{"id":15820,"date":"2024-07-10T11:04:53","date_gmt":"2024-07-10T03:04:53","guid":{"rendered":"https:\/\/92it.top\/?p=15820"},"modified":"2024-07-10T11:04:53","modified_gmt":"2024-07-10T03:04:53","slug":"%e4%b8%80%e6%96%87%e6%90%9e%e6%87%82html-%e6%b8%b2%e6%9f%93%e9%82%a3%e4%ba%9b%e4%ba%8b%e5%84%bf%ef%bc%81","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=15820","title":{"rendered":"\u4e00\u6587\u641e\u61c2HTML \u6e32\u67d3\u90a3\u4e9b\u4e8b\u513f\uff01"},"content":{"rendered":"\n

\u8f6c\u8f7d\uff1a\u4e00\u6587\u641e\u61c2HTML \u6e32\u67d3\u90a3\u4e9b\u4e8b\u513f\uff01<\/a><\/p>\n\n\n\n

\u5bfc\u8bfb<\/strong><\/p>\n\n\n\n

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    \n
  • \u300c\u6d4f\u89c8\u5668\u662f\u5982\u4f55\u5c06\u6211\u4eec\u7684 HTML \u6e32\u67d3\u5230\u5c4f\u5e55\u4e0a\u7684\u3002\u300d<\/strong><\/li>\n\n\n\n
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    <!DOCTYPE html>\n<html>\n  <head>\n    <meta name=\"viewport\" content=\"width=device-width,initial-scale=1\" \/>\n    <link href=\"style.css\" rel=\"stylesheet\" \/>\n    <title>Critical Path<\/title>\n  <\/head>\n  <body>\n    <p>Hello <span>web performance<\/span> students!<\/p>\n    <div><img src=\"awesome-photo.jpg\" \/><\/div>\n  <\/body>\n<\/html><\/pre>\n\n\n\n
    \u6784\u9020\u6587\u6863\u5bf9\u8c61\u6a21\u578b(Dom)<\/strong><\/p>\n\n\n\n
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      \n
    1. \u300c\u8f6c\u5316\u300d<\/strong>\u9996\u5148\u6d4f\u89c8\u5668\u4ece\u78c1\u76d8\uff08\u7f13\u5b58\uff09\u6216\u7f51\u7edc\u8bfb\u53d6 HTML \u7684\u539f\u59cb\u5b57\u8282\uff0c\u5e76\u6839\u636e\u6587\u4ef6\u7684\u6307\u5b9a\u7f16\u7801\uff08\u4f8b\u5982 UTF-8\uff09\u5c06\u5b83\u4eec\u8f6c\u6362\u4e3a\u5355\u4e2a\u5b57\u7b26\u3002<\/li>\n\n\n\n
    2. \u300c\u5206\u8bcd\uff08\u8bcd\u6cd5\u5206\u6790\uff09\u300d<\/strong>\u63a5\u4e0b\u6765\u6d4f\u89c8\u5668\u4f1a\u5c06\u4e0a\u4e00\u6b65\u9aa4\u5f97\u5230\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e00\u4e2a\u4e00\u4e2a Token \u2014\u2014\u5982W3C HTML5 \u6807\u51c6\u6240\u6307\u5b9a\u7684\uff0c\u4f8b\u5982<html><\/code>\u3001<body><\/code>\u2014\u2014\u4ee5\u53ca\u5c16\u62ec\u53f7\u5185\u7684\u5176\u4ed6\u5b57\u7b26\u4e32\u3002\u6bcf\u4e2a Token \u90fd\u6709\u7279\u6b8a\u7684\u542b\u4e49\u548c\u81ea\u5df1\u7684\u4e00\u5957\u89c4\u5219\u3002<\/li>\n\n\n\n
