002
\n\u5b58\u5728\u8be5\u7f13\u5b58\u7ed3\u679c\u548c\u7f13\u5b58\u6807\u8bc6\uff0c\u4e14\u8be5\u7ed3\u679c\u5c1a\u672a\u5931\u6548\uff0c\u5f3a\u5236\u7f13\u5b58\u751f\u6548\uff0c\u76f4\u63a5\u8fd4\u56de\u8be5\u7ed3\u679c<\/p>\n

\u534f\u5546\u7f13\u5b58
\n\u534f\u5546\u7f13\u5b58\u5c31\u662f\u5f3a\u5236\u7f13\u5b58\u5931\u6548\u540e\uff0c\u6d4f\u89c8\u5668\u643a\u5e26\u7f13\u5b58\u6807\u8bc6\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u7531\u670d\u52a1\u5668\u6839\u636e\u7f13\u5b58\u6807\u8bc6\u51b3\u5b9a\u662f\u5426\u4f7f\u7528\u7f13\u5b58\u7684\u8fc7\u7a0b\uff0c\u540c\u6837\uff0c\u534f\u5546\u7f13\u5b58\u7684\u6807\u8bc6\u4e5f\u662f\u5728\u54cd\u5e94\u62a5\u6587\u7684HTTP\u5934\u4e2d\u548c\u8bf7\u6c42\u7ed3\u679c\u4e00\u8d77\u8fd4\u56de\u7ed9\u6d4f\u89c8\u5668\u7684\uff0c\u63a7\u5236\u534f\u5546\u7f13\u5b58\u7684\u5b57\u6bb5\u5206\u522b\u6709\uff1aLast-Modified \/ If-Modified-Since \u548c Etag \/ If-None-Match\uff0c\u5176\u4e2dEtag \/ If-None-Match\u7684\u4f18\u5148\u7ea7\u6bd4Last-Modified \/ If-Modified-Since\u9ad8\u3002\u534f\u5546\u7f13\u5b58\u4e3b\u8981\u6709\u4ee5\u4e0b\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n

\u534f\u5546\u7f13\u5b58\u751f\u6548\uff0c\u8fd4\u56de304
\n\u534f\u5546\u7f13\u5b58\u5931\u6548\uff0c\u8fd4\u56de200\u548c\u8bf7\u6c42\u7ed3\u679c\u7ed3\u679c<\/p>\n

\u4f20\u9001\u95e8 \u261e # \u5f7b\u5e95\u7406\u89e3\u6d4f\u89c8\u5668\u7684\u7f13\u5b58\u673a\u5236
\n\u8bf4\u4e0b\u8fdb\u7a0b\u3001\u7ebf\u7a0b\u548c\u534f\u7a0b
\n\u8fdb\u7a0b\u662f\u4e00\u4e2a\u5177\u6709\u4e00\u5b9a\u72ec\u7acb\u529f\u80fd\u7684\u7a0b\u5e8f\u5728\u4e00\u4e2a\u6570\u636e\u96c6\u4e0a\u7684\u4e00\u6b21\u52a8\u6001\u6267\u884c\u7684\u8fc7\u7a0b\uff0c\u662f\u64cd\u4f5c\u7cfb\u7edf\u8fdb\u884c\u8d44\u6e90\u5206\u914d\u548c\u8c03\u5ea6\u7684\u4e00\u4e2a\u72ec\u7acb\u5355\u4f4d\uff0c\u662f\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u7684\u8f7d\u4f53\u3002\u8fdb\u7a0b\u662f\u4e00\u79cd\u62bd\u8c61\u7684\u6982\u5ff5\uff0c\u4ece\u6765\u6ca1\u6709\u7edf\u4e00\u7684\u6807\u51c6\u5b9a\u4e49\u3002
\n\u7ebf\u7a0b\u662f\u7a0b\u5e8f\u6267\u884c\u4e2d\u4e00\u4e2a\u5355\u4e00\u7684\u987a\u5e8f\u63a7\u5236\u6d41\u7a0b\uff0c\u662f\u7a0b\u5e8f\u6267\u884c\u6d41\u7684\u6700\u5c0f\u5355\u5143\uff0c\u662f\u5904\u7406\u5668\u8c03\u5ea6\u548c\u5206\u6d3e\u7684\u57fa\u672c\u5355\u4f4d\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u7ebf\u7a0b\uff0c\u5404\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5171\u4eab\u7a0b\u5e8f\u7684\u5185\u5b58\u7a7a\u95f4(\u4e5f\u5c31\u662f\u6240\u5728\u8fdb\u7a0b\u7684\u5185\u5b58\u7a7a\u95f4)\u3002\u4e00\u4e2a\u6807\u51c6\u7684\u7ebf\u7a0b\u7531\u7ebf\u7a0bID\u3001\u5f53\u524d\u6307\u4ee4\u6307\u9488(PC)\u3001\u5bc4\u5b58\u5668\u548c\u5806\u6808\u7ec4\u6210\u3002\u800c\u8fdb\u7a0b\u7531\u5185\u5b58\u7a7a\u95f4(\u4ee3\u7801\u3001\u6570\u636e\u3001\u8fdb\u7a0b\u7a7a\u95f4\u3001\u6253\u5f00\u7684\u6587\u4ef6)\u548c\u4e00\u4e2a\u6216\u591a\u4e2a\u7ebf\u7a0b\u7ec4\u6210\u3002
\n\u534f\u7a0b\uff0c\u82f1\u6587Coroutines\uff0c\u662f\u4e00\u79cd\u57fa\u4e8e\u7ebf\u7a0b\u4e4b\u4e0a\uff0c\u4f46\u53c8\u6bd4\u7ebf\u7a0b\u66f4\u52a0\u8f7b\u91cf\u7ea7\u7684\u5b58\u5728\uff0c\u8fd9\u79cd\u7531\u7a0b\u5e8f\u5458\u81ea\u5df1\u5199\u7a0b\u5e8f\u6765\u7ba1\u7406\u7684\u8f7b\u91cf\u7ea7\u7ebf\u7a0b\u53eb\u505a\u300e\u7528\u6237\u7a7a\u95f4\u7ebf\u7a0b\u300f\uff0c\u5177\u6709\u5bf9\u5185\u6838\u6765\u8bf4\u4e0d\u53ef\u89c1\u7684\u7279\u6027\u3002
\n\u8fdb\u7a0b\u548c\u7ebf\u7a0b\u7684\u533a\u522b\u4e0e\u8054\u7cfb
\n\u3010\u533a\u522b\u3011\uff1a
\n\u8c03\u5ea6\uff1a\u7ebf\u7a0b\u4f5c\u4e3a\u8c03\u5ea6\u548c\u5206\u914d\u7684\u57fa\u672c\u5355\u4f4d\uff0c\u8fdb\u7a0b\u4f5c\u4e3a\u62e5\u6709\u8d44\u6e90\u7684\u57fa\u672c\u5355\u4f4d\uff1b
\n\u5e76\u53d1\u6027\uff1a\u4e0d\u4ec5\u8fdb\u7a0b\u4e4b\u95f4\u53ef\u4ee5\u5e76\u53d1\u6267\u884c\uff0c\u540c\u4e00\u4e2a\u8fdb\u7a0b\u7684\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u4e5f\u53ef\u5e76\u53d1\u6267\u884c\uff1b
\n\u62e5\u6709\u8d44\u6e90\uff1a\u8fdb\u7a0b\u662f\u62e5\u6709\u8d44\u6e90\u7684\u4e00\u4e2a\u72ec\u7acb\u5355\u4f4d\uff0c\u7ebf\u7a0b\u4e0d\u62e5\u6709\u7cfb\u7edf\u8d44\u6e90\uff0c\u4f46\u53ef\u4ee5\u8bbf\u95ee\u96b6\u5c5e\u4e8e\u8fdb\u7a0b\u7684\u8d44\u6e90\u3002
\n\u7cfb\u7edf\u5f00\u9500\uff1a\u5728\u521b\u5efa\u6216\u64a4\u6d88\u8fdb\u7a0b\u65f6\uff0c\u7531\u4e8e\u7cfb\u7edf\u90fd\u8981\u4e3a\u4e4b\u5206\u914d\u548c\u56de\u6536\u8d44\u6e90\uff0c\u5bfc\u81f4\u7cfb\u7edf\u7684\u5f00\u9500\u660e\u663e\u5927\u4e8e\u521b\u5efa\u6216\u64a4\u6d88\u7ebf\u7a0b\u65f6\u7684\u5f00\u9500\u3002\u4f46\u662f\u8fdb\u7a0b\u6709\u72ec\u7acb\u7684\u5730\u5740\u7a7a\u95f4\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u5d29\u6e83\u540e\uff0c\u5728\u4fdd\u62a4\u6a21\u5f0f\u4e0b\u4e0d\u4f1a\u5bf9\u5176\u5b83\u8fdb\u7a0b\u4ea7\u751f\u5f71\u54cd\uff0c\u800c\u7ebf\u7a0b\u53ea\u662f\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u7684\u4e0d\u540c\u6267\u884c\u8def\u5f84\u3002\u7ebf\u7a0b\u6709\u81ea\u5df1\u7684\u5806\u6808\u548c\u5c40\u90e8\u53d8\u91cf\uff0c\u4f46\u7ebf\u7a0b\u4e4b\u95f4\u6ca1\u6709\u5355\u72ec\u7684\u5730\u5740\u7a7a\u95f4\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u6b7b\u6389\u5c31\u7b49\u4e8e\u6240\u6709\u7684\u7ebf\u7a0b\u6b7b\u6389\uff0c\u6240\u4ee5\u591a\u8fdb\u7a0b\u7684\u7a0b\u5e8f\u8981\u6bd4\u591a\u7ebf\u7a0b\u7684\u7a0b\u5e8f\u5065\u58ee\uff0c\u4f46\u5728\u8fdb\u7a0b\u5207\u6362\u65f6\uff0c\u8017\u8d39\u8d44\u6e90\u8f83\u5927\uff0c\u6548\u7387\u8981\u5dee\u4e00\u4e9b\u3002
\n\u3010\u8054\u7cfb\u3011\uff1a
\n\u4e00\u4e2a\u7ebf\u7a0b\u53ea\u80fd\u5c5e\u4e8e\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u800c\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u6709\u591a\u4e2a\u7ebf\u7a0b\uff0c\u4f46\u81f3\u5c11\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff1b
\n\u8d44\u6e90\u5206\u914d\u7ed9\u8fdb\u7a0b\uff0c\u540c\u4e00\u8fdb\u7a0b\u7684\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u8be5\u8fdb\u7a0b\u7684\u6240\u6709\u8d44\u6e90\uff1b
\n\u5904\u7406\u673a\u5206\u7ed9\u7ebf\u7a0b\uff0c\u5373\u771f\u6b63\u5728\u5904\u7406\u673a\u4e0a\u8fd0\u884c\u7684\u662f\u7ebf\u7a0b\uff1b
\n\u7ebf\u7a0b\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u534f\u4f5c\u540c\u6b65\u3002\u4e0d\u540c\u8fdb\u7a0b\u7684\u7ebf\u7a0b\u95f4\u8981\u5229\u7528\u6d88\u606f\u901a\u4fe1\u7684\u529e\u6cd5\u5b9e\u73b0\u540c\u6b65\u3002
\n\u4f20\u9001\u95e8 \u261e # \u4e00\u6587\u641e\u61c2\u8fdb\u7a0b\u3001\u7ebf\u7a0b\u3001\u534f\u7a0b\u53caJS\u534f\u7a0b\u7684\u53d1\u5c55
\n\u261e\u4e86\u89e3\u66f4\u591a
\n\u5173\u4e8e\u6d4f\u89c8\u5668\u4f20\u9001\u95e8 \u261e# \u6df1\u5165\u4e86\u89e3\u73b0\u4ee3 Web \u6d4f\u89c8\u5668
\nHTML && CSS
\nHTML5 \u65b0\u7279\u6027\u3001\u8bed\u4e49\u5316<\/p>\n

\u6982\u5ff5\uff1a
\nHTML5\u7684\u8bed\u4e49\u5316\u6307\u7684\u662f\u5408\u7406\u6b63\u786e\u7684\u4f7f\u7528\u8bed\u4e49\u5316\u7684\u6807\u7b7e\u6765\u521b\u5efa\u9875\u9762\u7ed3\u6784\u3002\u3010\u6b63\u786e\u7684\u6807\u7b7e\u505a\u6b63\u786e\u7684\u4e8b\u3011<\/p>\n

\u8bed\u4e49\u5316\u6807\u7b7e\uff1a
\nheader nav main article section aside footer<\/p>\n

\u8bed\u4e49\u5316\u7684\u4f18\u70b9:<\/p>\n

\u5728\u6ca1CSS\u6837\u5f0f\u7684\u60c5\u51b5\u4e0b\uff0c\u9875\u9762\u6574\u4f53\u4e5f\u4f1a\u5448\u73b0\u5f88\u597d\u7684\u7ed3\u6784\u6548\u679c
\n\u4ee3\u7801\u7ed3\u6784\u6e05\u6670\uff0c\u6613\u4e8e\u9605\u8bfb\uff0c
\n\u5229\u4e8e\u5f00\u53d1\u548c\u7ef4\u62a4 \u65b9\u4fbf\u5176\u4ed6\u8bbe\u5907\u89e3\u6790\uff08\u5982\u5c4f\u5e55\u9605\u8bfb\u5668\uff09\u6839\u636e\u8bed\u4e49\u6e32\u67d3\u7f51\u9875\u3002
\n\u6709\u5229\u4e8e\u641c\u7d22\u5f15\u64ce\u4f18\u5316\uff08SEO\uff09\uff0c\u641c\u7d22\u5f15\u64ce\u722c\u866b\u4f1a\u6839\u636e\u4e0d\u540c\u7684\u6807\u7b7e\u6765\u8d4b\u4e88\u4e0d\u540c\u7684\u6743\u91cd<\/p>\n

CSS \u9009\u62e9\u5668\u53ca\u4f18\u5148\u7ea7
\n\u9009\u62e9\u5668<\/p>\n

id\u9009\u62e9\u5668(#myid)
\n\u7c7b\u9009\u62e9\u5668(.myclass)
\n\u5c5e\u6027\u9009\u62e9\u5668(a[rel=”external”])
\n\u4f2a\u7c7b\u9009\u62e9\u5668(a:hover, li:nth-child)
\n\u6807\u7b7e\u9009\u62e9\u5668(div, h1,p)
\n\u76f8\u90bb\u9009\u62e9\u5668\uff08h1 + p\uff09
\n\u5b50\u9009\u62e9\u5668(ul > li)
\n\u540e\u4ee3\u9009\u62e9\u5668(li a)
\n\u901a\u914d\u7b26\u9009\u62e9\u5668(*)<\/p>\n

\u4f18\u5148\u7ea7\uff1a<\/p>\n

!important
\n\u5185\u8054\u6837\u5f0f\uff081000\uff09
\nID\u9009\u62e9\u5668\uff080100\uff09
\n\u7c7b\u9009\u62e9\u5668\/\u5c5e\u6027\u9009\u62e9\u5668\/\u4f2a\u7c7b\u9009\u62e9\u5668\uff080010\uff09
\n\u5143\u7d20\u9009\u62e9\u5668\/\u4f2a\u5143\u7d20\u9009\u62e9\u5668\uff080001\uff09
\n\u5173\u7cfb\u9009\u62e9\u5668\/\u901a\u914d\u7b26\u9009\u62e9\u5668\uff080000\uff09<\/p>\n

