{"id":441,"date":"2021-05-28T11:15:08","date_gmt":"2021-05-28T03:15:08","guid":{"rendered":"https:\/\/sanlangcode.com\/?p=441"},"modified":"2021-05-28T11:15:08","modified_gmt":"2021-05-28T03:15:08","slug":"%e4%bb%8e%e8%be%93%e5%85%a5url%e5%88%b0%e9%a1%b5%e9%9d%a2%e5%8a%a0%e8%bd%bd%e7%9a%84%e4%b8%bb%e5%b9%b2%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/sanlangcode.com\/index.php\/2021\/05\/28\/%e4%bb%8e%e8%be%93%e5%85%a5url%e5%88%b0%e9%a1%b5%e9%9d%a2%e5%8a%a0%e8%bd%bd%e7%9a%84%e4%b8%bb%e5%b9%b2%e6%b5%81%e7%a8%8b\/","title":{"rendered":"\u4ece\u8f93\u5165URL\u5230\u9875\u9762\u52a0\u8f7d\u7684\u4e3b\u5e72\u6d41\u7a0b"},"content":{"rendered":"\n

\u524d\u9762\u7684\u8bdd<\/h2>\n\n\n\n

\u3000\u3000\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u4ece\u8f93\u5165URL\u5230\u9875\u9762\u52a0\u8f7d\u7684\u5168\u8fc7\u7a0b<\/p>\n\n\n\n

\u6982\u8ff0<\/h3>\n\n\n\n

\u3000\u3000\u4ece\u8f93\u5165URL\u5230\u9875\u9762\u52a0\u8f7d\u7684\u4e3b\u5e72\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n

\u3000\u30001\u3001\u6d4f\u89c8\u5668\u6784\u5efaHTTP Request\u8bf7\u6c42<\/p>\n\n\n\n

\u3000\u30002\u3001\u7f51\u7edc\u4f20\u8f93<\/p>\n\n\n\n

\u3000\u30003\u3001\u670d\u52a1\u5668\u6784\u5efaHTTP Response \u54cd\u5e94<\/p>\n\n\n\n

\u3000\u30004\u3001\u7f51\u7edc\u4f20\u8f93<\/p>\n\n\n\n

\u3000\u30005\u3001\u6d4f\u89c8\u5668\u6e32\u67d3\u9875\u9762<\/p>\n\n\n\n

\"http\"\/<\/figure>\n\n\n\n

\u6784\u5efa\u8bf7\u6c42<\/h3>\n\n\n\n

\u3000\u30001\u3001\u5e94\u7528\u5c42\u8fdb\u884cDNS\u89e3\u6790<\/p>\n\n\n\n

\u3000\u3000\u901a\u8fc7DNS\u5c06\u57df\u540d\u89e3\u6790\u6210IP\u5730\u5740\u3002\u5728\u89e3\u6790\u8fc7\u7a0b\u4e2d\uff0c\u6309\u7167\u6d4f\u89c8\u5668\u7f13\u5b58<\/code>\u3001\u7cfb\u7edf\u7f13\u5b58<\/code>\u3001\u8def\u7531\u5668\u7f13\u5b58<\/code>\u3001ISP(\u8fd0\u8425\u5546)DNS\u7f13\u5b58<\/code>\u3001\u6839\u57df\u540d\u670d\u52a1\u5668<\/code>\u3001\u9876\u7ea7\u57df\u540d\u670d\u52a1\u5668<\/code>\u3001\u4e3b\u57df\u540d\u670d\u52a1\u5668<\/code>\u7684\u987a\u5e8f\uff0c\u9010\u6b65\u8bfb\u53d6\u7f13\u5b58\uff0c\u76f4\u5230\u62ff\u5230IP\u5730\u5740<\/p>\n\n\n\n

\u3000\u3000\u8fd9\u91cc\u4f7f\u7528DNS\u9884\u89e3\u6790\uff0c\u53ef\u4ee5\u6839\u636e\u6d4f\u89c8\u5668\u5b9a\u4e49\u7684\u89c4\u5219\uff0c\u63d0\u524d\u89e3\u6790\u4e4b\u540e\u53ef\u80fd\u4f1a\u7528\u5230\u7684\u57df\u540d\uff0c\u4f7f\u89e3\u6790\u7ed3\u679c\u7f13\u5b58\u5230\u7cfb\u7edf\u7f13\u5b58<\/code>\u4e2d\uff0c\u7f29\u77edDNS\u89e3\u6790\u65f6\u95f4\uff0c\u6765\u63d0\u9ad8\u7f51\u7ad9\u7684\u8bbf\u95ee\u901f\u5ea6<\/p>\n\n\n\n