    3. \u300c\u5206\u6790\uff08\u8bed\u6cd5\u5206\u6790\uff09\u300d<\/strong>\u6d4f\u89c8\u5668\u4f1a\u5c06\u4e0a\u4e00\u6b65\u7684\u5230\u7684 Tokens \u8f6c\u6362\u4e3a\u4e00\u4e2a \u201c\u5bf9\u8c61\u201d\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u5b9a\u4e49\u4e86\u5b83\u4eec\u7684\u5c5e\u6027\u548c\u89c4\u5219\u3002<\/li>\n\n\n\n
    4. \u300c\u6784\u9020 DomTree\u300d<\/strong>\u6784\u9020\u6587\u6863\u5bf9\u8c61\u6a21\u578b\u7684\u6700\u540e\u4e00\u6b65\u5c31\u662f\u6784\u5efa DomTree\u3002\u56e0\u4e3a HTML \u4e2d\u5b9a\u4e49\u4e86\u4e0d\u540c\u6807\u7b7e\u4e4b\u95f4\u7684\u5173\u7cfb\uff08\u4e00\u4e9b\u6807\u7b7e\u5305\u542b\u5728\u5176\u4ed6\u6807\u7b7e\u4e2d\u7b49\u7b49\uff09\uff0c\u6240\u4ee5\u6700\u7ec8\u6d4f\u89c8\u5668\u7684\u5230\u7684\u5bf9\u8c61\u662f\u4e00\u4e2a\u6811\u578b\u7ed3\u6784\uff0c\u8be5\u7ed3\u6784\u4e2d\u901a\u8fc7\u5d4c\u5957\u7b49\u5173\u7cfb\u63cf\u8ff0\u4e86\u6587\u6863\u4e2d\u4e0d\u540c\u6807\u7b7e\u7684\u5173\u7cfb\u3002<\/li>\n<\/ol>\n\n\n
      \n
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      body {\n  font-size: 16px;\n}\np {\n  font-weight: bold;\n}\nspan {\n  color: red;\n}\np span {\n  display: none;\n}\nimg {\n  float: right;\n}<\/pre>\n\n\n\n
      Css \u7684\u5904\u7406\u548c HTML \u5dee\u4e0d\u591a\uff0c\u6d4f\u89c8\u5668\u4e5f\u9700\u8981\u5c06\u63a5\u6536\u5230\u7684 CSS \u89c4\u5219\u8f6c\u6362\u4e3a\u6d4f\u89c8\u5668\u53ef\u4ee5\u7406\u89e3\u548c\u4f7f\u7528\u7684\u5185\u5bb9\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8e Css \u6d4f\u89c8\u5668\u4ecd\u7136\u4f1a\u91cd\u590d\u4e0a\u8ff0\u7684 4 \u4e2a\u8fc7\u7a0b\uff1a<\/p>\n\n\n
      \n
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      \u5176\u5b9e\uff0c\u7ed3\u8bba\u5e76\u4e0d\u662f\u8fd9\u6837\u7684\u3002<\/p>\n\n\n\n
      \u300c\u5982\u679c\u4f60\u7684 css \u662f\u5199\u5728 style \u6807\u7b7e\u4e2d\uff0c\u90a3\u4e48\u5728 chrome \u4e2d style \u6807\u7b7e\u4f1a\u88ab Html Parse \u6765\u89e3\u6790\u3002\u300d<\/strong><\/p>\n\n\n\n
      \u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u7684 css \u6587\u4ef6\u90fd\u4f1a\u4f7f\u7528\u5916\u90e8\u94fe\u63a5\u7684\u65b9\u5f0f\u8fdb\u884c\u5f15\u5165\uff0c\u5f53\u4f7f\u7528 link \u6807\u7b7e\u5f15\u5165 Css \u6587\u4ef6\u65f6\u3002<\/p>\n\n\n\n