\u5e26!important \u6807\u8bb0\u7684\u6837\u5f0f\u5c5e\u6027\u4f18\u5148\u7ea7\u6700\u9ad8\uff1b \u6837\u5f0f\u8868\u7684\u6765\u6e90\u76f8\u540c\u65f6\uff1a!important > \u884c\u5185\u6837\u5f0f>ID\u9009\u62e9\u5668 > \u7c7b\u9009\u62e9\u5668 > \u6807\u7b7e > \u901a\u914d\u7b26 > \u7ee7\u627f > \u6d4f\u89c8\u5668\u9ed8\u8ba4\u5c5e\u6027
\nposition \u5c5e\u6027\u7684\u503c\u6709\u54ea\u4e9b\u53ca\u5176\u533a\u522b
\n\u56fa\u5b9a\u5b9a\u4f4d fixed\uff1a \u5143\u7d20\u7684\u4f4d\u7f6e\u76f8\u5bf9\u4e8e\u6d4f\u89c8\u5668\u7a97\u53e3\u662f\u56fa\u5b9a\u4f4d\u7f6e\uff0c\u5373\u4f7f\u7a97\u53e3\u662f\u6eda\u52a8\u7684\u5b83\u4e5f\u4e0d\u4f1a\u79fb\u52a8\u3002Fixed \u5b9a \u4f4d\u4f7f\u5143\u7d20\u7684\u4f4d\u7f6e\u4e0e\u6587\u6863\u6d41\u65e0\u5173\uff0c\u56e0\u6b64\u4e0d\u5360\u636e\u7a7a\u95f4\u3002 Fixed \u5b9a\u4f4d\u7684\u5143\u7d20\u548c\u5176\u4ed6\u5143\u7d20\u91cd\u53e0\u3002
\n\u76f8\u5bf9\u5b9a\u4f4d relative\uff1a \u5982\u679c\u5bf9\u4e00\u4e2a\u5143\u7d20\u8fdb\u884c\u76f8\u5bf9\u5b9a\u4f4d\uff0c\u5b83\u5c06\u51fa\u73b0\u5728\u5b83\u6240\u5728\u7684\u4f4d\u7f6e\u4e0a\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u5782\u76f4 \u6216\u6c34\u5e73\u4f4d\u7f6e\uff0c\u8ba9\u8fd9\u4e2a\u5143\u7d20\u201c\u76f8\u5bf9\u4e8e\u201d\u5b83\u7684\u8d77\u70b9\u8fdb\u884c\u79fb\u52a8\u3002 \u5728\u4f7f\u7528\u76f8\u5bf9\u5b9a\u4f4d\u65f6\uff0c\u65e0\u8bba\u662f \u5426\u8fdb\u884c\u79fb\u52a8\uff0c\u5143\u7d20\u4ecd\u7136\u5360\u636e\u539f\u6765\u7684\u7a7a\u95f4\u3002\u56e0\u6b64\uff0c\u79fb\u52a8\u5143\u7d20\u4f1a\u5bfc\u81f4\u5b83\u8986\u76d6\u5176\u5b83\u6846\u3002
\n\u7edd\u5bf9\u5b9a\u4f4d absolute\uff1a \u7edd\u5bf9\u5b9a\u4f4d\u7684\u5143\u7d20\u7684\u4f4d\u7f6e\u76f8\u5bf9\u4e8e\u6700\u8fd1\u7684\u5df2\u5b9a\u4f4d\u7236\u5143\u7d20\uff0c\u5982\u679c\u5143\u7d20\u6ca1\u6709\u5df2\u5b9a\u4f4d\u7684\u7236\u5143\u7d20\uff0c\u90a3 \u4e48\u5b83\u7684\u4f4d\u7f6e\u76f8\u5bf9\u4e8e\u3002absolute \u5b9a\u4f4d\u4f7f\u5143\u7d20\u7684\u4f4d\u7f6e\u4e0e\u6587\u6863\u6d41\u65e0\u5173\uff0c\u56e0\u6b64\u4e0d\u5360\u636e\u7a7a\u95f4\u3002 absolute \u5b9a\u4f4d\u7684\u5143\u7d20\u548c\u5176\u4ed6\u5143\u7d20\u91cd\u53e0\u3002
\n\u7c98\u6027\u5b9a\u4f4d sticky\uff1a \u5143\u7d20\u5148\u6309\u7167\u666e\u901a\u6587\u6863\u6d41\u5b9a\u4f4d\uff0c\u7136\u540e\u76f8\u5bf9\u4e8e\u8be5\u5143\u7d20\u5728\u6d41\u4e2d\u7684 flow root\uff08BFC\uff09\u548c containing block\uff08\u6700\u8fd1\u7684\u5757\u7ea7\u7956\u5148\u5143\u7d20\uff09\u5b9a\u4f4d\u3002\u800c\u540e\uff0c\u5143\u7d20\u5b9a\u4f4d\u8868\u73b0\u4e3a\u5728\u8de8\u8d8a\u7279\u5b9a\u9608\u503c\u524d\u4e3a\u76f8\u5bf9\u5b9a \u4f4d\uff0c\u4e4b\u540e\u4e3a\u56fa\u5b9a\u5b9a\u4f4d\u3002
\n\u9ed8\u8ba4\u5b9a\u4f4d Static\uff1a \u9ed8\u8ba4\u503c\u3002\u6ca1\u6709\u5b9a\u4f4d\uff0c\u5143\u7d20\u51fa\u73b0\u5728\u6b63\u5e38\u7684\u6d41\u4e2d\uff08\u5ffd\u7565 top, bottom, left, right \u6216\u8005 z-index \u58f0 \u660e\uff09\u3002 inherit: \u89c4\u5b9a\u5e94\u8be5\u4ece\u7236\u5143\u7d20\u7ee7\u627f position \u5c5e\u6027\u7684\u503c\u3002
\nbox-sizing\u5c5e\u6027
\nbox-sizing \u89c4\u5b9a\u4e24\u4e2a\u5e76\u6392\u7684\u5e26\u8fb9\u6846\u7684\u6846\uff0c\u8bed\u6cd5\u4e3a box-sizing\uff1acontent-box\/border-box\/inherit
\ncontent-box\uff1a\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u5206\u522b\u5e94\u7528\u5230\u5143\u7d20\u7684\u5185\u5bb9\u6846\uff0c\u5728\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u4e4b\u5916\u7ed8\u5236\u5143\u7d20\u7684\u5185\u8fb9\u8ddd\u548c\u8fb9\u6846\u3002\u3010\u6807\u51c6\u76d2\u5b50\u6a21\u578b\u3011
\nborder-box\uff1a\u4e3a\u5143\u7d20\u8bbe\u5b9a\u7684\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u51b3\u5b9a\u4e86\u5143\u7d20\u7684\u8fb9\u6846\u76d2\u3002\u3010IE \u76d2\u5b50\u6a21\u578b\u3011
\ninherit\uff1a\u7ee7\u627f\u7236\u5143\u7d20\u7684 box-sizing \u503c\u3002
\nCSS \u76d2\u5b50\u6a21\u578b
\nCSS \u76d2\u6a21\u578b\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u76d2\u5b50\uff0c\u5b83\u5305\u62ec\uff1a\u8fb9\u8ddd\uff0c\u8fb9\u6846\uff0c\u586b\u5145\u548c\u5b9e\u9645\u5185\u5bb9\u3002CSS \u4e2d\u7684\u76d2\u5b50\u6a21\u578b\u5305\u62ec IE \u76d2\u5b50\u6a21\u578b\u548c\u6807\u51c6\u7684 W3C \u76d2\u5b50\u6a21\u578b\u3002
\n\u5728\u6807\u51c6\u7684\u76d2\u5b50\u6a21\u578b\u4e2d\uff0cwidth \u6307 content \u90e8\u5206\u7684\u5bbd\u5ea6\u3002
\n\u5728 IE \u76d2\u5b50\u6a21\u578b\u4e2d\uff0cwidth \u8868\u793a content+padding+border \u8fd9\u4e09\u4e2a\u90e8\u5206\u7684\u5bbd\u5ea6\u3002
\n\u6545\u5728\u8ba1\u7b97\u76d2\u5b50\u7684\u5bbd\u5ea6\u65f6\u5b58\u5728\u5dee\u5f02\uff1a
\n\u6807\u51c6\u76d2\u6a21\u578b\uff1a \u4e00\u4e2a\u5757\u7684\u603b\u5bbd\u5ea6 = width+margin(\u5de6\u53f3)+padding(\u5de6\u53f3)+border(\u5de6\u53f3)
\n\u602a\u5f02\u76d2\u6a21\u578b\uff1a \u4e00\u4e2a\u5757\u7684\u603b\u5bbd\u5ea6 = width+margin\uff08\u5de6\u53f3\uff09\uff08\u65e2 width \u5df2\u7ecf\u5305\u542b\u4e86 padding \u548c border \u503c\uff09
\nBFC\uff08\u5757\u7ea7\u683c\u5f0f\u4e0a\u4e0b\u6587\uff09
\nBFC\u7684\u6982\u5ff5
\nBFC \u662f Block Formatting Context \u7684\u7f29\u5199\uff0c\u5373\u5757\u7ea7\u683c\u5f0f\u5316\u4e0a\u4e0b\u6587\u3002BFC\u662fCSS\u5e03\u5c40\u7684\u4e00\u4e2a\u6982\u5ff5\uff0c\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u6e32\u67d3\u533a\u57df\uff0c\u89c4\u5b9a\u4e86\u5185\u90e8box\u5982\u4f55\u5e03\u5c40\uff0c \u5e76\u4e14\u8fd9\u4e2a\u533a\u57df\u7684\u5b50\u5143\u7d20\u4e0d\u4f1a\u5f71\u54cd\u5230\u5916\u9762\u7684\u5143\u7d20\uff0c\u5176\u4e2d\u6bd4\u8f83\u91cd\u8981\u7684\u5e03\u5c40\u89c4\u5219\u6709\u5185\u90e8 box \u5782\u76f4\u653e\u7f6e\uff0c\u8ba1\u7b97 BFC \u7684\u9ad8\u5ea6\u7684\u65f6\u5019\uff0c\u6d6e\u52a8\u5143\u7d20\u4e5f\u53c2\u4e0e\u8ba1\u7b97\u3002
\nBFC\u7684\u539f\u7406\u5e03\u5c40\u89c4\u5219<\/p>\n

\u5185\u90e8\u7684Box\u4f1a\u5728\u5782\u76f4\u65b9\u5411\uff0c\u4e00\u4e2a\u63a5\u4e00\u4e2a\u5730\u653e\u7f6e
\nBox\u5782\u76f4\u65b9\u5411\u7684\u8ddd\u79bb\u7531margin\u51b3\u5b9a\u3002\u5c5e\u4e8e\u540c\u4e00\u4e2aBFC\u7684\u4e24\u4e2a\u76f8\u90bbBox\u7684margin\u4f1a\u53d1\u751f\u91cd\u53e0
\n\u6bcf\u4e2a\u5143\u7d20\u7684margin box\u7684\u5de6\u8fb9\uff0c \u4e0e\u5305\u542b\u5757border box\u7684\u5de6\u8fb9\u76f8\u63a5\u89e6(\u5bf9\u4e8e\u4ece\u5de6\u5f80\u53f3\u7684\u683c\u5f0f\u5316\uff0c\u5426\u5219\u76f8\u53cd
\nBFC\u7684\u533a\u57df\u4e0d\u4f1a\u4e0efloat box\u91cd\u53e0
\nBFC\u662f\u4e00\u4e2a\u72ec\u7acb\u5bb9\u5668\uff0c\u5bb9\u5668\u91cc\u9762\u7684\u5b50\u5143\u7d20\u4e0d\u4f1a\u5f71\u54cd\u5230\u5916\u9762\u7684\u5143\u7d20
\n\u8ba1\u7b97BFC\u7684\u9ad8\u5ea6\u65f6\uff0c\u6d6e\u52a8\u5143\u7d20\u4e5f\u53c2\u4e0e\u8ba1\u7b97\u9ad8\u5ea6
\n\u5143\u7d20\u7684\u7c7b\u578b\u548cdisplay\u5c5e\u6027\uff0c\u51b3\u5b9a\u4e86\u8fd9\u4e2aBox\u7684\u7c7b\u578b\u3002\u4e0d\u540c\u7c7b\u578b\u7684Box\u4f1a\u53c2\u4e0e\u4e0d\u540c\u7684Formatting Context\u3002<\/p>\n

\u5982\u4f55\u521b\u5efaBFC\uff1f<\/p>\n

\u6839\u5143\u7d20\uff0c\u5373HTML\u5143\u7d20
\nfloat\u7684\u503c\u4e0d\u4e3anone
\nposition\u4e3aabsolute\u6216fixed
\ndisplay\u7684\u503c\u4e3ainline-block\u3001table-cell\u3001table-caption
\noverflow\u7684\u503c\u4e0d\u4e3avisible<\/p>\n

BFC\u7684\u4f7f\u7528\u573a\u666f<\/p>\n

\u53bb\u9664\u8fb9\u8ddd\u91cd\u53e0\u73b0\u8c61
\n\u6e05\u9664\u6d6e\u52a8\uff08\u8ba9\u7236\u5143\u7d20\u7684\u9ad8\u5ea6\u5305\u542b\u5b50\u6d6e\u52a8\u5143\u7d20\uff09
\n\u907f\u514d\u67d0\u5143\u7d20\u88ab\u6d6e\u52a8\u5143\u7d20\u8986\u76d6
\n\u907f\u514d\u591a\u5217\u5e03\u5c40\u7531\u4e8e\u5bbd\u5ea6\u8ba1\u7b97\u56db\u820d\u4e94\u5165\u800c\u81ea\u52a8\u6362\u884c<\/p>\n

\u8ba9\u4e00\u4e2a\u5143\u7d20\u6c34\u5e73\u5782\u76f4\u5c45\u4e2d<\/p>\n

\u6c34\u5e73\u5c45\u4e2d<\/p>\n

\u5bf9\u4e8e \u884c\u5185\u5143\u7d20 : text-align: center;<\/p>\n

\u5bf9\u4e8e\u786e\u5b9a\u5bbd\u5ea6\u7684\u5757\u7ea7\u5143\u7d20\uff1a
\n\uff081\uff09width\u548cmargin\u5b9e\u73b0\u3002margin: 0 auto;
\n\uff082\uff09\u7edd\u5bf9\u5b9a\u4f4d\u548cmargin-left: (\u7236width – \u5b50width\uff09\/2, \u524d\u63d0\u662f\u7236\u5143\u7d20position: relative<\/p>\n

\u5bf9\u4e8e\u5bbd\u5ea6\u672a\u77e5\u7684\u5757\u7ea7\u5143\u7d20
\n\uff081\uff09table\u6807\u7b7e\u914d\u5408margin\u5de6\u53f3auto\u5b9e\u73b0\u6c34\u5e73\u5c45\u4e2d\u3002\u4f7f\u7528table\u6807\u7b7e\uff08\u6216\u76f4\u63a5\u5c06\u5757\u7ea7\u5143\u7d20\u8bbe\u503c\u4e3a display:table\uff09\uff0c\u518d\u901a\u8fc7\u7ed9\u8be5\u6807\u7b7e\u6dfb\u52a0\u5de6\u53f3margin\u4e3aauto\u3002
\n\uff082\uff09inline-block\u5b9e\u73b0\u6c34\u5e73\u5c45\u4e2d\u65b9\u6cd5\u3002display\uff1ainline-block\u548ctext-align:center\u5b9e\u73b0\u6c34\u5e73\u5c45\u4e2d\u3002
\n\uff083\uff09\u7edd\u5bf9\u5b9a\u4f4d+transform\uff0ctranslateX\u53ef\u4ee5\u79fb\u52a8\u672c\u8eab\u5143\u7d20\u768450%\u3002
\n\uff084\uff09flex\u5e03\u5c40\u4f7f\u7528justify-content:center<\/p>\n

\u5782\u76f4\u5c45\u4e2d<\/p>\n

\u5229\u7528 line-height \u5b9e\u73b0\u5c45\u4e2d\uff0c\u8fd9\u79cd\u65b9\u6cd5\u9002\u5408\u7eaf\u6587\u5b57\u7c7b
\n\u901a\u8fc7\u8bbe\u7f6e\u7236\u5bb9\u5668 \u76f8\u5bf9\u5b9a\u4f4d \uff0c\u5b50\u7ea7\u8bbe\u7f6e \u7edd\u5bf9\u5b9a\u4f4d\uff0c\u6807\u7b7e\u901a\u8fc7margin\u5b9e\u73b0\u81ea\u9002\u5e94\u5c45\u4e2d
\n\u5f39\u6027\u5e03\u5c40 flex :\u7236\u7ea7\u8bbe\u7f6edisplay: flex; \u5b50\u7ea7\u8bbe\u7f6emargin\u4e3aauto\u5b9e\u73b0\u81ea\u9002\u5e94\u5c45\u4e2d
\n\u7236\u7ea7\u8bbe\u7f6e\u76f8\u5bf9\u5b9a\u4f4d\uff0c\u5b50\u7ea7\u8bbe\u7f6e\u7edd\u5bf9\u5b9a\u4f4d\uff0c\u5e76\u4e14\u901a\u8fc7\u4f4d\u79fb transform \u5b9e\u73b0
\ntable \u5e03\u5c40\uff0c\u7236\u7ea7\u901a\u8fc7\u8f6c\u6362\u6210\u8868\u683c\u5f62\u5f0f\uff0c\u7136\u540e\u5b50\u7ea7\u8bbe\u7f6e vertical-align \u5b9e\u73b0\u3002\uff08\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1avertical-align: middle\u4f7f\u7528\u7684\u524d\u63d0\u6761\u4ef6\u662f\u5185\u8054\u5143\u7d20\u4ee5\u53cadisplay\u503c\u4e3atable-cell\u7684\u5143\u7d20\uff09\u3002<\/p>\n

\u4f20\u9001\u95e8 \u261e # \u56fe\u89e3CSS\u6c34\u5e73\u5782\u76f4\u5c45\u4e2d\u5e38\u89c1\u9762\u8bd5\u65b9\u6cd5
\n\u9690\u85cf\u9875\u9762\u4e2d\u67d0\u4e2a\u5143\u7d20\u7684\u65b9\u6cd5
\n1.opacity\uff1a0\uff0c\u8be5\u5143\u7d20\u9690\u85cf\u8d77\u6765\u4e86\uff0c\u4f46\u4e0d\u4f1a\u6539\u53d8\u9875\u9762\u5e03\u5c40\uff0c\u5e76\u4e14\uff0c\u5982\u679c\u8be5\u5143\u7d20\u5df2\u7ecf\u7ed1\u5b9a \u4e00\u4e9b\u4e8b\u4ef6\uff0c\u5982click \u4e8b\u4ef6\uff0c\u90a3\u4e48\u70b9\u51fb\u8be5\u533a\u57df\uff0c\u4e5f\u80fd\u89e6\u53d1\u70b9\u51fb\u4e8b\u4ef6\u7684
\n2.visibility\uff1ahidden\uff0c\u8be5\u5143\u7d20\u9690\u85cf\u8d77\u6765\u4e86\uff0c\u4f46\u4e0d\u4f1a\u6539\u53d8\u9875\u9762\u5e03\u5c40\uff0c\u4f46\u662f\u4e0d\u4f1a\u89e6\u53d1\u8be5\u5143\u7d20\u5df2 \u7ecf\u7ed1\u5b9a\u7684\u4e8b\u4ef6 \uff0c\u9690\u85cf\u5bf9\u5e94\u5143\u7d20\uff0c\u5728\u6587\u6863\u5e03\u5c40\u4e2d\u4ecd\u4fdd\u7559\u539f\u6765\u7684\u7a7a\u95f4\uff08\u91cd\u7ed8\uff09
\n3.display\uff1anone\uff0c\u628a\u5143\u7d20\u9690\u85cf\u8d77\u6765\uff0c\u5e76\u4e14\u4f1a\u6539\u53d8\u9875\u9762\u5e03\u5c40\uff0c\u53ef\u4ee5\u7406\u89e3\u6210\u5728\u9875\u9762\u4e2d\u628a\u8be5\u5143\u7d20\u3002 \u4e0d\u663e\u793a\u5bf9\u5e94\u7684\u5143\u7d20\uff0c\u5728\u6587\u6863\u5e03\u5c40\u4e2d\u4e0d\u518d\u5206\u914d\u7a7a\u95f4\uff08\u56de\u6d41+\u91cd\u7ed8\uff09<\/p>\n

\u8be5\u95ee\u9898\u4f1a\u5f15\u51fa \u56de\u6d41\u548c\u91cd\u7ed8<\/p>\n

\u7528CSS\u5b9e\u73b0\u4e09\u89d2\u7b26\u53f7
\n\/*\u8bb0\u5fc6\u53e3\u8bc0\uff1a\u76d2\u5b50\u5bbd\u9ad8\u5747\u4e3a\u96f6\uff0c\u4e09\u9762\u8fb9\u6846\u7686\u900f\u660e\u3002 *\/
\ndiv:after{
\n position: absolute;
\n width: 0px;
\n height: 0px;
\n content: ” “;
\n border-right: 100px solid transparent;
\n border-top: 100px solid #ff0;
\n border-left: 100px solid transparent;
\n border-bottom: 100px solid transparent;
\n}
\n\u590d\u5236\u4ee3\u7801
\n\u9875\u9762\u5e03\u5c40
\n1.Flex \u5e03\u5c40
\n\u5e03\u5c40\u7684\u4f20\u7edf\u89e3\u51b3\u65b9\u6848\uff0c\u57fa\u4e8e\u76d2\u72b6\u6a21\u578b\uff0c\u4f9d\u8d56 display \u5c5e\u6027 + position \u5c5e\u6027 + float \u5c5e\u6027\u3002\u5b83\u5bf9\u4e8e\u90a3\u4e9b\u7279\u6b8a\u5e03\u5c40\u975e\u5e38\u4e0d\u65b9\u4fbf\uff0c\u6bd4\u5982\uff0c\u5782\u76f4\u5c45\u4e2d\u5c31\u4e0d\u5bb9\u6613\u5b9e\u73b0\u3002
\nFlex \u662f Flexible Box \u7684\u7f29\u5199\uff0c\u610f\u4e3a”\u5f39\u6027\u5e03\u5c40”,\u7528\u6765\u4e3a\u76d2\u72b6\u6a21\u578b\u63d0\u4f9b\u6700\u5927\u7684\u7075\u6d3b\u6027\u3002\u6307\u5b9a\u5bb9\u5668 display: flex \u5373\u53ef\u3002 \u7b80\u5355\u7684\u5206\u4e3a\u5bb9\u5668\u5c5e\u6027\u548c\u5143\u7d20\u5c5e\u6027\u3002
\n\u5bb9\u5668\u7684\u5c5e\u6027\uff1a<\/p>\n

flex-direction\uff1a\u51b3\u5b9a\u4e3b\u8f74\u7684\u65b9\u5411\uff08\u5373\u5b50 item \u7684\u6392\u5217\u65b9\u6cd5\uff09flex-direction: row | row-reverse | column | column-reverse;
\nflex-wrap\uff1a\u51b3\u5b9a\u6362\u884c\u89c4\u5219 flex-wrap: nowrap | wrap | wrap-reverse;
\nflex-flow\uff1a .box { flex-flow: || ; }
\njustify-content\uff1a\u5bf9\u5176\u65b9\u5f0f\uff0c\u6c34\u5e73\u4e3b\u8f74\u5bf9\u9f50\u65b9\u5f0f
\nalign-items\uff1a\u5bf9\u9f50\u65b9\u5f0f\uff0c\u7ad6\u76f4\u8f74\u7ebf\u65b9\u5411
\nalign-content<\/p>\n