\u3000\u30002\u3001\u5e94\u7528\u5c42\u751f\u6210HTTP\u8bf7\u6c42\u62a5\u6587<\/p>\n\n\n\n

\u3000\u3000\u63a5\u7740\uff0c\u5e94\u7528\u5c42\u751f\u6210\u9488\u5bf9\u76ee\u6807WEB\u670d\u52a1\u5668\u7684HTTP\u8bf7\u6c42\u62a5\u6587\uff0cHTTP\u8bf7\u6c42\u62a5\u6587\u5305\u62ec\u8d77\u59cb\u884c\u3001\u9996\u90e8\u548c\u4e3b\u4f53\u90e8\u5206<\/p>\n\n\n\n

\u3000\u3000\u5982\u679c\u8bbf\u95ee\u7684google.com\uff0c\u5219\u8d77\u59cb\u884c\u53ef\u80fd\u5982\u4e0b<\/p>\n\n\n\n

GET https:\/\/www.google.com\/ HTTP\/1.1<\/pre>\n\n\n\n
\u3000\u3000\u9996\u90e8\u5305\u62ec\u57df\u540dhost\u3001keep-alive\u3001User-Agent\u3001Accept-Encoding\u3001Accept-Language\u3001Cookie\u7b49\u4fe1\u606f\uff0c\u53ef\u80fd\u5982\u4e0b<\/p>\n\n\n\n
\"\u590d\u5236\u4ee3\u7801\"\/<\/a><\/figure>\n\n\n\n
Host: www.google.com\nConnection: keep-alive\nUpgrade-Insecure-Requests: 1\nUser-Agent: Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/65.0.3325.181 Safari\/537.36\nAccept: text\/html,application\/xhtml+xml,application\/xml;q=0.9,image\/webp,image\/apng,*\/*;q=0.8\nX-Client-Data: CKm1yQEIhbbJAQijtskBCMG2yQEIqZ3KAQioo8oB\nAccept-Encoding: gzip, deflate, br\nAccept-Language: zh-CN,zh;q=0.9,en;q=0.8<\/pre>\n\n\n\n
\"\u590d\u5236\u4ee3\u7801\"\/<\/a><\/figure>\n\n\n\n
\u3000\u3000\u9996\u90e8\u548c\u4e3b\u4f53\u5185\u5bb9\u4e4b\u95f4\u6709\u4e00\u4e2a\u56de\u8f66\u6362\u884c(CRLF)\uff0c\u4e3b\u4f53\u5185\u5bb9\u5373\u8981\u4f20\u8f93\u7684\u5185\u5bb9\u3002\u5982\u679c\u662fget\u8bf7\u6c42\uff0c\u5219\u4e3b\u4f53\u5185\u5bb9\u4e3a\u7a7a<\/p>\n\n\n\n
\u3000\u30003\u3001\u4f20\u8f93\u5c42\u5efa\u7acbTCP\u8fde\u63a5<\/p>\n\n\n\n
\u3000\u3000\u4f20\u8f93\u5c42\u4f20\u8f93\u534f\u8bae\u5206\u4e3aUDP\u548cTCP\u4e24\u79cd<\/p>\n\n\n\n
\u3000\u3000UDP\u662f\u65e0\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u800cTCP\u662f\u53ef\u9760\u7684\u6709\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u4e3b\u8981\u8868\u73b0\u5728\uff1a\u63a5\u6536\u65b9\u4f1a\u5bf9\u6536\u5230\u7684\u6570\u636e\u8fdb\u884c\u786e\u8ba4\u3001\u53d1\u9001\u65b9\u4f1a\u91cd\u4f20\u63a5\u6536\u65b9\u672a\u786e\u8ba4\u7684\u6570\u636e\u3001\u63a5\u6536\u65b9\u4f1a\u5c06\u63a5\u6536\u5230\u6570\u636e\u6309\u6b63\u786e\u7684\u987a\u5e8f\u91cd\u65b0\u6392\u5e8f\uff0c\u5e76\u5220\u9664\u91cd\u590d\u7684\u6570\u636e\u3001\u63d0\u4f9b\u4e86\u63a7\u5236\u62e5\u6324\u7684\u673a\u5236<\/p>\n\n\n\n