      \u7531\u4e8e Cssom \u7684\u751f\u6210\u65f6\u673a\u5e76\u4e0d\u4f1a\u5f71\u54cd DomTree \u7684\u6539\u53d8\uff08JS \u6587\u4ef6\u6709\u53ef\u80fd\u4f1a\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 JS \u4fee\u6539\u64cd\u7eb5 Dom\uff09\uff0c\u81ea\u7136\u5f53 HTML Parse \u9047\u5230 link \u6807\u7b7e\u7684 stylesheet \u65f6\u5e76\u4e0d\u4f1a\u7b49\u5f85 stylesheet \u4e0b\u8f7d\u5e76\u89e3\u6790\u5b8c\u6bd5\u540e\u624d\u4f1a\u89e3\u6790\u540e\u7eed Dom\u3002<\/p>\n\n\n\n
      \u800c\u662f\u5728\u7f51\u7edc\u8fdb\u7a0b\u52a0\u8f7d style \u811a\u672c\u7684\u540c\u65f6\u53ef\u4ee5\u7ee7\u7eed\u53bb\u89e3\u6790\u540e\u7eed Dom\uff0c\u8fd9\u662f\u6240\u8c13\u7684 Dom \u548c Cssom \u7684\u5e76\u884c\u5173\u7cfb\uff08\u6216\u8005\u4e25\u683c\u6765\u8bf4\u7684\u975e\u963b\u585e\u5173\u7cfb\uff09\u3002<\/p>\n\n\n\n
      \u800c\u5f53\u7f51\u7edc\u8fdb\u7a0b\u52a0\u8f7d\u5b8c\u6837\u5f0f\u811a\u672c\u540e\uff0c\u4e3b\u7ebf\u7a0b\u4e2d\u4ecd\u7136\u9700\u8981\u5b58\u5728\u4e00\u4e2a parse styleSheet \u7684\u64cd\u4f5c\uff0c\u8fd9\u4e00\u6b65\u5c31\u662f\u89e3\u6790 link \u811a\u672c\u4e2d\u7684\u6837\u5f0f\u5185\u5bb9\u4ece\u800c\u751f\u6210\uff08\u6dfb\u52a0\uff09Cssom \u4e0a\u7684\u8282\u70b9\u3002<\/p>\n\n\n\n
      \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6240\u8c13 parse styleSheet \u7684\u64cd\u4f5c\u662f\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u8fdb\u884c\u64cd\u4f5c\u7684\u3002\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\u5b83\u4f1a\u548c parse Html \u62a2\u5360\u4e3b\u7ebf\u7a0b\u8d44\u6e90\uff08\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u8fdb\u884c\u4e00\u4e2a\u64cd\u4f5c\uff09\u3002<\/p>\n\n\n\n
      \u300c\u6240\u4ee5\uff0c\u901a\u5e38\u6211\u4eec\u6240\u8bf4 Dom \u548c Cssom \u751f\u6210\u7684\u975e\u963b\u585e\u66f4\u591a\u7684\u662f\u6307\u52a0\u8f7d\u6837\u5f0f\u811a\u672c\u5e76\u4e0d\u4f1a\u963b\u585e\u540e\u7eed Dom \u89e3\u6790\uff08\u8fd9\u91cc\u7684\u975e\u963b\u585e\u66f4\u591a\u76f8\u5bf9\u4e8e JS \u6587\u4ef6\u6765\u8bf4\uff0c\u56e0\u4e3a\u540c\u6b65 JS \u6587\u4ef6\u7684\u52a0\u8f7d\u662f\u4f1a\u963b\u585e\u540e\u7eed Dom \u6784\u5efa\u7684\uff09\uff0c\u800c\u4e3b\u7ebf\u7a0b\u89e3\u6790\u751f\u6210 cssom \u7684\u8fc7\u7a0b\u4e00\u5b9a\u662f\u4f1a\u548c parse Html \u62a2\u5360\u4e3b\u7ebf\u7a0b\u8d44\u6e90\u7684\uff08\u4e3b\u7ebf\u7a0b\u5e76\u4e0d\u4f1a\u540c\u65f6 parse Html \u4ee5\u53ca\u540c\u65f6 parse stylesheet\uff09\u3002\u300d<\/strong><\/p>\n\n\n\n