\u9879\u76ee\u7684\u5c5e\u6027\uff08\u5143\u7d20\u7684\u5c5e\u6027\uff09\uff1a<\/p>\n

order \u5c5e\u6027\uff1a\u5b9a\u4e49\u9879\u76ee\u7684\u6392\u5217\u987a\u5e8f\uff0c\u987a\u5e8f\u8d8a\u5c0f\uff0c\u6392\u5217\u8d8a\u9760\u524d\uff0c\u9ed8\u8ba4\u4e3a 0
\nflex-grow \u5c5e\u6027\uff1a\u5b9a\u4e49\u9879\u76ee\u7684\u653e\u5927\u6bd4\u4f8b\uff0c\u5373\u4f7f\u5b58\u5728\u7a7a\u95f4\uff0c\u4e5f\u4e0d\u4f1a\u653e\u5927
\nflex-shrink \u5c5e\u6027\uff1a\u5b9a\u4e49\u4e86\u9879\u76ee\u7684\u7f29\u5c0f\u6bd4\u4f8b\uff0c\u5f53\u7a7a\u95f4\u4e0d\u8db3\u7684\u60c5\u51b5\u4e0b\u4f1a\u7b49\u6bd4\u4f8b\u7684\u7f29\u5c0f\uff0c\u5982\u679c \u5b9a\u4e49\u4e2a item \u7684 flow-shrink \u4e3a 0\uff0c\u5219\u4e3a\u4e0d\u7f29\u5c0f
\nflex-basis \u5c5e\u6027\uff1a\u5b9a\u4e49\u4e86\u5728\u5206\u914d\u591a\u4f59\u7684\u7a7a\u95f4\uff0c\u9879\u76ee\u5360\u636e\u7684\u7a7a\u95f4\u3002
\nflex\uff1a\u662f flex-grow \u548c flex-shrink\u3001flex-basis \u7684\u7b80\u5199\uff0c\u9ed8\u8ba4\u503c\u4e3a 0 1 auto\u3002
\nalign-self\uff1a\u5141\u8bb8\u5355\u4e2a\u9879\u76ee\u4e0e\u5176\u4ed6\u9879\u76ee\u4e0d\u4e00\u6837\u7684\u5bf9\u9f50\u65b9\u5f0f\uff0c\u53ef\u4ee5\u8986\u76d6
\nalign-items\uff0c\u9ed8\u8ba4\u5c5e \u6027\u4e3a auto\uff0c\u8868\u793a\u7ee7\u627f\u7236\u5143\u7d20\u7684 align-items \u6bd4\u5982\u8bf4\uff0c\u7528 flex \u5b9e\u73b0\u5723\u676f\u5e03\u5c40<\/p>\n

2.Rem \u5e03\u5c40
\n\u9996\u5148 Rem \u76f8\u5bf9\u4e8e\u6839(html)\u7684 font-size \u5927\u5c0f\u6765\u8ba1\u7b97\u3002\u7b80\u5355\u7684\u8bf4\u5b83\u5c31\u662f\u4e00\u4e2a\u76f8\u5bf9\u5355\u4f8b \u5982:font-size:10px;,\u90a3\u4e48\uff081rem = 10px\uff09\u4e86\u89e3\u8ba1\u7b97\u539f\u7406\u540e\u9996\u5148\u89e3\u51b3\u600e\u4e48\u5728\u4e0d\u540c\u8bbe\u5907\u4e0a\u8bbe\u7f6e html \u7684 font-size \u5927\u5c0f\u3002\u5176\u5b9e rem \u5e03\u5c40\u7684\u672c\u8d28\u662f\u7b49\u6bd4\u7f29\u653e\uff0c\u4e00\u822c\u662f\u57fa\u4e8e\u5bbd\u5ea6\u3002
\n\u4f18\u70b9\uff1a\u53ef\u4ee5\u5feb\u901f\u9002\u7528\u79fb\u52a8\u7aef\u5e03\u5c40\uff0c\u5b57\u4f53\uff0c\u56fe\u7247\u9ad8\u5ea6
\n\u7f3a\u70b9\uff1a
\n\u2460\u76ee\u524d ie \u4e0d\u652f\u6301\uff0c\u5bf9 pc \u9875\u9762\u6765\u8bb2\u4f7f\u7528\u6b21\u6570\u4e0d\u591a\uff1b
\n\u2461\u6570\u636e\u91cf\u5927\uff1a\u6240\u6709\u7684\u56fe\u7247\uff0c\u76d2\u5b50\u90fd\u9700\u8981\u6211\u4eec\u53bb\u7ed9\u4e00\u4e2a\u51c6\u786e\u7684\u503c\uff1b\u624d\u80fd\u4fdd\u8bc1\u4e0d\u540c\u673a\u578b\u7684\u9002\u914d\uff1b
\n\u2462\u5728\u54cd\u5e94\u5f0f\u5e03\u5c40\u4e2d\uff0c\u5fc5\u987b\u901a\u8fc7 js \u6765\u52a8\u6001\u63a7\u5236\u6839\u5143\u7d20 font-size \u7684\u5927\u5c0f\u3002\u4e5f\u5c31\u662f\u8bf4 css \u6837\u5f0f\u548c js \u4ee3\u7801\u6709\u4e00\u5b9a\u7684\u8026\u5408\u6027\u3002\u4e14\u5fc5\u987b\u5c06\u6539\u53d8 font-size \u7684\u4ee3\u7801\u653e\u5728 css \u6837\u5f0f\u4e4b\u524d\u3002
\n3.\u767e\u5206\u6bd4\u5e03\u5c40
\n\u901a\u8fc7\u767e\u5206\u6bd4\u5355\u4f4d ” % ” \u6765\u5b9e\u73b0\u54cd\u5e94\u5f0f\u7684\u6548\u679c\u3002\u901a\u8fc7\u767e\u5206\u6bd4\u5355\u4f4d\u53ef\u4ee5\u4f7f\u5f97\u6d4f\u89c8\u5668\u4e2d\u7684\u7ec4\u4ef6\u7684\u5bbd\u548c\u9ad8\u968f\u7740\u6d4f\u89c8\u5668\u7684\u53d8\u5316\u800c\u53d8\u5316\uff0c\u4ece\u800c\u5b9e\u73b0\u54cd\u5e94\u5f0f\u7684\u6548\u679c\u3002 \u76f4\u89c2\u7684\u7406\u89e3\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u8ba4\u4e3a\u5b50\u5143\u7d20\u7684\u767e\u5206\u6bd4\u5b8c\u5168\u76f8\u5bf9\u4e8e\u76f4\u63a5\u7236\u5143\u7d20\uff0cheight \u767e\u5206\u6bd4\u76f8 \u5bf9\u4e8e height\uff0cwidth \u767e\u5206\u6bd4\u76f8\u5bf9\u4e8e width\u3002 padding\u3001border\u3001margin \u7b49\u7b49\u4e0d\u8bba\u662f\u5782\u76f4\u65b9\u5411\u8fd8\u662f\u6c34\u5e73\u65b9\u5411\uff0c\u90fd\u76f8\u5bf9\u4e8e\u76f4\u63a5\u7236\u5143\u7d20\u7684 width\u3002 \u9664\u4e86 border-radius \u5916\uff0c\u8fd8\u6709\u6bd4\u5982 translate\u3001background-size \u7b49\u90fd\u662f\u76f8\u5bf9\u4e8e\u81ea\u8eab\u7684\u3002
\n\u7f3a\u70b9\uff1a
\n\uff081\uff09\u8ba1\u7b97\u56f0\u96be
\n\uff082\uff09\u5404\u4e2a\u5c5e\u6027\u4e2d\u5982\u679c\u4f7f\u7528\u767e\u5206\u6bd4\uff0c\u76f8\u5bf9\u7236\u5143\u7d20\u7684\u5c5e\u6027\u5e76\u4e0d\u662f\u552f\u4e00\u7684\u3002\u9020\u6210\u6211\u4eec\u4f7f\u7528\u767e\u5206\u6bd4\u5355\u4f4d\u5bb9\u6613\u4f7f\u5e03\u5c40\u95ee\u9898\u53d8\u5f97\u590d\u6742\u3002
\n4.\u6d6e\u52a8\u5e03\u5c40
\n\u6d6e\u52a8\u5e03\u5c40:\u5f53\u5143\u7d20\u6d6e\u52a8\u4ee5\u540e\u53ef\u4ee5\u5411\u5de6\u6216\u5411\u53f3\u79fb\u52a8\uff0c\u76f4\u5230\u5b83\u7684\u5916\u8fb9\u7f18\u78b0\u5230\u5305\u542b\u5b83\u7684\u6846\u6216\u8005\u53e6\u5916\u4e00\u4e2a\u6d6e\u52a8\u5143\u7d20\u7684\u8fb9\u6846\u4e3a\u6b62\u3002\u5143\u7d20\u6d6e\u52a8\u4ee5\u540e\u4f1a\u8131\u79bb\u6b63\u5e38\u7684\u6587\u6863\u6d41\uff0c\u6240\u4ee5\u6587\u6863\u7684\u666e\u901a\u6d41\u4e2d\u7684\u6846\u5c31\u53d8\u7684\u597d\u50cf\u6d6e\u52a8\u5143\u7d20\u4e0d\u5b58\u5728\u4e00\u6837\u3002
\n\u4f18\u70b9
\n\u8fd9\u6837\u505a\u7684\u4f18\u70b9\u5c31\u662f\u5728\u56fe\u6587\u6df7\u6392\u7684\u65f6\u5019\u53ef\u4ee5\u5f88\u597d\u7684\u4f7f\u6587\u5b57\u73af\u7ed5\u5728\u56fe\u7247\u5468\u56f4\u3002\u53e6\u5916\u5f53\u5143\u7d20\u6d6e\u52a8\u4e86\u8d77\u6765\u4e4b\u540e\uff0c\u5b83\u6709\u7740\u5757\u7ea7\u5143\u7d20\u7684\u4e00\u4e9b\u6027\u8d28\u4f8b\u5982\u53ef\u4ee5\u8bbe\u7f6e\u5bbd\u9ad8\u7b49\uff0c\u4f46\u5b83\u4e0einline-block\u8fd8\u662f\u6709\u4e00\u4e9b\u533a\u522b\u7684\uff0c\u7b2c\u4e00\u4e2a\u5c31\u662f\u5173\u4e8e\u6a2a\u5411\u6392\u5e8f\u7684\u65f6\u5019\uff0cfloat\u53ef\u4ee5\u8bbe\u7f6e\u65b9\u5411\u800cinline-block\u65b9\u5411\u662f\u56fa\u5b9a\u7684\uff1b\u8fd8\u6709\u4e00\u4e2a\u5c31\u662finline-block\u5728\u4f7f\u7528\u65f6\u6709\u65f6\u4f1a\u6709\u7a7a\u767d\u95f4\u9699\u7684\u95ee\u9898
\n\u7f3a\u70b9
\n\u6700\u660e\u663e\u7684\u7f3a\u70b9\u5c31\u662f\u6d6e\u52a8\u5143\u7d20\u4e00\u65e6\u8131\u79bb\u4e86\u6587\u6863\u6d41\uff0c\u5c31\u65e0\u6cd5\u6491\u8d77\u7236\u5143\u7d20\uff0c\u4f1a\u9020\u6210\u7236\u7ea7\u5143\u7d20\u9ad8\u5ea6\u584c\u9677\u3002
\n\u5982\u4f55\u4f7f\u7528rem\u6216viewport\u8fdb\u884c\u79fb\u52a8\u7aef\u9002\u914d
\nrem\u9002\u914d\u539f\u7406\uff1a
\n\u6539\u53d8\u4e86\u4e00\u4e2a\u5143\u7d20\u5728\u4e0d\u540c\u8bbe\u5907\u4e0a\u5360\u636e\u7684css\u50cf\u7d20\u7684\u4e2a\u6570
\nrem\u9002\u914d\u7684\u4f18\u7f3a\u70b9<\/p>\n

\u4f18\u70b9\uff1a\u6ca1\u6709\u7834\u574f\u5b8c\u7f8e\u89c6\u53e3
\n\u7f3a\u70b9\uff1apx\u503c\u8f6c\u6362rem\u592a\u8fc7\u4e8e\u590d\u6742(\u4e0b\u9762\u6211\u4eec\u4f7f\u7528less\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898)<\/p>\n

viewport\u9002\u914d\u7684\u539f\u7406
\nviewport\u9002\u914d\u65b9\u6848\u4e2d\uff0c\u6bcf\u4e00\u4e2a\u5143\u7d20\u5728\u4e0d\u540c\u8bbe\u5907\u4e0a\u5360\u636e\u7684css\u50cf\u7d20\u7684\u4e2a\u6570\u662f\u4e00\u6837\u7684\u3002\u4f46\u662fcss\u50cf\u7d20\u548c\u7269\u7406\u50cf\u7d20\u7684\u6bd4\u4f8b\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u7b49\u6bd4\u7684
\nviewport\u9002\u914d\u7684\u4f18\u7f3a\u70b9<\/p>\n

\u5728\u6211\u4eec\u8bbe\u8ba1\u56fe\u4e0a\u6240\u91cf\u53d6\u7684\u5927\u5c0f\u5373\u4e3a\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u7684\u50cf\u7d20\u5927\u5c0f\uff0c\u5373\u6240\u91cf\u5373\u6240\u8bbe
\n\u7f3a\u70b9\u7834\u574f\u5b8c\u7f8e\u89c6\u53e3<\/p>\n

\u6e05\u9664\u6d6e\u52a8\u7684\u65b9\u5f0f<\/p>\n

\u6dfb\u52a0\u989d\u5916\u6807\u7b7e<\/p>\n

\n \/\/\u6dfb\u52a0\u989d\u5916\u6807\u7b7e\u5e76\u4e14\u6dfb\u52a0clear\u5c5e\u6027<\/p>\n
<\/div>\n

\/\/\u4e5f\u53ef\u4ee5\u52a0\u4e00\u4e2abr\u6807\u7b7e\n<\/p><\/div>\n

\u590d\u5236\u4ee3\u7801<\/p>\n

\u7236\u7ea7\u6dfb\u52a0overflow\u5c5e\u6027\uff0c\u6216\u8005\u8bbe\u7f6e\u9ad8\u5ea6
\n\u5efa\u7acb\u4f2a\u7c7b\u9009\u62e9\u5668\u6e05\u9664\u6d6e\u52a8<\/p>\n

\/\/\u5728css\u4e2d\u6dfb\u52a0:after\u4f2a\u5143\u7d20
\n.parent:after{
\n \/* \u8bbe\u7f6e\u6dfb\u52a0\u5b50\u5143\u7d20\u7684\u5185\u5bb9\u662f\u7a7a *\/
\n content: ”;
\n \/* \u8bbe\u7f6e\u6dfb\u52a0\u5b50\u5143\u7d20\u4e3a\u5757\u7ea7\u5143\u7d20 *\/
\n display: block;
\n \/* \u8bbe\u7f6e\u6dfb\u52a0\u7684\u5b50\u5143\u7d20\u7684\u9ad8\u5ea60 *\/
\n height: 0;
\n \/* \u8bbe\u7f6e\u6dfb\u52a0\u5b50\u5143\u7d20\u770b\u4e0d\u89c1 *\/
\n visibility: hidden;
\n \/* \u8bbe\u7f6eclear\uff1aboth *\/
\n clear: both;
\n}
\n\u590d\u5236\u4ee3\u7801
\nJS\u3001TS\u3001ES6
\nJS\u4e2d\u76848\u79cd\u6570\u636e\u7c7b\u578b\u53ca\u533a\u522b
\n\u5305\u62ec\u503c\u7c7b\u578b(\u57fa\u672c\u5bf9\u8c61\u7c7b\u578b)\u548c\u5f15\u7528\u7c7b\u578b(\u590d\u6742\u5bf9\u8c61\u7c7b\u578b)
\n\u57fa\u672c\u7c7b\u578b(\u503c\u7c7b\u578b)\uff1a Number(\u6570\u5b57),String(\u5b57\u7b26\u4e32),Boolean(\u5e03\u5c14),Symbol(\u7b26\u53f7),null(\u7a7a),undefined(\u672a\u5b9a\u4e49)\u5728\u5185\u5b58\u4e2d\u5360\u636e\u56fa\u5b9a\u5927\u5c0f\uff0c\u4fdd\u5b58\u5728\u6808\u5185\u5b58\u4e2d
\n\u5f15\u7528\u7c7b\u578b(\u590d\u6742\u6570\u636e\u7c7b\u578b)\uff1a Object(\u5bf9\u8c61)\u3001Function(\u51fd\u6570)\u3002\u5176\u4ed6\u8fd8\u6709Array(\u6570\u7ec4)\u3001Date(\u65e5\u671f)\u3001RegExp(\u6b63\u5219\u8868\u8fbe\u5f0f)\u3001\u7279\u6b8a\u7684\u57fa\u672c\u5305\u88c5\u7c7b\u578b(String\u3001Number\u3001Boolean) \u4ee5\u53ca\u5355\u4f53\u5185\u7f6e\u5bf9\u8c61(Global\u3001Math)\u7b49 \u5f15\u7528\u7c7b\u578b\u7684\u503c\u662f\u5bf9\u8c61 \u4fdd\u5b58\u5728\u5806\u5185\u5b58\u4e2d\uff0c\u6808\u5185\u5b58\u5b58\u50a8\u7684\u662f\u5bf9\u8c61\u7684\u53d8\u91cf\u6807\u8bc6\u7b26\u4ee5\u53ca\u5bf9\u8c61\u5728\u5806\u5185\u5b58\u4e2d\u7684\u5b58\u50a8\u5730\u5740\u3002
\n\u4f20\u9001\u95e8 \u261e# JavaScript \u6570\u636e\u7c7b\u578b\u4e4b Symbol\u3001BigInt
\nJS\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u68c0\u6d4b\u65b9\u6848
\n1.typeof
\nconsole.log(typeof 1); \/\/ number
\nconsole.log(typeof true); \/\/ boolean
\nconsole.log(typeof ‘mc’); \/\/ string
\nconsole.log(typeof Symbol) \/\/ function
\nconsole.log(typeof function(){}); \/\/ function
\nconsole.log(typeof console.log()); \/\/ function
\nconsole.log(typeof []); \/\/ object
\nconsole.log(typeof {}); \/\/ object
\nconsole.log(typeof null); \/\/ object
\nconsole.log(typeof undefined); \/\/ undefined
\n\u590d\u5236\u4ee3\u7801
\n\u4f18\u70b9\uff1a\u80fd\u591f\u5feb\u901f\u533a\u5206\u57fa\u672c\u6570\u636e\u7c7b\u578b
\n\u7f3a\u70b9\uff1a\u4e0d\u80fd\u5c06Object\u3001Array\u548cNull\u533a\u5206\uff0c\u90fd\u8fd4\u56deobject
\n2.instanceof
\nconsole.log(1 instanceof Number); \/\/ false
\nconsole.log(true instanceof Boolean); \/\/ false
\nconsole.log(‘str’ instanceof String); \/\/ false
\nconsole.log([] instanceof Array); \/\/ true
\nconsole.log(function(){} instanceof Function); \/\/ true
\nconsole.log({} instanceof Object); \/\/ true
\n\u590d\u5236\u4ee3\u7801
\n\u4f18\u70b9\uff1a\u80fd\u591f\u533a\u5206Array\u3001Object\u548cFunction\uff0c\u9002\u5408\u7528\u4e8e\u5224\u65ad\u81ea\u5b9a\u4e49\u7684\u7c7b\u5b9e\u4f8b\u5bf9\u8c61
\n\u7f3a\u70b9\uff1aNumber\uff0cBoolean\uff0cString\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e0d\u80fd\u5224\u65ad
\n3.Object.prototype.toString.call()
\nvar toString = Object.prototype.toString;
\nconsole.log(toString.call(1)); \/\/[object Number]
\nconsole.log(toString.call(true)); \/\/[object Boolean]
\nconsole.log(toString.call(‘mc’)); \/\/[object String]
\nconsole.log(toString.call([])); \/\/[object Array]
\nconsole.log(toString.call({})); \/\/[object Object]
\nconsole.log(toString.call(function(){})); \/\/[object Function]
\nconsole.log(toString.call(undefined)); \/\/[object Undefined]
\nconsole.log(toString.call(null)); \/\/[object Null]
\n\u590d\u5236\u4ee3\u7801
\n\u4f18\u70b9\uff1a\u7cbe\u51c6\u5224\u65ad\u6570\u636e\u7c7b\u578b
\n\u7f3a\u70b9\uff1a\u5199\u6cd5\u7e41\u7410\u4e0d\u5bb9\u6613\u8bb0\uff0c\u63a8\u8350\u8fdb\u884c\u5c01\u88c5\u540e\u4f7f\u7528
\nvar && let && const
\nES6\u4e4b\u524d\u521b\u5efa\u53d8\u91cf\u7528\u7684\u662fvar,\u4e4b\u540e\u521b\u5efa\u53d8\u91cf\u7528\u7684\u662flet\/const
\n\u4e09\u8005\u533a\u522b\uff1a<\/p>\n