\u3000\u3000\u7531\u4e8eHTTP\u534f\u8bae\u4f7f\u7528\u7684\u662fTCP\u534f\u8bae\uff0c\u4e3a\u4e86\u65b9\u4fbf\u901a\u4fe1\uff0c\u5c06HTTP\u8bf7\u6c42\u62a5\u6587\u6309\u5e8f\u53f7\u5206\u4e3a\u591a\u4e2a\u62a5\u6587\u6bb5(segment)\uff0c\u5e76\u5bf9\u6bcf\u4e2a\u62a5\u6587\u6bb5\u8fdb\u884c\u5c01\u88c5\u3002\u4f7f\u7528\u672c\u5730\u4e00\u4e2a\u5927\u4e8e1024\u4ee5\u4e0a\u7684\u968f\u673aTCP\u6e90\u7aef\u53e3(\u8fd9\u91cc\u5047\u8bbe\u662f1030)\u5efa\u7acb\u5230\u76ee\u7684\u670d\u52a1\u5668TCP80\u53f7\u7aef\u53e3(HTTPS\u534f\u8bae\u5bf9\u5e94\u7684\u7aef\u53e3\u53f7\u662f443)\u7684\u8fde\u63a5\uff0cTCP\u6e90\u7aef\u53e3\u548c\u76ee\u7684\u7aef\u53e3\u88ab\u52a0\u5165\u5230\u62a5\u6587\u6bb5\u4e2d\uff0c\u5b66\u540d\u53eb\u534f\u8bae\u6570\u636e\u5355\u5143(Protocol Data Unit, PDU)\u3002\u56e0TCP\u662f\u4e00\u4e2a\u53ef\u9760\u7684\u4f20\u8f93\u63a7\u5236\u534f\u8bae\uff0c\u4f20\u8f93\u5c42\u8fd8\u4f1a\u52a0\u5165\u5e8f\u5217\u53f7\u3001\u786e\u8ba4\u53f7\u3001\u7a97\u53e3\u5927\u5c0f\u3001\u6821\u9a8c\u548c\u7b49\u53c2\u6570\uff0c\u5171\u6dfb\u52a020\u5b57\u8282\u7684\u5934\u90e8\u4fe1\u606f<\/p>\n\n\n\n
\"http\"\/<\/figure>\n\n\n\n
\u3000\u3000TCP\u534f\u8bae\u662f\u9762\u5411\u8fde\u63a5\u7684\uff0c\u6240\u4ee5\u5b83\u5728\u5f00\u59cb\u4f20\u8f93\u6570\u636e\u4e4b\u524d\u9700\u8981\u5148\u5efa\u7acb\u8fde\u63a5\u3002\u8981\u5efa\u7acb\u6216\u521d\u59cb\u5316\u4e00\u4e2a\u8fde\u63a5\uff0c\u4e24\u7aef\u4e3b\u673a\u5fc5\u987b\u540c\u6b65\u53cc\u65b9\u7684\u521d\u59cb\u5e8f\u53f7\u3002\u540c\u6b65\u662f\u901a\u8fc7\u4ea4\u6362\u8fde\u63a5\u5efa\u7acb\u6570\u636e\u5206\u6bb5\u548c\u521d\u59cb\u5e8f\u53f7\u6765\u5b8c\u6210\u7684\uff0c\u5728\u8fde\u63a5\u5efa\u7acb\u6570\u636e\u5206\u6bb5\u4e2d\u5305\u542b\u4e00\u4e2aSYN(\u540c\u6b65)\u7684\u63a7\u5236\u4f4d\u3002\u540c\u6b65\u9700\u8981\u53cc\u65b9\u90fd\u53d1\u9001\u81ea\u5df1\u7684\u521d\u59cb\u5e8f\u53f7\uff0c\u5e76\u4e14\u53d1\u9001\u786e\u8ba4\u7684ACK\u3002\u6b64\u8fc7\u7a0b\u5c31\u662f\u4e09\u6b21\u63e1\u624b<\/p>\n\n\n\n
\u3000\u3000\u7b2c\u4e00\u6b21\u63e1\u624b\uff1a\u4e3b\u673aA\u53d1\u5f80\u4e3b\u673aB\uff0c\u4e3b\u673aA\u7684\u521d\u59cb\u5e8f\u53f7\u662fX\uff0c\u8bbe\u7f6eSYN\u4f4d\uff0c\u672a\u8bbe\u7f6eACK\u4f4d<\/p>\n\n\n\n