      \u751f\u6210\u6e32\u67d3\u6811<\/strong><\/p>\n\n\n\n
      \u4e0a\u8ff0\u7684\u4e24\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u57fa\u4e8e HTML \u548c CSS \u5206\u522b\u7684\u5230\u4e86 DomTree \u4ee5\u53ca CssomTree\u3002\u5f53\u7136\uff0c\u6b64\u65f6\u8fd9\u4e24\u68f5\u6811\u90fd\u662f\u4e92\u76f8\u72ec\u7acb\u7684\u4e24\u4e2a\u6811\u72b6\u5bf9\u8c61\u3002<\/p>\n\n\n\n
      DomTree \u63cf\u8ff0\u4e86\u9875\u9762\u4e2d\u6240\u6709\u7684 Dom \u7ed3\u6784\u5185\u5bb9\uff0cCssTree \u63cf\u8ff0\u4e86\u9700\u8981\u5e94\u7528\u5728\u9875\u9762\u8282\u70b9\u4e0a\u7684\u6837\u5f0f\u89c4\u5219\u3002<\/p>\n\n\n\n
      \u63a5\u4e0b\u6765\uff0c\u8981\u5c06\u4e00\u4e2a\u5b8c\u6574\u7684\u9875\u9762\u6e32\u67d3\u7ed9\u7528\u6237\uff0c\u81ea\u7136\u6d4f\u89c8\u5668\u9700\u8981\u505a\u7684\u662f\u5c06\u4e24\u8005\u8fdb\u884c\u5408\u5e76\u3002<\/p>\n\n\n\n
      \u4e0a\u8ff0\u7684\u8fc7\u7a0b\u7ed3\u675f\u540e\uff0c\u6d4f\u89c8\u5668\u4f1a\u5c06\u4e24\u4e2a Tree \u8fdb\u884c\u5408\u5e76\uff0c\u6700\u7ec8\u7ec4\u6210\u4e00\u4e2a\u5177\u6709\u6240\u6709\u300c\u53ef\u89c1\u300d<\/strong>\u8282\u70b9\u6837\u5f0f\u548c\u5185\u5bb9\u7684 Render Tree \u3002<\/p>\n\n\n
      \n
      \"\"<\/figure><\/div>\n\n\n
      \u4e0a\u8ff0\u6e32\u67d3\u6811\u7684\u6784\u5efa\u8fc7\u7a0b\u5927\u6982\u5206\u4e3a\u4ee5\u4e0b\u4e09\u4e2a\u6b65\u9aa4\uff1a<\/p>\n\n\n\n
        \n
      1. \u4ece DomTree \u5f00\u59cb\u904d\u5386\uff0c\u904d\u5386\u6bcf\u4e00\u4e2a\u53ef\u89c1\u8282\u70b9\u3002\n
          \n
        • \u4e00\u4e9b\u811a\u672c\u6807\u7b7e\u3001\u5143\u6807\u7b7e\u7b49\u8282\u70b9\u662f\u4e0d\u53ef\u89c1\u7684\uff0c\u7531\u4e8e\u5b83\u4eec\u672a\u53cd\u6620\u5728\u9875\u9762\u7684\u5448\u73b0\u4e2d\u6240\u4ee5\u4f1a\u88ab\u88ab\u7701\u7565\u3002<\/li>\n\n\n\n
        • \u540c\u65f6\u5bf9\u4e8e\u4e00\u4e9b\u901a\u8fc7 CSS \u9690\u85cf\u7684\u8282\u70b9\uff0c\u4e5f\u4f1a\u4ece\u6e32\u67d3\u6811\u4e2d\u7701\u7565\u3002\u6bd4\u5982\uff0c\u4e0a\u8ff0 HTML \u4e2d\u7684 span \u8282\u70b9\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u4f1a\u5728\u6e32\u67d3\u6811\u4e2d\u4e22\u5931\uff0c\u56e0\u4e3a\u5b83\u660e\u786e\u7684\u8bbe\u7f6e\u4e86 \u201cdisplay: none\u201d \u5c5e\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • \u5bf9\u4e8e DomTree \u4e2d\u7684\u6bcf\u4e2a\u53ef\u89c1\u8282\u70b9\uff0c\u5728 Cssom \u4e2d\u627e\u5230\u5408\u9002\u7684\u5339\u914d CSSOM \u89c4\u5219\u5e76\u5e94\u7528\u5b83\u4eec\u3002<\/li>\n\n\n\n