var\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u6ca1\u6709\u5757\u7684\u6982\u5ff5\uff0c\u53ef\u4ee5\u8de8\u5757\u8bbf\u95ee, \u4e0d\u80fd\u8de8\u51fd\u6570\u8bbf\u95ee\u3002
\nlet\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u53ea\u80fd\u5728\u5757\u4f5c\u7528\u57df\u91cc\u8bbf\u95ee\uff0c\u4e0d\u80fd\u8de8\u5757\u8bbf\u95ee\uff0c\u4e5f\u4e0d\u80fd\u8de8\u51fd\u6570\u8bbf\u95ee\u3002
\nconst\u7528\u6765\u5b9a\u4e49\u5e38\u91cf\uff0c\u4f7f\u7528\u65f6\u5fc5\u987b\u521d\u59cb\u5316(\u5373\u5fc5\u987b\u8d4b\u503c)\uff0c\u53ea\u80fd\u5728\u5757\u4f5c\u7528\u57df\u91cc\u8bbf\u95ee\uff0c\u4e14\u4e0d\u80fd\u4fee\u6539\u3002
\nvar\u53ef\u4ee5\u5148\u4f7f\u7528\uff0c\u540e\u58f0\u660e\uff0c\u56e0\u4e3a\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff1blet\u5fc5\u987b\u5148\u58f0\u660e\u540e\u4f7f\u7528\u3002
\nvar\u662f\u5141\u8bb8\u5728\u76f8\u540c\u4f5c\u7528\u57df\u5185\u91cd\u590d\u58f0\u660e\u540c\u4e00\u4e2a\u53d8\u91cf\u7684\uff0c\u800clet\u4e0econst\u4e0d\u5141\u8bb8\u8fd9\u4e00\u73b0\u8c61\u3002
\n\u5728\u5168\u5c40\u4e0a\u4e0b\u6587\u4e2d\uff0c\u57fa\u4e8elet\u58f0\u660e\u7684\u5168\u5c40\u53d8\u91cf\u548c\u5168\u5c40\u5bf9\u8c61GO\uff08window\uff09\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb ;
\nvar\u58f0\u660e\u7684\u53d8\u91cf\u4f1a\u548cGO\u6709\u6620\u5c04\u5173\u7cfb\uff1b
\n\u4f1a\u4ea7\u751f\u6682\u65f6\u6027\u6b7b\u533a\uff1a<\/p>\n

\u6682\u65f6\u6027\u6b7b\u533a\u662f\u6d4f\u89c8\u5668\u7684bug\uff1a\u68c0\u6d4b\u4e00\u4e2a\u672a\u88ab\u58f0\u660e\u7684\u53d8\u91cf\u7c7b\u578b\u65f6\uff0c\u4e0d\u4f1a\u62a5\u9519\uff0c\u4f1a\u8fd4\u56deundefined
\n\u5982\uff1aconsole.log(typeof a) \/\/undefined
\n\u800c\uff1aconsole.log(typeof a)\/\/\u672a\u58f0\u660e\u4e4b\u524d\u4e0d\u80fd\u4f7f\u7528
\nlet a<\/p>\n

let \/const\/function\u4f1a\u628a\u5f53\u524d\u6240\u5728\u7684\u5927\u62ec\u53f7(\u9664\u51fd\u6570\u4e4b\u5916)\u4f5c\u4e3a\u4e00\u4e2a\u5168\u65b0\u7684\u5757\u7ea7\u4e0a\u4e0b\u6587\uff0c\u5e94\u7528\u8fd9\u4e2a\u673a\u5236\uff0c\u5728\u5f00\u53d1\u9879\u76ee\u7684\u65f6\u5019\uff0c\u9047\u5230\u5faa\u73af\u4e8b\u4ef6\u7ed1\u5b9a\u7b49\u7c7b\u4f3c\u7684\u9700\u6c42\uff0c\u65e0\u9700\u518d\u81ea\u5df1\u6784\u5efa\u95ed\u5305\u6765\u5b58\u50a8\uff0c\u53ea\u8981\u57fa\u4e8elet\u7684\u5757\u4f5c\u7528\u7279\u5f81\u5373\u53ef\u89e3\u51b3<\/p>\n

JS\u5783\u573e\u56de\u6536\u673a\u5236<\/p>\n

\u9879\u76ee\u4e2d\uff0c\u5982\u679c\u5b58\u5728\u5927\u91cf\u4e0d\u88ab\u91ca\u653e\u7684\u5185\u5b58\uff08\u5806\/\u6808\/\u4e0a\u4e0b\u6587\uff09\uff0c\u9875\u9762\u6027\u80fd\u4f1a\u53d8\u5f97\u5f88\u6162\u3002\u5f53\u67d0\u4e9b\u4ee3\u7801\u64cd\u4f5c\u4e0d\u80fd\u88ab\u5408\u7406\u91ca\u653e\uff0c\u5c31\u4f1a\u9020\u6210\u5185\u5b58\u6cc4\u6f0f\u3002\u6211\u4eec\u5c3d\u53ef\u80fd\u51cf\u5c11\u4f7f\u7528\u95ed\u5305\uff0c\u56e0\u4e3a\u5b83\u4f1a\u6d88\u8017\u5185\u5b58\u3002<\/p>\n

\u6d4f\u89c8\u5668\u5783\u573e\u56de\u6536\u673a\u5236\/\u5185\u5b58\u56de\u6536\u673a\u5236:<\/p>\n

\u6d4f\u89c8\u5668\u7684Javascript\u5177\u6709\u81ea\u52a8\u5783\u573e\u56de\u6536\u673a\u5236(GC:Garbage Collecation)\uff0c\u5783\u573e\u6536\u96c6\u5668\u4f1a\u5b9a\u671f\uff08\u5468\u671f\u6027\uff09\u627e\u51fa\u90a3\u4e9b\u4e0d\u5728\u7ee7\u7eed\u4f7f\u7528\u7684\u53d8\u91cf\uff0c\u7136\u540e\u91ca\u653e\u5176\u5185\u5b58\u3002<\/p>\n

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\n\u5f53\u51fd\u6570\u4f5c\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff0cthis\u5c31\u4f1a\u6307\u5411\u8be5\u5bf9\u8c61\u3002
\n\u6784\u9020\u5668\u8c03\u7528\uff0cthis\u6307\u5411\u8fd4\u56de\u7684\u8fd9\u4e2a\u5bf9\u8c61\u3002
\n\u7bad\u5934\u51fd\u6570 \u7bad\u5934\u51fd\u6570\u7684this\u7ed1\u5b9a\u770b\u7684\u662fthis\u6240\u5728\u51fd\u6570\u5b9a\u4e49\u5728\u54ea\u4e2a\u5bf9\u8c61\u4e0b\uff0c\u5c31\u7ed1\u5b9a\u54ea\u4e2a\u5bf9\u8c61\u3002\u5982\u679c\u6709\u5d4c\u5957\u7684\u60c5\u51b5\uff0c\u5219this\u7ed1\u5b9a\u5230\u6700\u8fd1\u7684\u4e00\u5c42\u5bf9\u8c61\u4e0a\u3002
\n\u57fa\u4e8eFunction.prototype\u4e0a\u7684 apply \u3001 call \u548c bind \u8c03\u7528\u6a21\u5f0f\uff0c\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u90fd\u53ef\u4ee5\u663e\u793a\u7684\u6307\u5b9a\u8c03\u7528\u51fd\u6570\u7684 this \u6307\u5411\u3002apply\u63a5\u6536\u53c2\u6570\u7684\u662f\u6570\u7ec4\uff0ccall\u63a5\u53d7\u53c2\u6570\u5217\u8868\uff0c“ bind\u65b9\u6cd5\u901a\u8fc7\u4f20\u5165\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd4\u56de\u4e00\u4e2a this \u7ed1\u5b9a\u4e86\u4f20\u5165\u5bf9\u8c61\u7684\u65b0\u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u7684 this\u6307\u5411\u9664\u4e86\u4f7f\u7528new `\u65f6\u4f1a\u88ab\u6539\u53d8\uff0c\u5176\u4ed6\u60c5\u51b5\u4e0b\u90fd\u4e0d\u4f1a\u6539\u53d8\u3002\u82e5\u4e3a\u7a7a\u9ed8\u8ba4\u662f\u6307\u5411\u5168\u5c40\u5bf9\u8c61window\u3002<\/p>\n

\u539f\u578b && \u539f\u578b\u94fe
\n\u539f\u578b\u5173\u7cfb\uff1a<\/p>\n

\u6bcf\u4e2a class\u90fd\u6709\u663e\u793a\u539f\u578b prototype
\n\u6bcf\u4e2a\u5b9e\u4f8b\u90fd\u6709\u9690\u5f0f\u539f\u578b _ proto_
\n\u5b9e\u4f8b\u7684_ proto_\u6307\u5411\u5bf9\u5e94 class \u7684 prototype<\/p>\n

\u200c \u539f\u578b: \u00a0\u5728 JS \u4e2d\uff0c\u6bcf\u5f53\u5b9a\u4e49\u4e00\u4e2a\u5bf9\u8c61\uff08\u51fd\u6570\u4e5f\u662f\u5bf9\u8c61\uff09\u65f6\uff0c\u5bf9\u8c61\u4e2d\u90fd\u4f1a\u5305\u542b\u4e00\u4e9b\u9884\u5b9a\u4e49\u7684\u5c5e\u6027\u3002\u5176\u4e2d\u6bcf\u4e2a\u51fd\u6570\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2aprototype\u00a0\u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u6307\u5411\u51fd\u6570\u7684\u539f\u578b\u5bf9\u8c61\u3002
\n\u539f\u578b\u94fe\uff1a\u51fd\u6570\u7684\u539f\u578b\u94fe\u5bf9\u8c61constructor\u9ed8\u8ba4\u6307\u5411\u51fd\u6570\u672c\u8eab\uff0c\u539f\u578b\u5bf9\u8c61\u9664\u4e86\u6709\u539f\u578b\u5c5e\u6027\u5916\uff0c\u4e3a\u4e86\u5b9e\u73b0\u7ee7\u627f\uff0c\u8fd8\u6709\u4e00\u4e2a\u539f\u578b\u94fe\u6307\u9488__proto__,\u8be5\u6307\u9488\u662f\u6307\u5411\u4e0a\u4e00\u5c42\u7684\u539f\u578b\u5bf9\u8c61\uff0c\u800c\u4e0a\u4e00\u5c42\u7684\u539f\u578b\u5bf9\u8c61\u7684\u7ed3\u6784\u4f9d\u7136\u7c7b\u4f3c\u3002\u56e0\u6b64\u53ef\u4ee5\u5229\u7528__proto__\u4e00\u76f4\u6307\u5411Object\u7684\u539f\u578b\u5bf9\u8c61\u4e0a\uff0c\u800cObject\u539f\u578b\u5bf9\u8c61\u7528Object.prototype.__ proto__ = null\u8868\u793a\u539f\u578b\u94fe\u9876\u7aef\u3002\u5982\u6b64\u5f62\u6210\u4e86js\u7684\u539f\u578b\u94fe\u7ee7\u627f\u3002\u540c\u65f6\u6240\u6709\u7684js\u5bf9\u8c61\u90fd\u6709Object\u7684\u57fa\u672c\u9632\u8303
\n\u7279\u70b9: \u00a0JavaScript\u5bf9\u8c61\u662f\u901a\u8fc7\u5f15\u7528\u6765\u4f20\u9012\u7684\uff0c\u6211\u4eec\u521b\u5efa\u7684\u6bcf\u4e2a\u65b0\u5bf9\u8c61\u5b9e\u4f53\u4e2d\u5e76\u6ca1\u6709\u4e00\u4efd\u5c5e\u4e8e\u81ea\u5df1\u7684\u539f\u578b\u526f\u672c\u3002\u5f53\u6211\u4eec\u4fee\u6539\u539f\u578b\u65f6\uff0c\u4e0e\u4e4b\u76f8\u5173\u7684\u5bf9\u8c61\u4e5f\u4f1a\u7ee7\u627f\u8fd9\u4e00\u6539\u53d8\u3002
\nnew\u8fd0\u7b97\u7b26\u7684\u5b9e\u73b0\u673a\u5236<\/p>\n

\u9996\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u7a7a\u5bf9\u8c61
\n\u8bbe\u7f6e\u539f\u578b\uff0c\u5c06\u5bf9\u8c61\u7684\u539f\u578b\u8bbe\u7f6e\u4e3a\u51fd\u6570\u7684prototype\u5bf9\u8c61\u3002
\n\u8ba9\u51fd\u6570\u7684this\u6307\u5411\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u6267\u884c\u6784\u9020\u51fd\u6570\u7684\u4ee3\u7801\uff08\u4e3a\u8fd9\u4e2a\u65b0\u5bf9\u8c61\u6dfb\u52a0\u5c5e\u6027\uff09
\n\u5224\u65ad\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u5982\u679c\u662f\u503c\u7c7b\u578b\uff0c\u8fd4\u56de\u521b\u5efa\u7684\u5bf9\u8c61\u3002\u5982\u679c\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u5c31\u8fd4\u56de\u8fd9\u4e2a\u5f15\u7528\u7c7b\u578b\u7684\u5bf9\u8c61\u3002<\/p>\n

EventLoop \u4e8b\u4ef6\u5faa\u73af
\nJS\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u4e3a\u4e86\u9632\u6b62\u4e00\u4e2a\u51fd\u6570\u6267\u884c\u65f6\u95f4\u8fc7\u957f\u963b\u585e\u540e\u9762\u7684\u4ee3\u7801\uff0c\u6240\u4ee5\u4f1a\u5148\u5c06\u540c\u6b65\u4ee3\u7801\u538b\u5165\u6267\u884c\u6808\u4e2d\uff0c\u4f9d\u6b21\u6267\u884c\uff0c\u5c06\u5f02\u6b65\u4ee3\u7801\u63a8\u5165\u5f02\u6b65\u961f\u5217\uff0c\u5f02\u6b65\u961f\u5217\u53c8\u5206\u4e3a\u5b8f\u4efb\u52a1\u961f\u5217\u548c\u5fae\u4efb\u52a1\u961f\u5217\uff0c\u56e0\u4e3a\u5b8f\u4efb\u52a1\u961f\u5217\u7684\u6267\u884c\u65f6\u95f4\u8f83\u957f\uff0c\u6240\u4ee5\u5fae\u4efb\u52a1\u961f\u5217\u8981\u4f18\u5148\u4e8e\u5b8f\u4efb\u52a1\u961f\u5217\u3002\u5fae\u4efb\u52a1\u961f\u5217\u7684\u4ee3\u8868\u5c31\u662f\uff0cPromise.then\uff0cMutationObserver\uff0c\u5b8f\u4efb\u52a1\u7684\u8bdd\u5c31\u662fsetImmediate setTimeout setInterval
\nJS\u8fd0\u884c\u7684\u73af\u5883\u3002\u4e00\u822c\u4e3a\u6d4f\u89c8\u5668\u6216\u8005Node\u3002 \u5728\u6d4f\u89c8\u5668\u73af\u5883\u4e2d\uff0c\u6709JS \u5f15\u64ce\u7ebf\u7a0b\u548c\u6e32\u67d3\u7ebf\u7a0b\uff0c\u4e14\u4e24\u4e2a\u7ebf\u7a0b\u4e92\u65a5\u3002 Node\u73af\u5883\u4e2d\uff0c\u53ea\u6709JS \u7ebf\u7a0b\u3002 \u4e0d\u540c\u73af\u5883\u6267\u884c\u673a\u5236\u6709\u5dee\u5f02\uff0c\u4e0d\u540c\u4efb\u52a1\u8fdb\u5165\u4e0d\u540cEvent Queue\u961f\u5217\u3002 \u5f53\u4e3b\u7a0b\u7ed3\u675f\uff0c\u5148\u6267\u884c\u51c6\u5907\u597d\u5fae\u4efb\u52a1\uff0c\u7136\u540e\u518d\u6267\u884c\u51c6\u5907\u597d\u7684\u5b8f\u4efb\u52a1\uff0c\u4e00\u4e2a\u8f6e\u8be2\u7ed3\u675f\u3002
\n\u6d4f\u89c8\u5668\u4e2d\u7684\u4e8b\u4ef6\u73af\uff08Event Loop)
\n\u4e8b\u4ef6\u73af\u7684\u8fd0\u884c\u673a\u5236\u662f\uff0c\u5148\u4f1a\u6267\u884c\u6808\u4e2d\u7684\u5185\u5bb9\uff0c\u6808\u4e2d\u7684\u5185\u5bb9\u6267\u884c\u540e\u6267\u884c\u5fae\u4efb\u52a1\uff0c\u5fae\u4efb\u52a1\u6e05\u7a7a\u540e\u518d\u6267\u884c\u5b8f\u4efb\u52a1\uff0c\u5148\u53d6\u51fa\u4e00\u4e2a\u5b8f\u4efb\u52a1\uff0c\u518d\u53bb\u6267\u884c\u5fae\u4efb\u52a1\uff0c\u7136\u540e\u5728\u53d6\u5b8f\u4efb\u52a1\u6e05\u5fae\u4efb\u52a1\u8fd9\u6837\u4e0d\u505c\u7684\u5faa\u73af\u3002<\/p>\n

eventLoop \u662f\u7531JS\u7684\u5bbf\u4e3b\u73af\u5883\uff08\u6d4f\u89c8\u5668\uff09\u6765\u5b9e\u73b0\u7684\uff1b<\/p>\n

\u4e8b\u4ef6\u5faa\u73af\u53ef\u4ee5\u7b80\u5355\u7684\u63cf\u8ff0\u4e3a\u4ee5\u4e0b\u56db\u4e2a\u6b65\u9aa4:<\/p>\n