\u3000\u3000\u7b2c\u4e8c\u6b21\u63e1\u624b\uff1a\u4e3b\u673aB\u53d1\u5f80\u4e3b\u673aA\uff0c\u4e3b\u673aB\u7684\u521d\u59cb\u5e8f\u53f7\u662fY\uff0c\u786e\u8ba4\u53f7(ACK)\u662fX+1\uff0cX+1\u786e\u8ba4\u53f7\u6697\u793a\u5df1\u7ecf\u6536\u5230\u4e3b\u673aA\u53d1\u5f80\u4e3b\u673aB\u7684\u540c\u6b65\u5e8f\u53f7\u3002\u8bbe\u7f6eSYN\u4f4d\u548cACK\u4f4d<\/p>\n\n\n\n
\u3000\u3000\u7b2c\u4e09\u6b21\u63e1\u624b\uff1a\u4e3b\u673aA\u53d1\u5f80\u4e3b\u673aB\uff0c\u4e3b\u673aA\u7684\u5e8f\u53f7\u662fX+1\uff0c\u786e\u8ba4\u53f7\u662fY+1\uff0cY+1\u786e\u8ba4\u53f7\u6697\u793a\u5df2\u7ecf\u6536\u5230\u4e3b\u673aB\u53d1\u5f80\u4e3b\u673aA\u7684\u540c\u6b65\u5e8f\u53f7\u3002\u8bbe\u7f6eACK\u4f4d\uff0c\u672a\u8bbe\u7f6eSYN\u4f4d<\/p>\n\n\n\n
\u3000\u3000\u4e09\u6b21\u63e1\u624b\u89e3\u51b3\u7684\u4e0d\u4ec5\u4ec5\u6709\u5e8f\u53f7\u95ee\u9898\uff0c\u8fd8\u89e3\u51b3\u4e86\u5305\u62ec\u7a97\u53e3\u5927\u5c0f\u3001MTU(Maximum Transmission Unit,\u6700\u5927\u4f20\u8f93\u5355\u5143)\uff0c\u4ee5\u53ca\u6240\u671f\u671b\u7684\u7f51\u7edc\u5ef6\u65f6\u7b49\u5176\u4ed6\u95ee\u9898<\/p>\n\n\n\n
\"http\"\/<\/figure>\n\n\n\n
\u3000\u3000\u6784\u5efaTCP\u8bf7\u6c42\u4f1a\u589e\u52a0\u5927\u91cf\u7684\u7f51\u7edc\u65f6\u5ef6\uff0c\u5e38\u7528\u7684\u4f18\u5316\u65b9\u5f0f\u5982\u4e0b\u6240\u793a<\/p>\n\n\n\n
\u3000\u3000\uff081\uff09\u8d44\u6e90\u6253\u5305\uff0c\u5408\u5e76\u8bf7\u6c42<\/p>\n\n\n\n
\u3000\u3000\uff082\uff09\u591a\u4f7f\u7528\u7f13\u5b58\uff0c\u51cf\u5c11\u7f51\u7edc\u4f20\u8f93<\/p>\n\n\n\n
\u3000\u3000\uff083\uff09\u4f7f\u7528keep-alive\u5efa\u7acb\u6301\u4e45\u8fde\u63a5<\/p>\n\n\n\n
\u3000\u3000\uff084\uff09\u4f7f\u7528\u591a\u4e2a\u57df\u540d\uff0c\u589e\u52a0\u6d4f\u89c8\u5668\u7684\u8d44\u6e90\u5e76\u53d1\u52a0\u8f7d\u6570\uff0c\u6216\u8005\u4f7f\u7528HTTP2\u7684\u7ba1\u9053\u5316\u8fde\u63a5\u7684\u591a\u8def\u590d\u7528\u6280\u672f<\/p>\n\n\n\n
\u3000\u30004\u3001\u7f51\u7edc\u5c42\u4f7f\u7528IP\u534f\u8bae\u6765\u9009\u62e9\u8def\u7ebf<\/p>\n\n\n\n
\u3000\u3000\u5904\u7406\u6765\u81ea\u4f20\u8f93\u5c42\u7684\u6570\u636e\u6bb5segment\uff0c\u5c06\u6570\u636e\u6bb5segment\u88c5\u5165\u6570\u636e\u5305packet\uff0c\u586b\u5145\u5305\u5934\uff0c\u4e3b\u8981\u5c31\u662f\u6dfb\u52a0\u6e90\u548c\u76ee\u7684IP\u5730\u5740\uff0c\u7136\u540e\u53d1\u9001\u6570\u636e\u3002\u5728\u6570\u636e\u4f20\u8f93\u7684\u8fc7\u7a0b\u4e2d\uff0cIP\u534f\u8bae\u8d1f\u8d23\u9009\u62e9\u4f20\u9001\u7684\u8def\u7ebf\uff0c\u79f0\u4e3a\u8def\u7531\u529f\u80fd<\/p>\n\n\n\n