\u51fd\u6570\u5165\u6808\uff0c\u5f53Stack\u4e2d\u6267\u884c\u5230\u5f02\u6b65\u4efb\u52a1\u7684\u65f6\u5019\uff0c\u5c31\u5c06\u4ed6\u4e22\u7ed9WebAPIs,\u63a5\u7740\u6267\u884c\u540c\u6b65\u4efb\u52a1,\u76f4\u5230Stack\u4e3a\u7a7a\uff1b
\n\u6b64\u671f\u95f4WebAPIs\u5b8c\u6210\u8fd9\u4e2a\u4e8b\u4ef6\uff0c\u628a\u56de\u8c03\u51fd\u6570\u653e\u5165\u961f\u5217\u4e2d\u7b49\u5f85\u6267\u884c\uff08\u5fae\u4efb\u52a1\u653e\u5230\u5fae\u4efb\u52a1\u961f\u5217\uff0c\u5b8f\u4efb\u52a1\u653e\u5230\u5b8f\u4efb\u52a1\u961f\u5217\uff09
\n\u6267\u884c\u6808\u4e3a\u7a7a\u65f6\uff0cEvent Loop\u628a\u5fae\u4efb\u52a1\u961f\u5217\u6267\u884c\u6e05\u7a7a\uff1b
\n\u5fae\u4efb\u52a1\u961f\u5217\u6e05\u7a7a\u540e\uff0c\u8fdb\u5165\u5b8f\u4efb\u52a1\u961f\u5217\uff0c\u53d6\u961f\u5217\u7684\u7b2c\u4e00\u9879\u4efb\u52a1\u653e\u5165Stack(\u6808\uff09\u4e2d\u6267\u884c\uff0c\u6267\u884c\u5b8c\u6210\u540e\uff0c\u67e5\u770b\u5fae\u4efb\u52a1\u961f\u5217\u662f\u5426\u6709\u4efb\u52a1\uff0c\u6709\u7684\u8bdd\uff0c\u6e05\u7a7a\u5fae\u4efb\u52a1\u961f\u5217\u3002\u91cd\u590d4\uff0c\u7ee7\u7eed\u4ece\u5b8f\u4efb\u52a1\u4e2d\u53d6\u4efb\u52a1\u6267\u884c\uff0c\u6267\u884c\u5b8c\u6210\u4e4b\u540e\uff0c\u7ee7\u7eed\u6e05\u7a7a\u5fae\u4efb\u52a1\uff0c\u5982\u6b64\u53cd\u590d\u5faa\u73af\uff0c\u76f4\u81f3\u6e05\u7a7a\u6240\u6709\u7684\u4efb\u52a1\u3002<\/p>\n

\u6d4f\u89c8\u5668\u4e2d\u7684\u4efb\u52a1\u6e90(task):<\/p>\n

\u5b8f\u4efb\u52a1(macrotask)\uff1a
\n\u5bbf\u4e3b\u73af\u5883\u63d0\u4f9b\u7684\uff0c\u6bd4\u5982\u6d4f\u89c8\u5668
\najax\u3001setTimeout\u3001setInterval\u3001setTmmediate(\u53ea\u517c\u5bb9ie)\u3001script\u3001requestAnimationFrame\u3001messageChannel\u3001UI\u6e32\u67d3\u3001\u4e00\u4e9b\u6d4f\u89c8\u5668api
\n\u5fae\u4efb\u52a1(microtask)\uff1a
\n\u8bed\u8a00\u672c\u8eab\u63d0\u4f9b\u7684\uff0c\u6bd4\u5982promise.then
\nthen\u3001queueMicrotask(\u57fa\u4e8ethen)\u3001mutationObserver(\u6d4f\u89c8\u5668\u63d0\u4f9b)\u3001messageChannel \u3001mutationObersve<\/p>\n

\u4f20\u9001\u95e8 \u261e # \u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1
\nNode \u73af\u5883\u4e2d\u7684\u4e8b\u4ef6\u73af\uff08Event Loop)
\nNode\u662f\u57fa\u4e8eV8\u5f15\u64ce\u7684\u8fd0\u884c\u5728\u670d\u52a1\u7aef\u7684JavaScript\u8fd0\u884c\u73af\u5883\uff0c\u5728\u5904\u7406\u9ad8\u5e76\u53d1\u3001I\/O\u5bc6\u96c6(\u6587\u4ef6\u64cd\u4f5c\u3001\u7f51\u7edc\u64cd\u4f5c\u3001\u6570\u636e\u5e93\u64cd\u4f5c\u7b49)\u573a\u666f\u6709\u660e\u663e\u7684\u4f18\u52bf\u3002\u867d\u7136\u7528\u5230\u4e5f\u662fV8\u5f15\u64ce\uff0c\u4f46\u7531\u4e8e\u670d\u52a1\u76ee\u7684\u548c\u73af\u5883\u4e0d\u540c\uff0c\u5bfc\u81f4\u4e86\u5b83\u7684API\u4e0e\u539f\u751fJS\u6709\u4e9b\u533a\u522b\uff0c\u5176Event Loop\u8fd8\u8981\u5904\u7406\u4e00\u4e9bI\/O\uff0c\u6bd4\u5982\u65b0\u7684\u7f51\u7edc\u8fde\u63a5\u7b49\uff0c\u6240\u4ee5Node\u7684Event Loop(\u4e8b\u4ef6\u73af\u673a\u5236)\u4e0e\u6d4f\u89c8\u5668\u7684\u662f\u4e0d\u592a\u4e00\u6837\u3002
\n \u6267\u884c\u987a\u5e8f\u5982\u4e0b\uff1a<\/p>\n

timers: \u8ba1\u65f6\u5668\uff0c\u6267\u884csetTimeout\u548csetInterval\u7684\u56de\u8c03
\npending callbacks: \u6267\u884c\u5ef6\u8fdf\u5230\u4e0b\u4e00\u4e2a\u5faa\u73af\u8fed\u4ee3\u7684 I\/O \u56de\u8c03
\nidle, prepare: \u961f\u5217\u7684\u79fb\u52a8\uff0c\u4ec5\u7cfb\u7edf\u5185\u90e8\u4f7f\u7528
\npoll\u8f6e\u8be2: \u68c0\u7d22\u65b0\u7684 I\/O \u4e8b\u4ef6;\u6267\u884c\u4e0e I\/O \u76f8\u5173\u7684\u56de\u8c03\u3002\u4e8b\u5b9e\u4e0a\u9664\u4e86\u5176\u4ed6\u51e0\u4e2a\u9636\u6bb5\u5904\u7406\u7684\u4e8b\u60c5\uff0c\u5176\u4ed6\u51e0\u4e4e\u6240\u6709\u7684\u5f02\u6b65\u90fd\u5728\u8fd9\u4e2a\u9636\u6bb5\u5904\u7406\u3002
\ncheck: \u6267\u884csetImmediate\u56de\u8c03\uff0csetImmediate\u5728\u8fd9\u91cc\u6267\u884c
\nclose callbacks: \u6267\u884cclose\u4e8b\u4ef6\u7684callback\uff0c\u4e00\u4e9b\u5173\u95ed\u7684\u56de\u8c03\u51fd\u6570\uff0c\u5982\uff1asocket.on(‘close’, …)<\/p>\n

setTimeout\u3001Promise\u3001Async\/Await \u7684\u533a\u522b<\/p>\n

setTimeout
\nsettimeout\u7684\u56de\u8c03\u51fd\u6570\u653e\u5230\u5b8f\u4efb\u52a1\u961f\u5217\u91cc\uff0c\u7b49\u5230\u6267\u884c\u6808\u6e05\u7a7a\u4ee5\u540e\u6267\u884c\u3002<\/p>\n

Promise
\nPromise\u672c\u8eab\u662f\u540c\u6b65\u7684\u7acb\u5373\u6267\u884c\u51fd\u6570\uff0c \u5f53\u5728executor\u4e2d\u6267\u884cresolve\u6216\u8005reject\u7684\u65f6\u5019, \u6b64\u65f6\u662f\u5f02\u6b65\u64cd\u4f5c\uff0c \u4f1a\u5148\u6267\u884cthen\/catch\u7b49\uff0c\u5f53\u4e3b\u6808\u5b8c\u6210\u540e\uff0c\u624d\u4f1a\u53bb\u8c03\u7528resolve\/reject\u4e2d\u5b58\u653e\u7684\u65b9\u6cd5\u6267\u884c\u3002
\nconsole.log(‘script start’)
\nlet promise1 = new Promise(function (resolve) {
\n console.log(‘promise1’)
\n resolve()
\n console.log(‘promise1 end’)
\n}).then(function () {
\n console.log(‘promise2’)
\n})
\nsetTimeout(function(){
\n console.log(‘settimeout’)
\n})
\nconsole.log(‘script end’)
\n\/\/ \u8f93\u51fa\u987a\u5e8f: script start->promise1->promise1 end->script end->promise2->settimeout
\n\u590d\u5236\u4ee3\u7801<\/p>\n

async\/await
\nasync \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a Promise \u5bf9\u8c61\uff0c\u5f53\u51fd\u6570\u6267\u884c\u7684\u65f6\u5019\uff0c\u4e00\u65e6\u9047\u5230 await \u5c31\u4f1a\u5148\u8fd4\u56de\uff0c\u7b49\u5230\u89e6\u53d1\u7684\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\uff0c\u518d\u6267\u884c\u51fd\u6570\u4f53\u5185\u540e\u9762\u7684\u8bed\u53e5\u3002\u53ef\u4ee5\u7406\u89e3\u4e3a\uff0c\u662f\u8ba9\u51fa\u4e86\u7ebf\u7a0b\uff0c\u8df3\u51fa\u4e86 async \u51fd\u6570\u4f53\u3002
\nasync function async1(){
\n console.log(‘async1 start’);
\n await async2();
\n console.log(‘async1 end’)
\n}
\nasync function async2(){
\n console.log(‘async2’)
\n}<\/p>\n

console.log(‘script start’);
\nasync1();
\nconsole.log(‘script end’)<\/p>\n

\/\/ \u8f93\u51fa\u987a\u5e8f\uff1ascript start->async1 start->async2->script end->async1 end
\n\u590d\u5236\u4ee3\u7801<\/p>\n

\u4f20\u9001\u95e8 \u261e # JavaScript Promise \u4e13\u9898
\nAsync\/Await \u5982\u4f55\u901a\u8fc7\u540c\u6b65\u7684\u65b9\u5f0f\u5b9e\u73b0\u5f02\u6b65
\nAsync\/Await\u5c31\u662f\u4e00\u4e2a\u81ea\u6267\u884c\u7684generate\u51fd\u6570\u3002\u5229\u7528generate\u51fd\u6570\u7684\u7279\u6027\u628a\u5f02\u6b65\u7684\u4ee3\u7801\u5199\u6210\u201c\u540c\u6b65\u201d\u7684\u5f62\u5f0f,\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u7684\u8fd4\u56de\u503c\u4f5c\u4e3a\u540e\u9762\u4e00\u4e2a\u8bf7\u6c42\u7684\u53c2\u6570,\u5176\u4e2d\u6bcf\u4e00\u4e2a\u53c2\u6570\u90fd\u662f\u4e00\u4e2apromise\u5bf9\u8c61.
\n\u4ecb\u7ecd\u8282\u6d41\u9632\u6296\u539f\u7406\u3001\u533a\u522b\u4ee5\u53ca\u5e94\u7528
\n\u8282\u6d41\uff1a\u4e8b\u4ef6\u89e6\u53d1\u540e\uff0c\u89c4\u5b9a\u65f6\u95f4\u5185\uff0c\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e0d\u80fd\u518d\u6b21\u88ab\u8c03\u7528\u3002\u4e5f\u5c31\u662f\u8bf4\u5728\u89c4\u5b9a\u7684\u65f6\u95f4\u5185\uff0c\u51fd\u6570\u53ea\u80fd\u88ab\u8c03\u7528\u4e00\u6b21\uff0c\u4e14\u662f\u6700\u5148\u88ab\u89e6\u53d1\u8c03\u7528\u7684\u90a3\u6b21\u3002
\n\u9632\u6296\uff1a\u591a\u6b21\u89e6\u53d1\u4e8b\u4ef6\uff0c\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u53ea\u80fd\u6267\u884c\u4e00\u6b21\uff0c\u5e76\u4e14\u662f\u5728\u89e6\u53d1\u64cd\u4f5c\u7ed3\u675f\u65f6\u6267\u884c\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u4e00\u4e2a\u4e8b\u4ef6\u88ab\u89e6\u53d1\u51c6\u5907\u6267\u884c\u4e8b\u4ef6\u51fd\u6570\u524d\uff0c\u4f1a\u7b49\u5f85\u4e00\u5b9a\u7684\u65f6\u95f4\uff08\u8fd9\u65f6\u95f4\u662f\u7801\u519c\u81ea\u5df1\u53bb\u5b9a\u4e49\u7684\uff0c\u6bd4\u5982 1 \u79d2\uff09\uff0c\u5982\u679c\u6ca1\u6709\u518d\u6b21\u88ab\u89e6\u53d1\uff0c\u90a3\u4e48\u5c31\u6267\u884c\uff0c\u5982\u679c\u88ab\u89e6\u53d1\u4e86\uff0c\u90a3\u5c31\u672c\u6b21\u4f5c\u5e9f\uff0c\u91cd\u65b0\u4ece\u65b0\u89e6\u53d1\u7684\u65f6\u95f4\u5f00\u59cb\u8ba1\u7b97\uff0c\u5e76\u518d\u6b21\u7b49\u5f85 1 \u79d2\uff0c\u76f4\u5230\u80fd\u6700\u7ec8\u6267\u884c\uff01
\n\u4f7f\u7528\u573a\u666f\uff1a
\n\u8282\u6d41\uff1a\u6eda\u52a8\u52a0\u8f7d\u66f4\u591a\u3001\u641c\u7d22\u6846\u641c\u7684\u7d22\u8054\u60f3\u529f\u80fd\u3001\u9ad8\u9891\u70b9\u51fb\u3001\u8868\u5355\u91cd\u590d\u63d0\u4ea4\u2026\u2026
\n\u9632\u6296\uff1a\u641c\u7d22\u6846\u641c\u7d22\u8f93\u5165\uff0c\u5e76\u5728\u8f93\u5165\u5b8c\u4ee5\u540e\u81ea\u52a8\u641c\u7d22\u3001\u624b\u673a\u53f7\uff0c\u90ae\u7bb1\u9a8c\u8bc1\u8f93\u5165\u68c0\u6d4b\u3001\u7a97\u53e3\u5927\u5c0f resize \u53d8\u5316\u540e\uff0c\u518d\u91cd\u65b0\u6e32\u67d3\u3002
\n\/**
\n * \u8282\u6d41\u51fd\u6570 \u4e00\u4e2a\u51fd\u6570\u6267\u884c\u4e00\u6b21\u540e\uff0c\u53ea\u6709\u5927\u4e8e\u8bbe\u5b9a\u7684\u6267\u884c\u5468\u671f\u624d\u4f1a\u6267\u884c\u7b2c\u4e8c\u6b21\u3002\u6709\u4e2a\u9700\u8981\u9891\u7e41\u89e6\u53d1\u7684\u51fd\u6570\uff0c\u51fa\u4e8e\u4f18\u5316\u6027\u80fd\u7684\u89d2\u5ea6\uff0c\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\uff0c\u53ea\u8ba9\u51fd\u6570\u89e6\u53d1\u7684\u7b2c\u4e00\u6b21\u751f\u6548\uff0c\u540e\u9762\u7684\u4e0d\u751f\u6548\u3002
\n * @param fn\u8981\u88ab\u8282\u6d41\u7684\u51fd\u6570
\n * @param delay\u89c4\u5b9a\u7684\u65f6\u95f4
\n *\/
\nfunction throttle(fn, delay) {
\n \/\/\u8bb0\u5f55\u4e0a\u4e00\u6b21\u51fd\u6570\u89e6\u53d1\u7684\u65f6\u95f4
\n var lastTime = 0;
\n return function(){
\n \/\/\u8bb0\u5f55\u5f53\u524d\u51fd\u6570\u89e6\u53d1\u7684\u65f6\u95f4
\n var nowTime = Date.now();
\n if(nowTime – lastTime > delay){
\n \/\/\u4fee\u6b63this\u6307\u5411\u95ee\u9898
\n fn.call(this);
\n \/\/\u540c\u6b65\u6267\u884c\u7ed3\u675f\u65f6\u95f4
\n lastTime = nowTime;
\n }
\n }
\n}<\/p>\n

document.onscroll = throttle(function () {
\n console.log(‘scllor\u4e8b\u4ef6\u88ab\u89e6\u53d1\u4e86’ + Date.now());
\n}, 200); <\/p>\n

\/**
\n * \u9632\u6296\u51fd\u6570 \u4e00\u4e2a\u9700\u8981\u9891\u7e41\u89e6\u53d1\u7684\u51fd\u6570\uff0c\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\uff0c\u53ea\u8ba9\u6700\u540e\u4e00\u6b21\u751f\u6548\uff0c\u524d\u9762\u7684\u4e0d\u751f\u6548
\n * @param fn\u8981\u88ab\u8282\u6d41\u7684\u51fd\u6570
\n * @param delay\u89c4\u5b9a\u7684\u65f6\u95f4
\n *\/
\nfunction debounce(fn, delay) {
\n \/\/\u8bb0\u5f55\u4e0a\u4e00\u6b21\u7684\u5ef6\u65f6\u5668
\n var timer = null;
\n return function () {
\n \/\/\u6e05\u9664\u4e0a\u4e00\u6b21\u7684\u6f14\u793a\u5668
\n clearTimeout(timer);
\n \/\/\u91cd\u65b0\u8bbe\u7f6e\u65b0\u7684\u5ef6\u65f6\u5668
\n timer = setTimeout(()=>{
\n \/\/\u4fee\u6b63this\u6307\u5411\u95ee\u9898
\n fn.apply(this);
\n }, delay);
\n }
\n}
\ndocument.getElementById(‘btn’).onclick = debounce(function () {
\n console.log(‘\u6309\u94ae\u88ab\u70b9\u51fb\u4e86’ + Date.now());
\n}, 1000);
\n\u590d\u5236\u4ee3\u7801
\n\u7b80\u8ff0MVVM
\n\u4ec0\u4e48\u662fMVVM\uff1f
\n\u89c6\u56fe\u6a21\u578b\u53cc\u5411\u7ed1\u5b9a\uff0c\u662fModel-View-ViewModel\u7684\u7f29\u5199\uff0c\u4e5f\u5c31\u662f\u628aMVC\u4e2d\u7684Controller\u6f14\u53d8\u6210ViewModel\u3002Model\u5c42\u4ee3\u8868\u6570\u636e\u6a21\u578b\uff0cView\u4ee3\u8868UI\u7ec4\u4ef6\uff0cViewModel\u662fView\u548cModel\u5c42\u7684\u6865\u6881\uff0c\u6570\u636e\u4f1a\u7ed1\u5b9a\u5230viewModel\u5c42\u5e76\u81ea\u52a8\u5c06\u6570\u636e\u6e32\u67d3\u5230\u9875\u9762\u4e2d\uff0c\u89c6\u56fe\u53d8\u5316\u7684\u65f6\u5019\u4f1a\u901a\u77e5viewModel\u5c42\u66f4\u65b0\u6570\u636e\u3002\u4ee5\u524d\u662f\u64cd\u4f5cDOM\u7ed3\u6784\u66f4\u65b0\u89c6\u56fe\uff0c\u73b0\u5728\u662f\u6570\u636e\u9a71\u52a8\u89c6\u56fe\u3002
\nMVVM\u7684\u4f18\u70b9\uff1a
\n1.\u4f4e\u8026\u5408\u3002\u89c6\u56fe\uff08View\uff09\u53ef\u4ee5\u72ec\u7acb\u4e8eModel\u53d8\u5316\u548c\u4fee\u6539\uff0c\u4e00\u4e2aModel\u53ef\u4ee5\u7ed1\u5b9a\u5230\u4e0d\u540c\u7684View\u4e0a\uff0c\u5f53View\u53d8\u5316\u7684\u65f6\u5019Model\u53ef\u4ee5\u4e0d\u53d8\u5316\uff0c\u5f53Model\u53d8\u5316\u7684\u65f6\u5019View\u4e5f\u53ef\u4ee5\u4e0d\u53d8\uff1b
\n2.\u53ef\u91cd\u7528\u6027\u3002\u4f60\u53ef\u4ee5\u628a\u4e00\u4e9b\u89c6\u56fe\u903b\u8f91\u653e\u5728\u4e00\u4e2aModel\u91cc\u9762\uff0c\u8ba9\u5f88\u591aView\u91cd\u7528\u8fd9\u6bb5\u89c6\u56fe\u903b\u8f91\u3002
\n3.\u72ec\u7acb\u5f00\u53d1\u3002\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u4e13\u6ce8\u4e8e\u4e1a\u52a1\u903b\u8f91\u548c\u6570\u636e\u7684\u5f00\u53d1(ViewModel)\uff0c\u8bbe\u8ba1\u4eba\u5458\u53ef\u4ee5\u4e13\u6ce8\u4e8e\u9875\u9762\u8bbe\u8ba1\u3002
\n4.\u53ef\u6d4b\u8bd5\u3002
\nVue\u5e95\u5c42\u5b9e\u73b0\u539f\u7406
\nvue.js\u662f\u91c7\u7528\u6570\u636e\u52ab\u6301\u7ed3\u5408\u53d1\u5e03\u8005-\u8ba2\u9605\u8005\u6a21\u5f0f\u7684\u65b9\u5f0f\uff0c\u901a\u8fc7Object.defineProperty()\u6765\u52ab\u6301\u5404\u4e2a\u5c5e\u6027\u7684setter\u548cgetter\uff0c\u5728\u6570\u636e\u53d8\u52a8\u65f6\u53d1\u5e03\u6d88\u606f\u7ed9\u8ba2\u9605\u8005\uff0c\u89e6\u53d1\u76f8\u5e94\u7684\u76d1\u542c\u56de\u8c03
\nVue\u662f\u4e00\u4e2a\u5178\u578b\u7684MVVM\u6846\u67b6\uff0c\u6a21\u578b\uff08Model\uff09\u53ea\u662f\u666e\u901a\u7684javascript\u5bf9\u8c61\uff0c\u4fee\u6539\u5b83\u5219\u8bd5\u56fe\uff08View\uff09\u4f1a\u81ea\u52a8\u66f4\u65b0\u3002\u8fd9\u79cd\u8bbe\u8ba1\u8ba9\u72b6\u6001\u7ba1\u7406\u53d8\u5f97\u975e\u5e38\u7b80\u5355\u800c\u76f4\u89c2
\nObserver\uff08\u6570\u636e\u76d1\u542c\u5668\uff09 : Observer\u7684\u6838\u5fc3\u662f\u901a\u8fc7Object.defineProprtty()\u6765\u76d1\u542c\u6570\u636e\u7684\u53d8\u52a8\uff0c\u8fd9\u4e2a\u51fd\u6570\u5185\u90e8\u53ef\u4ee5\u5b9a\u4e49setter\u548cgetter\uff0c\u6bcf\u5f53\u6570\u636e\u53d1\u751f\u53d8\u5316\uff0c\u5c31\u4f1a\u89e6\u53d1setter\u3002\u8fd9\u65f6\u5019Observer\u5c31\u8981\u901a\u77e5\u8ba2\u9605\u8005\uff0c\u8ba2\u9605\u8005\u5c31\u662fWatcher
\nWatcher\uff08\u8ba2\u9605\u8005\uff09 : Watcher\u8ba2\u9605\u8005\u4f5c\u4e3aObserver\u548cCompile\u4e4b\u95f4\u901a\u4fe1\u7684\u6865\u6881\uff0c\u4e3b\u8981\u505a\u7684\u4e8b\u60c5\u662f\uff1a<\/p>\n

\u5728\u81ea\u8eab\u5b9e\u4f8b\u5316\u65f6\u5f80\u5c5e\u6027\u8ba2\u9605\u5668(dep)\u91cc\u9762\u6dfb\u52a0\u81ea\u5df1
\n\u81ea\u8eab\u5fc5\u987b\u6709\u4e00\u4e2aupdate()\u65b9\u6cd5
\n\u5f85\u5c5e\u6027\u53d8\u52a8dep.notice()\u901a\u77e5\u65f6\uff0c\u80fd\u8c03\u7528\u81ea\u8eab\u7684update()\u65b9\u6cd5\uff0c\u5e76\u89e6\u53d1Compile\u4e2d\u7ed1\u5b9a\u7684\u56de\u8c03<\/p>\n

Compile\uff08\u6307\u4ee4\u89e3\u6790\u5668\uff09 : Compile\u4e3b\u8981\u505a\u7684\u4e8b\u60c5\u662f\u89e3\u6790\u6a21\u677f\u6307\u4ee4\uff0c\u5c06\u6a21\u677f\u4e2d\u53d8\u91cf\u66ff\u6362\u6210\u6570\u636e\uff0c\u7136\u540e\u521d\u59cb\u5316\u6e32\u67d3\u9875\u9762\u89c6\u56fe\uff0c\u5e76\u5c06\u6bcf\u4e2a\u6307\u4ee4\u5bf9\u5e94\u7684\u8282\u70b9\u7ed1\u5b9a\u66f4\u65b0\u51fd\u6570\uff0c\u6dfb\u52a0\u9274\u5b9a\u6570\u636e\u7684\u8ba2\u9605\u8005\uff0c\u4e00\u65e6\u6570\u636e\u6709\u53d8\u52a8\uff0c\u6536\u5230\u901a\u77e5\uff0c\u66f4\u65b0\u8bd5\u56fe
\n\u8c08\u8c08\u5bf9vue\u751f\u547d\u5468\u671f\u7684\u7406\u89e3\uff1f
\n\u6bcf\u4e2aVue\u5b9e\u4f8b\u5728\u521b\u5efa\u65f6\u90fd\u4f1a\u7ecf\u8fc7\u4e00\u7cfb\u5217\u7684\u521d\u59cb\u5316\u8fc7\u7a0b\uff0cvue\u7684\u751f\u547d\u5468\u671f\u94a9\u5b50\uff0c\u5c31\u662f\u8bf4\u5728\u8fbe\u5230\u67d0\u4e00\u9636\u6bb5\u6216\u6761\u4ef6\u65f6\u53bb\u89e6\u53d1\u7684\u51fd\u6570\uff0c\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u5b8c\u6210\u4e00\u4e9b\u52a8\u4f5c\u6216\u8005\u4e8b\u4ef6<\/p>\n

create\u9636\u6bb5\uff1avue\u5b9e\u4f8b\u88ab\u521b\u5efa
\nbeforeCreate: \u521b\u5efa\u524d\uff0c\u6b64\u65f6data\u548cmethods\u4e2d\u7684\u6570\u636e\u90fd\u8fd8\u6ca1\u6709\u521d\u59cb\u5316
\ncreated\uff1a \u521b\u5efa\u5b8c\u6bd5\uff0cdata\u4e2d\u6709\u503c\uff0c\u672a\u6302\u8f7d
\nmount\u9636\u6bb5\uff1a vue\u5b9e\u4f8b\u88ab\u6302\u8f7d\u5230\u771f\u5b9eDOM\u8282\u70b9
\nbeforeMount\uff1a\u53ef\u4ee5\u53d1\u8d77\u670d\u52a1\u7aef\u8bf7\u6c42\uff0c\u53bb\u6570\u636e
\nmounted: \u6b64\u65f6\u53ef\u4ee5\u64cd\u4f5cDOM
\nupdate\u9636\u6bb5\uff1a\u5f53vue\u5b9e\u4f8b\u91cc\u9762\u7684data\u6570\u636e\u53d8\u5316\u65f6\uff0c\u89e6\u53d1\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3
\nbeforeUpdate :\u66f4\u65b0\u524d
\nupdated\uff1a\u66f4\u65b0\u540e
\ndestroy\u9636\u6bb5\uff1avue\u5b9e\u4f8b\u88ab\u9500\u6bc1
\nbeforeDestroy\uff1a\u5b9e\u4f8b\u88ab\u9500\u6bc1\u524d\uff0c\u6b64\u65f6\u53ef\u4ee5\u624b\u52a8\u9500\u6bc1\u4e00\u4e9b\u65b9\u6cd5
\ndestroyed:\u9500\u6bc1\u540e<\/p>\n

\u7ec4\u4ef6\u751f\u547d\u5468\u671f
\n\u751f\u547d\u5468\u671f\uff08\u7236\u5b50\u7ec4\u4ef6\uff09 \u7236\u7ec4\u4ef6beforeCreate –> \u7236\u7ec4\u4ef6created –> \u7236\u7ec4\u4ef6beforeMount –> \u5b50\u7ec4\u4ef6beforeCreate –> \u5b50\u7ec4\u4ef6created –> \u5b50\u7ec4\u4ef6beforeMount –> \u5b50\u7ec4\u4ef6 mounted –> \u7236\u7ec4\u4ef6mounted –>\u7236\u7ec4\u4ef6beforeUpdate –>\u5b50\u7ec4\u4ef6beforeDestroy–> \u5b50\u7ec4\u4ef6destroyed –> \u7236\u7ec4\u4ef6updated
\n\u52a0\u8f7d\u6e32\u67d3\u8fc7\u7a0b\u00a0\u7236beforeCreate->\u7236created->\u7236beforeMount->\u5b50beforeCreate->\u5b50created->\u5b50beforeMount->\u5b50mounted->\u7236mounted
\n\u6302\u8f7d\u9636\u6bb5\u00a0\u7236created->\u5b50created->\u5b50mounted->\u7236mounted
\n\u7236\u7ec4\u4ef6\u66f4\u65b0\u9636\u6bb5\u00a0\u7236beforeUpdate->\u7236updated
\n\u5b50\u7ec4\u4ef6\u66f4\u65b0\u9636\u6bb5\u00a0\u7236beforeUpdate->\u5b50beforeUpdate->\u5b50updated->\u7236updated
\n\u9500\u6bc1\u9636\u6bb5\u00a0\u7236beforeDestroy->\u5b50beforeDestroy->\u5b50destroyed->\u7236destroyed
\ncomputed\u4e0ewatch
\n\u901a\u4fd7\u6765\u8bb2\uff0c\u65e2\u80fd\u7528 computed \u5b9e\u73b0\u53c8\u53ef\u4ee5\u7528 watch \u76d1\u542c\u6765\u5b9e\u73b0\u7684\u529f\u80fd\uff0c\u63a8\u8350\u7528 computed\uff0c \u91cd\u70b9\u5728\u4e8e computed \u7684\u7f13\u5b58\u529f\u80fd computed \u8ba1\u7b97\u5c5e\u6027\u662f\u7528\u6765\u58f0\u660e\u5f0f\u7684\u63cf\u8ff0\u4e00\u4e2a\u503c\u4f9d\u8d56\u4e86\u5176\u5b83\u7684\u503c\uff0c\u5f53\u6240\u4f9d\u8d56\u7684\u503c\u6216\u8005\u53d8\u91cf \u6539\u53d8\u65f6\uff0c\u8ba1\u7b97\u5c5e\u6027\u4e5f\u4f1a\u8ddf\u7740\u6539\u53d8\uff1b watch \u76d1\u542c\u7684\u662f\u5df2\u7ecf\u5728 data \u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u5f53\u8be5\u53d8\u91cf\u53d8\u5316\u65f6\uff0c\u4f1a\u89e6\u53d1 watch \u4e2d\u7684\u65b9\u6cd5\u3002
\nwatch \u5c5e\u6027\u76d1\u542c \u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u952e\u662f\u9700\u8981\u89c2\u5bdf\u7684\u5c5e\u6027\uff0c\u503c\u662f\u5bf9\u5e94\u56de\u8c03\u51fd\u6570\uff0c\u4e3b\u8981\u7528\u6765\u76d1\u542c\u67d0\u4e9b\u7279\u5b9a\u6570\u636e\u7684\u53d8\u5316\uff0c\u4ece\u800c\u8fdb\u884c\u67d0\u4e9b\u5177\u4f53\u7684\u4e1a\u52a1\u903b\u8f91\u64cd\u4f5c,\u76d1\u542c\u5c5e\u6027\u7684\u53d8\u5316\uff0c\u9700\u8981\u5728\u6570\u636e\u53d8\u5316\u65f6\u6267\u884c\u5f02\u6b65\u6216\u5f00\u9500\u8f83\u5927\u7684\u64cd\u4f5c\u65f6\u4f7f\u7528
\ncomputed \u8ba1\u7b97\u5c5e\u6027 \u5c5e\u6027\u7684\u7ed3\u679c\u4f1a\u88ab\u7f13\u5b58\uff0c\u5f53computed\u4e2d\u7684\u51fd\u6570\u6240\u4f9d\u8d56\u7684\u5c5e\u6027\u6ca1\u6709\u53d1\u751f\u6539\u53d8\u7684\u65f6\u5019\uff0c\u90a3\u4e48\u8c03\u7528\u5f53\u524d\u51fd\u6570\u7684\u65f6\u5019\u7ed3\u679c\u4f1a\u4ece\u7f13\u5b58\u4e2d\u8bfb\u53d6\u3002\u9664\u975e\u4f9d\u8d56\u7684\u54cd\u5e94\u5f0f\u5c5e\u6027\u53d8\u5316\u65f6\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97\uff0c\u4e3b\u8981\u5f53\u505a\u5c5e\u6027\u6765\u4f7f\u7528 computed\u4e2d\u7684\u51fd\u6570\u5fc5\u987b\u7528return\u8fd4\u56de\u6700\u7ec8\u7684\u7ed3\u679c computed\u66f4\u9ad8\u6548\uff0c\u4f18\u5148\u4f7f\u7528\u3002data \u4e0d\u6539\u53d8\uff0ccomputed \u4e0d\u66f4\u65b0\u3002
\n\u4f7f\u7528\u573a\u666f computed\uff1a\u5f53\u4e00\u4e2a\u5c5e\u6027\u53d7\u591a\u4e2a\u5c5e\u6027\u5f71\u54cd\u7684\u65f6\u5019\u4f7f\u7528\uff0c\u4f8b\uff1a\u8d2d\u7269\u8f66\u5546\u54c1\u7ed3\u7b97\u529f\u80fd watch\uff1a\u5f53\u4e00\u6761\u6570\u636e\u5f71\u54cd\u591a\u6761\u6570\u636e\u7684\u65f6\u5019\u4f7f\u7528\uff0c\u4f8b\uff1a\u641c\u7d22\u6570\u636e
\n\u7ec4\u4ef6\u4e2d\u7684data\u4e3a\u4ec0\u4e48\u662f\u4e00\u4e2a\u51fd\u6570\uff1f
\n1.\u4e00\u4e2a\u7ec4\u4ef6\u88ab\u590d\u7528\u591a\u6b21\u7684\u8bdd\uff0c\u4e5f\u5c31\u4f1a\u521b\u5efa\u591a\u4e2a\u5b9e\u4f8b\u3002\u672c\u8d28\u4e0a\uff0c\u8fd9\u4e9b\u5b9e\u4f8b\u7528\u7684\u90fd\u662f\u540c\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u3002 2.\u5982\u679cdata\u662f\u5bf9\u8c61\u7684\u8bdd\uff0c\u5bf9\u8c61\u5c5e\u4e8e\u5f15\u7528\u7c7b\u578b\uff0c\u4f1a\u5f71\u54cd\u5230\u6240\u6709\u7684\u5b9e\u4f8b\u3002\u6240\u4ee5\u4e3a\u4e86\u4fdd\u8bc1\u7ec4\u4ef6\u4e0d\u540c\u7684\u5b9e\u4f8b\u4e4b\u95f4data\u4e0d\u51b2\u7a81\uff0cdata\u5fc5\u987b\u662f\u4e00\u4e2a\u51fd\u6570\u3002
\n\u4e3a\u4ec0\u4e48v-for\u548cv-if\u4e0d\u5efa\u8bae\u7528\u5728\u4e00\u8d77
\n1.\u5f53 v-for \u548c v-if \u5904\u4e8e\u540c\u4e00\u4e2a\u8282\u70b9\u65f6\uff0cv-for \u7684\u4f18\u5148\u7ea7\u6bd4 v-if \u66f4\u9ad8\uff0c\u8fd9\u610f\u5473\u7740 v-if \u5c06\u5206\u522b\u91cd\u590d\u8fd0\u884c\u4e8e\u6bcf\u4e2a v-for \u5faa\u73af\u4e2d\u3002\u5982\u679c\u8981\u904d\u5386\u7684\u6570\u7ec4\u5f88\u5927\uff0c\u800c\u771f\u6b63\u8981\u5c55\u793a\u7684\u6570\u636e\u5f88\u5c11\u65f6\uff0c\u8fd9\u5c06\u9020\u6210\u5f88\u5927\u7684\u6027\u80fd\u6d6a\u8d39\uff08Vue2.x\uff09
\n2.\u8fd9\u79cd\u573a\u666f\u5efa\u8bae\u4f7f\u7528 computed\uff0c\u5148\u5bf9\u6570\u636e\u8fdb\u884c\u8fc7\u6ee4
\n\u6ce8\u610f\uff1a3.x \u7248\u672c\u4e2d\u00a0v-if\u00a0\u603b\u662f\u4f18\u5148\u4e8e\u00a0v-for\u00a0\u751f\u6548\u3002\u7531\u4e8e\u8bed\u6cd5\u4e0a\u5b58\u5728\u6b67\u4e49\uff0c\u5efa\u8bae\u907f\u514d\u5728\u540c\u4e00\u5143\u7d20\u4e0a\u540c\u65f6\u4f7f\u7528\u4e24\u8005\u3002\u6bd4\u8d77\u5728\u6a21\u677f\u5c42\u9762\u7ba1\u7406\u76f8\u5173\u903b\u8f91\uff0c\u66f4\u597d\u7684\u529e\u6cd5\u662f\u901a\u8fc7\u521b\u5efa\u8ba1\u7b97\u5c5e\u6027\u7b5b\u9009\u51fa\u5217\u8868\uff0c\u5e76\u4ee5\u6b64\u521b\u5efa\u53ef\u89c1\u5143\u7d20\u3002
\n\u89e3\u60d1\u4f20\u9001\u95e8 \u261e # v-if \u4e0e v-for \u7684\u4f18\u5148\u7ea7\u5bf9\u6bd4\u975e\u517c\u5bb9
\nReact\/Vue \u9879\u76ee\u4e2d key \u7684\u4f5c\u7528<\/p>\n

key\u7684\u4f5c\u7528\u662f\u4e3a\u4e86\u5728diff\u7b97\u6cd5\u6267\u884c\u65f6\u66f4\u5feb\u7684\u627e\u5230\u5bf9\u5e94\u7684\u8282\u70b9\uff0c\u63d0\u9ad8diff\u901f\u5ea6\uff0c\u66f4\u9ad8\u6548\u7684\u66f4\u65b0\u865a\u62dfDOM;
\nvue\u548creact\u90fd\u662f\u91c7\u7528diff\u7b97\u6cd5\u6765\u5bf9\u6bd4\u65b0\u65e7\u865a\u62df\u8282\u70b9\uff0c\u4ece\u800c\u66f4\u65b0\u8282\u70b9\u3002\u5728vue\u7684diff\u51fd\u6570\u4e2d\uff0c\u4f1a\u6839\u636e\u65b0\u8282\u70b9\u7684key\u53bb\u5bf9\u6bd4\u65e7\u8282\u70b9\u6570\u7ec4\u4e2d\u7684key\uff0c\u4ece\u800c\u627e\u5230\u76f8\u5e94\u65e7\u8282\u70b9\u3002\u5982\u679c\u6ca1\u627e\u5230\u5c31\u8ba4\u4e3a\u662f\u4e00\u4e2a\u65b0\u589e\u8282\u70b9\u3002\u800c\u5982\u679c\u6ca1\u6709key\uff0c\u90a3\u4e48\u5c31\u4f1a\u91c7\u7528\u904d\u5386\u67e5\u627e\u7684\u65b9\u5f0f\u53bb\u627e\u5230\u5bf9\u5e94\u7684\u65e7\u8282\u70b9\u3002\u4e00\u79cd\u4e00\u4e2amap\u6620\u5c04\uff0c\u53e6\u4e00\u79cd\u662f\u904d\u5386\u67e5\u627e\u3002\u76f8\u6bd4\u800c\u8a00\u3002map\u6620\u5c04\u7684\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n