\"http\"\/<\/figure>\n\n\n\n
\u3000\u30005\u3001\u6570\u636e\u94fe\u8def\u5c42\u5b9e\u73b0\u7f51\u7edc\u76f8\u90bb\u7ed3\u70b9\u95f4\u53ef\u9760\u7684\u6570\u636e\u901a\u4fe1<\/p>\n\n\n\n
\u3000\u3000\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u4f20\u8f93\uff0c\u628a\u6570\u636e\u5305packet\u5c01\u88c5\u6210\u5e27(Frame)\uff0c\u5e76\u6309\u987a\u5e8f\u4f20\u9001\u5404\u5e27\u3002\u7531\u4e8e\u7269\u7406\u7ebf\u8def\u7684\u4e0d\u53ef\u9760\uff0c\u53d1\u51fa\u7684\u6570\u636e\u5e27\u6709\u53ef\u80fd\u5728\u7ebf\u8def\u4e0a\u51fa\u9519\u6216\u4e22\u5931\uff0c\u4e8e\u662f\u4e3a\u6bcf\u4e2a\u6570\u636e\u5206\u5757\u8ba1\u7b97\u51faCRC(\u5faa\u73af\u5197\u4f59\u68c0\u9a8c)\uff0c\u5e76\u628aCRC\u6dfb\u52a0\u5230\u5e27\u4e2d\uff0c\u8fd9\u6837\u63a5\u6536\u65b9\u5c31\u53ef\u4ee5\u901a\u8fc7\u91cd\u65b0\u8ba1\u7b97CRC\u6765\u5224\u65ad\u6570\u636e\u63a5\u6536\u7684\u6b63\u786e\u6027\u3002\u4e00\u65e6\u51fa\u9519\u5c31\u91cd\u4f20<\/p>\n\n\n\n
\u3000\u3000\u5c06\u6570\u636e\u5305packet\u5c01\u88c5\u6210\u5e27(Frame)\uff0c\u5305\u62ec\u5e27\u5934\u548c\u5e27\u5c3e\u3002\u5e27\u5c3e\u662f\u6dfb\u52a0\u88ab\u79f0\u505aCRC\u7684\u5faa\u73af\u5197\u4f59\u6821\u9a8c\u90e8\u5206\u3002\u5e27\u5934\u4e3b\u8981\u662f\u6dfb\u52a0\u6570\u636e\u94fe\u8def\u5c42\u7684\u5730\u5740\uff0c\u5373\u6570\u636e\u94fe\u8def\u5c42\u7684\u6e90\u5730\u5740\u548c\u76ee\u7684\u5730\u5740\uff0c\u5373\u7f51\u7edc\u76f8\u90bb\u7ed3\u70b9\u95f4\u7684\u6e90MAC\u5730\u5740\u548c\u76ee\u7684MAC\u5730\u5740<\/p>\n\n\n\n
\u3000\u30006\u3001\u7269\u7406\u5c42\u4f20\u8f93\u6570\u636e<\/p>\n\n\n\n
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\"http\"\/<\/figure>\n\n\n\n
\u7f51\u7edc\u4f20\u8f93<\/h3>\n\n\n\n
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\u3010\u8def\u7531\u5668\u3011<\/p>\n\n\n\n
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\"http\"\/<\/figure>\n\n\n\n
\u670d\u52a1\u5668\u5904\u7406\u53ca\u53cd\u5411\u4f20\u8f93<\/h3>\n\n\n\n
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\u6d4f\u89c8\u5668\u6e32\u67d3<\/h3>\n\n\n\n