\u4e3a\u4e86\u5728\u6570\u636e\u53d8\u5316\u65f6\u5f3a\u5236\u66f4\u65b0\u7ec4\u4ef6\uff0c\u4ee5\u907f\u514d\u201c\u5c31\u5730\u590d\u7528\u201d\u5e26\u6765\u7684\u526f\u4f5c\u7528\u3002
\n\u5f53 Vue.js \u7528\u00a0v-for\u00a0\u66f4\u65b0\u5df2\u6e32\u67d3\u8fc7\u7684\u5143\u7d20\u5217\u8868\u65f6\uff0c\u5b83\u9ed8\u8ba4\u7528\u201c\u5c31\u5730\u590d\u7528\u201d\u7b56\u7565\u3002\u5982\u679c\u6570\u636e\u9879\u7684\u987a\u5e8f\u88ab\u6539\u53d8\uff0cVue \u5c06\u4e0d\u4f1a\u79fb\u52a8 DOM \u5143\u7d20\u6765\u5339\u914d\u6570\u636e\u9879\u7684\u987a\u5e8f\uff0c\u800c\u662f\u7b80\u5355\u590d\u7528\u6b64\u5904\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u4e14\u786e\u4fdd\u5b83\u5728\u7279\u5b9a\u7d22\u5f15\u4e0b\u663e\u793a\u5df2\u88ab\u6e32\u67d3\u8fc7\u7684\u6bcf\u4e2a\u5143\u7d20\u3002\u91cd\u590d\u7684key\u4f1a\u9020\u6210\u6e32\u67d3\u9519\u8bef\u3002<\/p>\n

vue\u7ec4\u4ef6\u7684\u901a\u4fe1\u65b9\u5f0f<\/p>\n

props\/$emit \u7236\u5b50\u7ec4\u4ef6\u901a\u4fe1
\n\u7236->\u5b50props\uff0c\u5b50->\u7236 $on\u3001$emit \u83b7\u53d6\u7236\u5b50\u7ec4\u4ef6\u5b9e\u4f8b parent\u3001children Ref \u83b7\u53d6\u5b9e\u4f8b\u7684\u65b9\u5f0f\u8c03\u7528\u7ec4\u4ef6\u7684\u5c5e\u6027\u6216\u8005\u65b9\u6cd5 \u7236->\u5b50\u5b59 Provide\u3001inject \u5b98\u65b9\u4e0d\u63a8\u8350\u4f7f\u7528\uff0c\u4f46\u662f\u5199\u7ec4\u4ef6\u5e93\u65f6\u5f88\u5e38\u7528<\/p>\n

$emit\/$on \u81ea\u5b9a\u4e49\u4e8b\u4ef6 \u5144\u5f1f\u7ec4\u4ef6\u901a\u4fe1
\nEvent Bus \u5b9e\u73b0\u8de8\u7ec4\u4ef6\u901a\u4fe1 Vue.prototype.$bus = new Vue() \u81ea\u5b9a\u4e49\u4e8b\u4ef6<\/p>\n

vuex \u8de8\u7ea7\u7ec4\u4ef6\u901a\u4fe1
\nVuex\u3001$attrs\u3001$listeners Provide\u3001inject<\/p>\n

nextTick\u7684\u5b9e\u73b0<\/p>\n

nextTick\u662fVue\u63d0\u4f9b\u7684\u4e00\u4e2a\u5168\u5c40API,\u662f\u5728\u4e0b\u6b21DOM\u66f4\u65b0\u5faa\u73af\u7ed3\u675f\u4e4b\u540e\u6267\u884c\u5ef6\u8fdf\u56de\u8c03\uff0c\u5728\u4fee\u6539\u6570\u636e\u4e4b\u540e\u4f7f\u7528$nextTick\uff0c\u5219\u53ef\u4ee5\u5728\u56de\u8c03\u4e2d\u83b7\u53d6\u66f4\u65b0\u540e\u7684DOM\uff1b
\nVue\u5728\u66f4\u65b0DOM\u65f6\u662f\u5f02\u6b65\u6267\u884c\u7684\u3002\u53ea\u8981\u4fa6\u542c\u5230\u6570\u636e\u53d8\u5316\uff0cVue\u5c06\u5f00\u542f1\u4e2a\u961f\u5217\uff0c\u5e76\u7f13\u51b2\u5728\u540c\u4e00\u4e8b\u4ef6\u5faa\u73af\u4e2d\u53d1\u751f\u7684\u6240\u6709\u6570\u636e\u53d8\u66f4\u3002\u5982\u679c\u540c\u4e00\u4e2awatcher\u88ab\u591a\u6b21\u89e6\u53d1\uff0c\u53ea\u4f1a\u88ab\u63a8\u5165\u5230\u961f\u5217\u4e2d-\u6b21\u3002\u8fd9\u79cd\u5728\u7f13\u51b2\u65f6\u53bb\u9664\u91cd\u590d\u6570\u636e\u5bf9\u4e8e\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8ba1\u7b97\u548cDOM\u64cd\u4f5c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002nextTick\u65b9\u6cd5\u4f1a\u5728\u961f\u5217\u4e2d\u52a0\u5165\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u786e\u4fdd\u8be5\u51fd\u6570\u5728\u524d\u9762\u7684dom\u64cd\u4f5c\u5b8c\u6210\u540e\u624d\u8c03\u7528\uff1b
\n\u6bd4\u5982\uff0c\u6211\u5728\u5e72\u4ec0\u4e48\u7684\u65f6\u5019\u5c31\u4f1a\u4f7f\u7528nextTick\uff0c\u4f20\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u8fdb\u53bb\uff0c\u5728\u91cc\u9762\u6267\u884cdom\u64cd\u4f5c\u5373\u53ef\uff1b
\n\u6211\u4e5f\u6709\u7b80\u5355\u4e86\u89e3nextTick\u5b9e\u73b0\uff0c\u5b83\u4f1a\u5728callbacks\u91cc\u9762\u52a0\u5165\u6211\u4eec\u4f20\u5165\u7684\u51fd\u6570\uff0c\u7136\u540e\u7528timerFunc\u5f02\u6b65\u65b9\u5f0f\u8c03\u7528\u5b83\u4eec\uff0c\u9996\u9009\u7684\u5f02\u6b65\u65b9\u5f0f\u4f1a\u662fPromise\u3002\u8fd9\u8ba9\u6211\u660e\u767d\u4e86\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u5728nextTick\u4e2d\u770b\u5230dom\u64cd\u4f5c\u7ed3\u679c\u3002<\/p>\n

nextTick\u7684\u5b9e\u73b0\u539f\u7406\u662f\u4ec0\u4e48\uff1f
\n\u5728\u4e0b\u6b21 DOM \u66f4\u65b0\u5faa\u73af\u7ed3\u675f\u4e4b\u540e\u6267\u884c\u5ef6\u8fdf\u56de\u8c03\uff0c\u5728\u4fee\u6539\u6570\u636e\u4e4b\u540e\u7acb\u5373\u4f7f\u7528 nextTick \u6765\u83b7\u53d6\u66f4\u65b0\u540e\u7684 DOM\u3002 nextTick\u4e3b\u8981\u4f7f\u7528\u4e86\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1\u3002 \u6839\u636e\u6267\u884c\u73af\u5883\u5206\u522b\u5c1d\u8bd5\u91c7\u7528Promise\u3001MutationObserver\u3001setImmediate\uff0c\u5982\u679c\u4ee5\u4e0a\u90fd\u4e0d\u884c\u5219\u91c7\u7528setTimeout\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5f02\u6b65\u65b9\u6cd5\uff0c\u591a\u6b21\u8c03\u7528nextTick\u4f1a\u5c06\u65b9\u6cd5\u5b58\u5165\u961f\u5217\u4e2d\uff0c\u901a\u8fc7\u8fd9\u4e2a\u5f02\u6b65\u65b9\u6cd5\u6e05\u7a7a\u5f53\u524d\u961f\u5217\u3002
\n\u4f7f\u7528\u8fc7\u63d2\u69fd\u4e48\uff1f\u7528\u7684\u662f\u5177\u540d\u63d2\u69fd\u8fd8\u662f\u533f\u540d\u63d2\u69fd\u6216\u4f5c\u7528\u57df\u63d2\u69fd
\nvue\u4e2d\u7684\u63d2\u69fd\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7528\u7684\u4e1c\u897fslot\u8bf4\u767d\u4e86\u5c31\u662f\u4e00\u4e2a\u5360\u4f4d\u7684 \u5728vue\u5f53\u4e2d\u63d2\u69fd\u5305\u542b\u4e09\u79cd\u4e00\u79cd\u662f\u9ed8\u8ba4\u63d2\u69fd\uff08\u533f\u540d\uff09\u4e00\u79cd\u662f\u5177\u540d\u63d2\u69fd\u8fd8\u6709\u4e00\u79cd\u5c31\u662f\u4f5c\u7528\u57df\u63d2\u69fd \u533f\u540d\u63d2\u69fd\u5c31\u662f\u6ca1\u6709\u540d\u5b57\u7684\u53ea\u8981\u9ed8\u8ba4\u7684\u90fd\u586b\u5230\u8fd9\u91cc\u5177\u540d\u63d2\u69fd\u6307\u7684\u662f\u5177\u6709\u540d\u5b57\u7684
\nkeep-alive\u7684\u5b9e\u73b0
\n\u4f5c\u7528\uff1a\u5b9e\u73b0\u7ec4\u4ef6\u7f13\u5b58\uff0c\u4fdd\u6301\u8fd9\u4e9b\u7ec4\u4ef6\u7684\u72b6\u6001\uff0c\u4ee5\u907f\u514d\u53cd\u590d\u6e32\u67d3\u5bfc\u81f4\u7684\u6027\u80fd\u95ee\u9898\u3002 \u9700\u8981\u7f13\u5b58\u7ec4\u4ef6 \u9891\u7e41\u5207\u6362\uff0c\u4e0d\u9700\u8981\u91cd\u590d\u6e32\u67d3
\n\u573a\u666f\uff1atabs\u6807\u7b7e\u9875 \u540e\u53f0\u5bfc\u822a\uff0cvue\u6027\u80fd\u4f18\u5316
\n\u539f\u7406\uff1aVue.js\u5185\u90e8\u5c06DOM\u8282\u70b9\u62bd\u8c61\u6210\u4e86\u4e00\u4e2a\u4e2a\u7684VNode\u8282\u70b9\uff0ckeep-alive\u7ec4\u4ef6\u7684\u7f13\u5b58\u4e5f\u662f\u57fa\u4e8eVNode\u8282\u70b9\u7684\u800c\u4e0d\u662f\u76f4\u63a5\u5b58\u50a8DOM\u7ed3\u6784\u3002\u5b83\u5c06\u6ee1\u8db3\u6761\u4ef6\uff08pruneCache\u4e0epruneCache\uff09\u7684\u7ec4\u4ef6\u5728cache\u5bf9\u8c61\u4e2d\u7f13\u5b58\u8d77\u6765\uff0c\u5728\u9700\u8981\u91cd\u65b0\u6e32\u67d3\u7684\u65f6\u5019\u518d\u5c06vnode\u8282\u70b9\u4ececache\u5bf9\u8c61\u4e2d\u53d6\u51fa\u5e76\u6e32\u67d3\u3002
\nmixin
\nmixin \u9879\u76ee\u53d8\u5f97\u590d\u6742\u7684\u65f6\u5019\uff0c\u591a\u4e2a\u7ec4\u4ef6\u95f4\u6709\u91cd\u590d\u7684\u903b\u8f91\u5c31\u4f1a\u7528\u5230mixin
\n\u591a\u4e2a\u7ec4\u4ef6\u6709\u76f8\u540c\u7684\u903b\u8f91\uff0c\u62bd\u79bb\u51fa\u6765
\nmixin\u5e76\u4e0d\u662f\u5b8c\u7f8e\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u4f1a\u6709\u4e00\u4e9b\u95ee\u9898
\nvue3\u63d0\u51fa\u7684Composition API\u65e8\u5728\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3010\u8ffd\u6c42\u5b8c\u7f8e\u662f\u8981\u6d88\u8017\u4e00\u5b9a\u7684\u6210\u672c\u7684\uff0c\u5982\u5f00\u53d1\u6210\u672c\u3011
\n\u573a\u666f\uff1aPC\u7aef\u65b0\u95fb\u5217\u8868\u548c\u8be6\u60c5\u9875\u4e00\u6837\u7684\u53f3\u4fa7\u680f\u76ee\uff0c\u53ef\u4ee5\u4f7f\u7528mixin\u8fdb\u884c\u6df7\u5408
\n\u52a3\u52bf\uff1a1.\u53d8\u91cf\u6765\u6e90\u4e0d\u660e\u786e\uff0c\u4e0d\u5229\u4e8e\u9605\u8bfb
\n2.\u591amixin\u53ef\u80fd\u4f1a\u9020\u6210\u547d\u540d\u51b2\u7a81 3.mixin\u548c\u7ec4\u4ef6\u53ef\u80fd\u51fa\u73b0\u591a\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u4f7f\u5f97\u9879\u76ee\u590d\u6742\u5ea6\u53d8\u9ad8
\nVuex\u7684\u7406\u89e3\u53ca\u4f7f\u7528\u573a\u666f
\nVuex \u662f\u4e00\u4e2a\u4e13\u4e3a Vue \u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u7684\u72b6\u6001\u7ba1\u7406\u6a21\u5f0f\u3002\u6bcf\u4e00\u4e2a Vuex \u5e94\u7528\u7684\u6838\u5fc3\u5c31\u662f store\uff08\u4ed3\u5e93\uff09\u3002<\/p>\n

Vuex \u7684\u72b6\u6001\u5b58\u50a8\u662f\u54cd\u5e94\u5f0f\u7684\uff1b\u5f53 Vue \u7ec4\u4ef6\u4ece store \u4e2d\u8bfb\u53d6\u72b6\u6001\u7684\u65f6\u5019\uff0c<\/p>\n

\u82e5 store \u4e2d\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\uff0c\u90a3\u4e48\u76f8\u5e94\u7684\u7ec4\u4ef6\u4e5f\u4f1a\u76f8\u5e94\u5730\u5f97\u5230\u9ad8\u6548\u66f4\u65b0 2. \u6539\u53d8 store \u4e2d\u7684\u72b6\u6001\u7684\u552f\u4e00\u9014\u5f84\u5c31\u662f\u663e\u5f0f\u5730\u63d0\u4ea4 (commit) mutation\uff0c \u8fd9\u6837\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u8ddf\u8e2a\u6bcf\u4e00\u4e2a\u72b6\u6001\u7684\u53d8\u5316 Vuex\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u6838\u5fc3\u6a21\u5757\uff1a<\/p>\n

State\uff1a\u5b9a\u4e49\u4e86\u5e94\u7528\u7684\u72b6\u6001\u6570\u636e
\nGetter\uff1a\u5728 store \u4e2d\u5b9a\u4e49\u201cgetter\u201d\uff08\u53ef\u4ee5\u8ba4\u4e3a\u662f store \u7684\u8ba1\u7b97\u5c5e\u6027\uff09\uff0c<\/p>\n

\u5c31\u50cf\u8ba1\u7b97\u5c5e\u6027\u4e00\u6837\uff0cgetter \u7684\u8fd4\u56de\u503c\u4f1a\u6839\u636e\u5b83\u7684\u4f9d\u8d56\u88ab\u7f13\u5b58\u8d77\u6765\uff0c \u4e14\u53ea\u6709\u5f53\u5b83\u7684\u4f9d\u8d56\u503c\u53d1\u751f\u4e86\u6539\u53d8\u624d\u4f1a\u88ab\u91cd\u65b0\u8ba1\u7b97 3. Mutation\uff1a\u662f\u552f\u4e00\u66f4\u6539 store \u4e2d\u72b6\u6001\u7684\u65b9\u6cd5\uff0c\u4e14\u5fc5\u987b\u662f\u540c\u6b65\u51fd\u6570 4. Action\uff1a\u7528\u4e8e\u63d0\u4ea4 mutation\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u53d8\u66f4\u72b6\u6001\uff0c\u53ef\u4ee5\u5305\u542b\u4efb\u610f\u5f02\u6b65\u64cd\u4f5c 5. Module\uff1a\u5141\u8bb8\u5c06\u5355\u4e00\u7684 Store \u62c6\u5206\u4e3a\u591a\u4e2a store \u4e14\u540c\u65f6\u4fdd\u5b58\u5728\u5355\u4e00\u7684\u72b6\u6001\u6811\u4e2d<\/p>\n