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\u3000\u30002\u3001\u6d4f\u89c8\u5668\u5904\u7406HTTP\u54cd\u5e94\u62a5\u6587\u4e2d\u7684\u4e3b\u4f53\u5185\u5bb9\uff0c\u9996\u5148\u4f7f\u7528loader\u6a21\u5757\u52a0\u8f7d\u76f8\u5e94\u7684\u8d44\u6e90<\/p>\n\n\n\n
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\u3000\u3000\u4e3b\u8d44\u6e90\u5230\u8fbe\u540e\uff0c\u6d4f\u89c8\u5668\u7684Parser\u6a21\u5757\u89e3\u6790\u4e3b\u8d44\u6e90\u7684\u5185\u5bb9\uff0c\u751f\u6210\u6d3e\u751f\u8d44\u6e90\u5bf9\u5e94\u7684DOM\u7ed3\u6784\uff0c\u7136\u540e\u6839\u636e\u9700\u6c42\u89e6\u53d1\u6d3e\u751f\u8d44\u6e90\u7684\u52a0\u8f7d\u6d41\u7a0b\u3002\u6bd4\u5982\uff0c\u5728\u89e3\u6790\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u9047\u5230img\u7684\u8d77\u59cb\u6807\u7b7e\uff0c\u4f1a\u521b\u5efa\u76f8\u5e94\u7684image\u5143\u7d20HTMLImageElement\uff0c\u63a5\u7740\u4f9d\u636eimg\u6807\u7b7e\u7684\u5185\u5bb9\u8bbe\u7f6eHTMLImageElement\u7684\u5c5e\u6027\u3002\u5728\u8bbe\u7f6esrc\u5c5e\u6027\u65f6\uff0c\u4f1a\u89e6\u53d1\u56fe\u7247\u8d44\u6e90\u52a0\u8f7d\uff0c\u53d1\u8d77\u52a0\u8f7d\u8d44\u6e90\u8bf7\u6c42<\/p>\n\n\n\n
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\u3000\u30003\u3001\u4f7f\u7528parse\u6a21\u5757\u89e3\u6790HTML\u3001CSS\u3001Javascript\u8d44\u6e90<\/p>\n\n\n\n
\u3010\u89e3\u6790HTML\u3011<\/p>\n\n\n\n
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\u3000\u3000\uff082\uff09\u5206\u8bcd\uff1a\u6309\u7167\u4e00\u5b9a\u7684\u5207\u8bcd\u89c4\u5219\uff0c\u5c06Unicode\u5b57\u7b26\u6d41\u5207\u6210\u4e00\u4e2a\u4e2a\u7684\u8bcd\u8bed(Tokens)<\/p>\n\n\n\n
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\u3000\u3000\uff084\uff09\u5efa\u6811\uff1a\u5c06\u8282\u70b9\u5173\u8054\u5230\u4e00\u8d77\uff0c\u521b\u5efaDOM\u6811<\/p>\n\n\n\n
\u3010\u89e3\u6790CSS\u3011<\/p>\n\n\n\n
\u3000\u3000\u9875\u9762\u4e2d\u6240\u6709\u7684CSS\u7531\u6837\u5f0f\u8868CSSStyleSheet\u96c6\u5408\u6784\u6210\uff0c\u800cCSSStyleSheet\u662f\u4e00\u7cfb\u5217CSSRule\u7684\u96c6\u5408\uff0c\u6bcf\u4e00\u6761CSSRule\u5219\u7531\u9009\u62e9\u5668CSSStyleSelector\u90e8\u5206\u548c\u58f0\u660eCSSStyleDeclaration\u90e8\u5206\u6784\u6210\uff0c\u800cCSSStyleDeclaration\u662fCSS\u5c5e\u6027\u548c\u503c\u7684Key-Value\u96c6\u5408<\/p>\n\n\n\n
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\"http\"\/<\/figure>\n\n\n\n
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