hooks\u7528\u8fc7\u5417\uff1f\u804a\u804areact\u4e2dclass\u7ec4\u4ef6\u548c\u51fd\u6570\u7ec4\u4ef6\u7684\u533a\u522b
\n\u7c7b\u7ec4\u4ef6\u662f\u4f7f\u7528ES6 \u7684 class\u00a0\u6765\u5b9a\u4e49\u7684\u7ec4\u4ef6\u3002 \u51fd\u6570\u7ec4\u4ef6\u662f\u63a5\u6536\u4e00\u4e2a\u5355\u4e00\u7684\u00a0props\u00a0\u5bf9\u8c61\u5e76\u8fd4\u56de\u4e00\u4e2aReact\u5143\u7d20\u3002
\n\u5173\u4e8eReact\u7684\u4e24\u5957API\uff08\u7c7b\uff08class\uff09API \u548c\u57fa\u4e8e\u51fd\u6570\u7684\u94a9\u5b50\uff08hooks\uff09 API\uff09\u3002\u5b98\u65b9\u63a8\u8350\u4f7f\u7528\u94a9\u5b50\uff08\u51fd\u6570\uff09\uff0c\u800c\u4e0d\u662f\u7c7b\u3002\u56e0\u4e3a\u94a9\u5b50\u66f4\u7b80\u6d01\uff0c\u4ee3\u7801\u91cf\u5c11\uff0c\u7528\u8d77\u6765\u6bd4\u8f83”\u8f7b”\uff0c\u800c\u7c7b\u6bd4\u8f83”\u91cd”\u3002\u800c\u4e14\uff0c\u94a9\u5b50\u662f\u51fd\u6570\uff0c\u66f4\u7b26\u5408 React \u51fd\u6570\u5f0f\u7684\u672c\u8d28\u3002
\n\u51fd\u6570\u4e00\u822c\u6765\u8bf4\uff0c\u53ea\u5e94\u8be5\u505a\u4e00\u4ef6\u4e8b\uff0c\u5c31\u662f\u8fd4\u56de\u4e00\u4e2a\u503c\u3002 \u5982\u679c\u4f60\u6709\u591a\u4e2a\u64cd\u4f5c\uff0c\u6bcf\u4e2a\u64cd\u4f5c\u5e94\u8be5\u5199\u6210\u4e00\u4e2a\u5355\u72ec\u7684\u51fd\u6570\u3002\u800c\u4e14\uff0c\u6570\u636e\u7684\u72b6\u6001\u5e94\u8be5\u4e0e\u64cd\u4f5c\u65b9\u6cd5\u5206\u79bb\u3002\u6839\u636e\u51fd\u6570\u8fd9\u79cd\u7406\u5ff5\uff0cReact \u7684\u51fd\u6570\u7ec4\u4ef6\u53ea\u5e94\u8be5\u505a\u4e00\u4ef6\u4e8b\u60c5\uff1a\u8fd4\u56de\u7ec4\u4ef6\u7684 HTML \u4ee3\u7801\uff0c\u800c\u6ca1\u6709\u5176\u4ed6\u7684\u529f\u80fd\u3002\u51fd\u6570\u7684\u8fd4\u56de\u7ed3\u679c\u53ea\u4f9d\u8d56\u4e8e\u5b83\u7684\u53c2\u6570\u3002\u4e0d\u6539\u53d8\u51fd\u6570\u4f53\u5916\u90e8\u6570\u636e\u3001\u51fd\u6570\u6267\u884c\u8fc7\u7a0b\u91cc\u9762\u6ca1\u6709\u526f\u4f5c\u7528\u3002
\n\u7c7b\uff08class\uff09\u662f\u6570\u636e\u548c\u903b\u8f91\u7684\u5c01\u88c5\u3002 \u4e5f\u5c31\u662f\u8bf4\uff0c\u7ec4\u4ef6\u7684\u72b6\u6001\u548c\u64cd\u4f5c\u65b9\u6cd5\u662f\u5c01\u88c5\u5728\u4e00\u8d77\u7684\u3002\u5982\u679c\u9009\u62e9\u4e86\u7c7b\u7684\u5199\u6cd5\uff0c\u5c31\u5e94\u8be5\u628a\u76f8\u5173\u7684\u6570\u636e\u548c\u64cd\u4f5c\uff0c\u90fd\u5199\u5728\u540c\u4e00\u4e2a class \u91cc\u9762\u3002
\n\u7c7b\u7ec4\u4ef6\u7684\u7f3a\u70b9 :
\n\u5927\u578b\u7ec4\u4ef6\u5f88\u96be\u62c6\u5206\u548c\u91cd\u6784\uff0c\u4e5f\u5f88\u96be\u6d4b\u8bd5\u3002
\n\u4e1a\u52a1\u903b\u8f91\u5206\u6563\u5728\u7ec4\u4ef6\u7684\u5404\u4e2a\u65b9\u6cd5\u4e4b\u4e2d\uff0c\u5bfc\u81f4\u91cd\u590d\u903b\u8f91\u6216\u5173\u8054\u903b\u8f91\u3002
\n\u7ec4\u4ef6\u7c7b\u5f15\u5165\u4e86\u590d\u6742\u7684\u7f16\u7a0b\u6a21\u5f0f\uff0c\u6bd4\u5982 render props \u548c\u9ad8\u9636\u7ec4\u4ef6\u3002
\n\u96be\u4ee5\u7406\u89e3\u7684 class\uff0c\u7406\u89e3 JavaScript \u4e2d\u00a0this\u00a0\u7684\u5de5\u4f5c\u65b9\u5f0f\u3002
\n\u533a\u522b\uff1a
\n\u51fd\u6570\u7ec4\u4ef6\u7684\u6027\u80fd\u6bd4\u7c7b\u7ec4\u4ef6\u7684\u6027\u80fd\u8981\u9ad8\uff0c\u56e0\u4e3a\u7c7b\u7ec4\u4ef6\u4f7f\u7528\u7684\u65f6\u5019\u8981\u5b9e\u4f8b\u5316\uff0c\u800c\u51fd\u6570\u7ec4\u4ef6\u76f4\u63a5\u6267\u884c\u51fd\u6570\u53d6\u8fd4\u56de\u7ed3\u679c\u5373\u53ef\u3002
\n1.\u72b6\u6001\u7684\u6709\u65e0
\nhooks\u51fa\u73b0\u4e4b\u524d\uff0c\u51fd\u6570\u7ec4\u4ef6\u6ca1\u6709\u5b9e\u4f8b\uff0c\u6ca1\u6709\u751f\u547d\u5468\u671f\uff0c\u6ca1\u6709state\uff0c\u6ca1\u6709this\uff0c\u6240\u4ee5\u6211\u4eec\u79f0\u51fd\u6570\u7ec4\u4ef6\u4e3a\u65e0\u72b6\u6001\u7ec4\u4ef6\u3002 hooks\u51fa\u73b0\u4e4b\u524d\uff0creact\u4e2d\u7684\u51fd\u6570\u7ec4\u4ef6\u901a\u5e38\u53ea\u8003\u8651\u8d1f\u8d23UI\u7684\u6e32\u67d3\uff0c\u6ca1\u6709\u81ea\u8eab\u7684\u72b6\u6001\u6ca1\u6709\u4e1a\u52a1\u903b\u8f91\u4ee3\u7801\uff0c\u662f\u4e00\u4e2a\u7eaf\u51fd\u6570\u3002\u5b83\u7684\u8f93\u51fa\u53ea\u7531\u53c2\u6570props\u51b3\u5b9a\uff0c\u4e0d\u53d7\u5176\u4ed6\u4efb\u4f55\u56e0\u7d20\u5f71\u54cd\u3002
\n2.\u8c03\u7528\u65b9\u5f0f\u7684\u4e0d\u540c
\n\u51fd\u6570\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\uff0c\u5c06\u91cd\u65b0\u8c03\u7528\u7ec4\u4ef6\u65b9\u6cd5\u8fd4\u56de\u65b0\u7684react\u5143\u7d20\u3002\u7c7b\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u5c06new\u4e00\u4e2a\u65b0\u7684\u7ec4\u4ef6\u5b9e\u4f8b\uff0c\u7136\u540e\u8c03\u7528render\u7c7b\u65b9\u6cd5\u8fd4\u56dereact\u5143\u7d20\uff0c\u8fd9\u4e5f\u8bf4\u660e\u4e3a\u4ec0\u4e48\u7c7b\u7ec4\u4ef6\u4e2dthis\u662f\u53ef\u53d8\u7684\u3002
\n3.\u56e0\u4e3a\u8c03\u7528\u65b9\u5f0f\u4e0d\u540c\uff0c\u5728\u51fd\u6570\u7ec4\u4ef6\u4f7f\u7528\u4e2d\u4f1a\u51fa\u73b0\u95ee\u9898
\n\u5728\u64cd\u4f5c\u4e2d\u6539\u53d8\u72b6\u6001\u503c\uff0c\u7c7b\u7ec4\u4ef6\u53ef\u4ee5\u83b7\u53d6\u6700\u65b0\u7684\u72b6\u6001\u503c\uff0c\u800c\u51fd\u6570\u7ec4\u4ef6\u5219\u4f1a\u6309\u7167\u987a\u5e8f\u8fd4\u56de\u72b6\u6001\u503c
\nReact Hooks\uff08\u94a9\u5b50\u7684\u4f5c\u7528\uff09
\nHook\u00a0\u662f React 16.8 \u7684\u65b0\u589e\u7279\u6027\u3002\u5b83\u53ef\u4ee5\u8ba9\u4f60\u5728\u4e0d\u7f16\u5199 class \u7684\u60c5\u51b5\u4e0b\u4f7f\u7528 state \u4ee5\u53ca\u5176\u4ed6\u7684 React \u7279\u6027\u3002
\nReact Hooks\u7684\u51e0\u4e2a\u5e38\u7528\u94a9\u5b50:<\/p>\n

useState() \/\/\u72b6\u6001\u94a9\u5b50
\nuseContext() \/\/\u5171\u4eab\u72b6\u6001\u94a9\u5b50
\nuseReducer() \/\/action \u94a9\u5b50
\nuseEffect() \/\/\u526f\u4f5c\u7528\u94a9\u5b50<\/p>\n

\u8fd8\u6709\u51e0\u4e2a\u4e0d\u5e38\u89c1\u7684\u5927\u6982\u7684\u8bf4\u4e0b\uff0c\u540e\u7eed\u4f1a\u4e13\u95e8\u5199\u7bc7\u6587\u7ae0\u63cf\u8ff0\u4e0b<\/p>\n

1.useCallback \u8bb0\u5fc6\u51fd\u6570 \u4e00\u822c\u628a\u51fd\u6570\u5f0f\u7ec4\u4ef6\u7406\u89e3\u4e3aclass\u7ec4\u4ef6render\u51fd\u6570\u7684\u8bed\u6cd5\u7cd6\uff0c\u6240\u4ee5\u6bcf\u6b21\u91cd\u65b0\u6e32\u67d3\u7684\u65f6\u5019\uff0c\u51fd\u6570\u5f0f\u7ec4\u4ef6\u5185\u90e8\u6240\u6709\u7684\u4ee3\u7801\u90fd\u4f1a\u91cd\u65b0\u6267\u884c\u4e00\u904d\u3002\u800c\u6709\u4e86 useCallback \u5c31\u4e0d\u4e00\u6837\u4e86\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7 useCallback \u83b7\u5f97\u4e00\u4e2a\u8bb0\u5fc6\u540e\u7684\u51fd\u6570\u3002
\nfunction App() {
\n const memoizedHandleClick = useCallback(() => {
\n console.log(‘Click happened’)
\n }, []); \/\/ \u7a7a\u6570\u7ec4\u4ee3\u8868\u65e0\u8bba\u4ec0\u4e48\u60c5\u51b5\u4e0b\u8be5\u51fd\u6570\u90fd\u4e0d\u4f1a\u53d1\u751f\u6539\u53d8
\n return Click Me<\/SomeComponent>;
\n}
\n\u590d\u5236\u4ee3\u7801
\n\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u5165\u4e00\u4e2a\u6570\u7ec4\uff0c\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u9879\u4e00\u65e6\u503c\u6216\u8005\u5f15\u7528\u53d1\u751f\u6539\u53d8\uff0cuseCallback \u5c31\u4f1a\u91cd\u65b0\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u8bb0\u5fc6\u51fd\u6570\u63d0\u4f9b\u7ed9\u540e\u9762\u8fdb\u884c\u6e32\u67d3\u3002<\/p>\n

2.useMemo \u8bb0\u5fc6\u7ec4\u4ef6 useCallback \u7684\u529f\u80fd\u5b8c\u5168\u53ef\u4ee5\u7531 useMemo \u6240\u53d6\u4ee3\uff0c\u5982\u679c\u4f60\u60f3\u901a\u8fc7\u4f7f\u7528 useMemo \u8fd4\u56de\u4e00\u4e2a\u8bb0\u5fc6\u51fd\u6570\u4e5f\u662f\u5b8c\u5168\u53ef\u4ee5\u7684\u3002 \u552f\u4e00\u7684\u533a\u522b\u662f\uff1auseCallback \u4e0d\u4f1a\u6267\u884c\u7b2c\u4e00\u4e2a\u53c2\u6570\u51fd\u6570\uff0c\u800c\u662f\u5c06\u5b83\u8fd4\u56de\u7ed9\u4f60\uff0c\u800c useMemo \u4f1a\u6267\u884c\u7b2c\u4e00\u4e2a\u51fd\u6570\u5e76\u4e14\u5c06\u51fd\u6570\u6267\u884c\u7ed3\u679c\u8fd4\u56de\u7ed9\u4f60\u3002
\n\u6240\u4ee5 useCallback \u5e38\u7528\u8bb0\u5fc6\u4e8b\u4ef6\u51fd\u6570\uff0c\u751f\u6210\u8bb0\u5fc6\u540e\u7684\u4e8b\u4ef6\u51fd\u6570\u5e76\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u4f7f\u7528\u3002\u800c useMemo \u66f4\u9002\u5408\u7ecf\u8fc7\u51fd\u6570\u8ba1\u7b97\u5f97\u5230\u4e00\u4e2a\u786e\u5b9a\u7684\u503c\uff0c\u6bd4\u5982\u8bb0\u5fc6\u7ec4\u4ef6\u3002<\/p>\n

3.useRef \u4fdd\u5b58\u5f15\u7528\u503c
\nuseRef \u8ddf createRef \u7c7b\u4f3c\uff0c\u90fd\u53ef\u4ee5\u7528\u6765\u751f\u6210\u5bf9 DOM \u5bf9\u8c61\u7684\u5f15\u7528\u3002useRef \u8fd4\u56de\u7684\u503c\u4f20\u9012\u7ed9\u7ec4\u4ef6\u6216\u8005 DOM \u7684 ref \u5c5e\u6027\uff0c\u5c31\u53ef\u4ee5\u901a\u8fc7 ref.current \u503c\u8bbf\u95ee\u7ec4\u4ef6\u6216\u771f\u5b9e\u7684 DOM \u8282\u70b9\uff0c\u91cd\u70b9\u662f\u7ec4\u4ef6\u4e5f\u662f\u53ef\u4ee5\u8bbf\u95ee\u5230\u7684\uff0c\u4ece\u800c\u53ef\u4ee5\u5bf9 DOM \u8fdb\u884c\u4e00\u4e9b\u64cd\u4f5c\uff0c\u6bd4\u5982\u76d1\u542c\u4e8b\u4ef6\u7b49\u7b49\u3002<\/p>\n

4.useImperativeHandle \u7a7f\u900f Ref
\n\u901a\u8fc7 useImperativeHandle \u7528\u4e8e\u8ba9\u7236\u7ec4\u4ef6\u83b7\u53d6\u5b50\u7ec4\u4ef6\u5185\u7684\u7d22\u5f15<\/p>\n

5.useLayoutEffect \u540c\u6b65\u6267\u884c\u526f\u4f5c\u7528
\n\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 useEffect \u5c31\u53ef\u4ee5\u5e2e\u6211\u4eec\u5904\u7406\u7ec4\u4ef6\u7684\u526f\u4f5c\u7528\uff0c\u4f46\u662f\u5982\u679c\u60f3\u8981\u540c\u6b65\u8c03\u7528\u4e00\u4e9b\u526f\u4f5c\u7528\uff0c\u6bd4\u5982\u5bf9 DOM \u7684\u64cd\u4f5c\uff0c\u5c31\u9700\u8981\u4f7f\u7528 useLayoutEffect\uff0cuseLayoutEffect \u4e2d\u7684\u526f\u4f5c\u7528\u4f1a\u5728 DOM \u66f4\u65b0\u4e4b\u540e\u540c\u6b65\u6267\u884c\u3002
\nuseEffect\u548cuseLayoutEffect\u6709\u4ec0\u4e48\u533a\u522b\uff1a\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u8c03\u7528\u65f6\u673a\u4e0d\u540c\uff0cuseLayoutEffect\u548c\u539f\u6765componentDidMount&componentDidUpdate\u4e00\u81f4\uff0c\u5728react\u5b8c\u6210DOM\u66f4\u65b0\u540e\u9a6c\u4e0a\u540c\u6b65\u8c03\u7528\u7684\u4ee3\u7801\uff0c\u4f1a\u963b\u585e\u9875\u9762\u6e32\u67d3\u3002\u800cuseEffect\u662f\u4f1a\u5728\u6574\u4e2a\u9875\u9762\u6e32\u67d3\u5b8c\u624d\u4f1a\u8c03\u7528\u7684\u4ee3\u7801\u3002\u5b98\u65b9\u5efa\u8bae\u4f18\u5148\u4f7f\u7528useEffect<\/p>\n

React \u7ec4\u4ef6\u901a\u4fe1\u65b9\u5f0f
\nreact\u7ec4\u4ef6\u95f4\u901a\u4fe1\u5e38\u89c1\u7684\u51e0\u79cd\u60c5\u51b5:<\/p>\n

\u7236\u7ec4\u4ef6\u5411\u5b50\u7ec4\u4ef6\u901a\u4fe1<\/p>\n

\u5b50\u7ec4\u4ef6\u5411\u7236\u7ec4\u4ef6\u901a\u4fe1<\/p>\n

\u8de8\u7ea7\u7ec4\u4ef6\u901a\u4fe1<\/p>\n

\u975e\u5d4c\u5957\u5173\u7cfb\u7684\u7ec4\u4ef6\u901a\u4fe1<\/p>\n

1\uff09\u7236\u7ec4\u4ef6\u5411\u5b50\u7ec4\u4ef6\u901a\u4fe1
\n\u7236\u7ec4\u4ef6\u901a\u8fc7 props \u5411\u5b50\u7ec4\u4ef6\u4f20\u9012\u9700\u8981\u7684\u4fe1\u606f\u3002\u7236\u4f20\u5b50\u662f\u5728\u7236\u7ec4\u4ef6\u4e2d\u76f4\u63a5\u7ed1\u5b9a\u4e00\u4e2a\u6b63\u5e38\u7684\u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u5c31\u662f\u6307\u5177\u4f53\u7684\u503c\uff0c\u5728\u5b50\u7ec4\u4ef6\u4e2d\uff0c\u7528props\u5c31\u53ef\u4ee5\u83b7\u53d6\u5230\u8fd9\u4e2a\u503c
\n\/\/ \u5b50\u7ec4\u4ef6: Child
\nconst Child = props =>{
\n return <\/p>\n

{props.name}<\/p>\n

}<\/p>\n

\/\/ \u7236\u7ec4\u4ef6 Parent
\nconst Parent = ()=>{
\n return <\/Child>
\n}
\n\u590d\u5236\u4ee3\u7801
\n2\uff09\u5b50\u7ec4\u4ef6\u5411\u7236\u7ec4\u4ef6\u901a\u4fe1
\nprops+\u56de\u8c03\u7684\u65b9\u5f0f\uff0c\u4f7f\u7528\u516c\u5171\u7ec4\u4ef6\u8fdb\u884c\u72b6\u6001\u63d0\u5347\u3002\u5b50\u4f20\u7236\u662f\u5148\u5728\u7236\u7ec4\u4ef6\u4e0a\u7ed1\u5b9a\u5c5e\u6027\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u51fd\u6570\uff0c\u5f53\u5b50\u7ec4\u4ef6\u9700\u8981\u7ed9\u7236\u7ec4\u4ef6\u4f20\u503c\u7684\u65f6\u5019\uff0c\u5219\u901a\u8fc7props\u8c03\u7528\u8be5\u51fd\u6570\u5c06\u53c2\u6570\u4f20\u5165\u5230\u8be5\u51fd\u6570\u5f53\u4e2d\uff0c\u6b64\u65f6\u5c31\u53ef\u4ee5\u5728\u7236\u7ec4\u4ef6\u4e2d\u7684\u51fd\u6570\u4e2d\u63a5\u6536\u5230\u8be5\u53c2\u6570\u4e86\uff0c\u8fd9\u4e2a\u53c2\u6570\u5219\u4e3a\u5b50\u7ec4\u4ef6\u4f20\u8fc7\u6765\u7684\u503c
\n\/\/ \u5b50\u7ec4\u4ef6: Child
\nconst Child = props =>{
\n const cb = msg =>{
\n return ()=>{
\n props.callback(msg)
\n }
\n }
\n return (
\n