        • \u6700\u7ec8\u5728 Render Tree \u4e0a\u6302\u8f7d\u8fd9\u4e9b\u5e26\u6709\u5185\u5bb9\u4ee5\u53ca\u6837\u5f0f\u7684\u53ef\u89c1\u8282\u70b9\u3002<\/li>\n<\/ol>\n\n\n\n
          \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4e0d\u53ef\u89c1\u5143\u7d20\u5e76\u4e0d\u4ee3\u8868\u4e0d\u80fd\u88ab\u770b\u5230\u7684\u5143\u7d20\u3002\u6bd4\u5982 visibility: hidden \u4e0d\u540c\u4e8e display: none. \u524d\u8005\u4f7f\u5143\u7d20\u4e0d\u53ef\u89c1\uff0c\u4f46\u5143\u7d20\u5728\u5e03\u5c40\u4e2d\u4ecd\u7136\u5360\u636e\u7a7a\u95f4\uff08\u6e32\u67d3\u4e3a\u7a7a\u6846\uff09\uff0c\u800c\u540e\u8005display: none\u8868\u793a\u5c06\u5143\u7d20\u4ece\u6e32\u67d3\u6811\u4e2d\u5b8c\u5168\u79fb\u9664\uff0c\u4f7f\u5143\u7d20\u4e0d\u53ef\u89c1\u4ece\u800c\u4e0d\u662f\u5e03\u5c40\u7684\u4e00\u90e8\u5206\u3002<\/pre>\n\n\n\n
          \u6700\u7ec8\uff0c\u7ecf\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\u6d4f\u89c8\u5668\u4f1a\u7ec4\u88c5 DomTree \u548c CssomTree \u6210\u4e3a RenderTree\uff0cRenderTree \u4e2d\u5305\u542b\u5c4f\u5e55\u4e0a\u6240\u6709\u53ef\u89c1\u5185\u5bb9\u7684\u5185\u5bb9\u548c\u6837\u5f0f\u4fe1\u606f<\/p>\n\n\n\n
          \u5e03\u5c40<\/strong><\/p>\n\n\n\n
          \u5728 RenderTree \u6784\u5efa\u5b8c\u6bd5\u540e\uff0c\u63a5\u4e0b\u6765\u5c31\u4f1a\u8fdb\u5165\u5e03\u5c40 Layout \u9636\u6bb5\u4e86\u3002<\/p>\n\n\n\n
          \u5f97\u5230 RenderTree \u540e\uff0c\u6d4f\u89c8\u5668\u5df2\u7ecf\u660e\u786e\u7684\u6e05\u695a\u54ea\u4e9b\u8282\u70b9\u5e94\u8be5\u88ab\u6e32\u67d3\u5230\u9875\u9762\u4e0a\u540c\u4e8b\u4e5f\u83b7\u5f97\u4e86\u53ef\u89c1\u8282\u70b9\u7684\u6837\u5f0f\u3002<\/p>\n\n\n\n
          \u4f46\u662f\uff0c\u6b64\u65f6\u6d4f\u89c8\u5668\u5e76\u672a\u8ba1\u7b97\u51fa\u6bcf\u4e2a\u8282\u70b9\u5728\u5bf9\u5e94\u8bbe\u5907\uff08\u5c4f\u5e55\uff09\u4e0a\u786e\u5207\u7684\u4f4d\u7f6e\u548c\u5927\u5c0f\u3002\u8fd9\u4e00\u6b65\u4e5f\u5c31\u6240\u8c13\u5e03\u5c40\uff08Layout\uff09\u9636\u6bb5\u5e94\u8be5\u5904\u7406\u7684\u4e8b\u60c5\u3002<\/p>\n\n\n\n
          \u5e03\u5c40\u8fc7\u7a0b\u7684\u8f93\u51fa\u662f\u4e00\u4e2a\u201c\u76d2\u5b50\u6a21\u578b\u201d\uff0c\u5b83\u7cbe\u786e\u5730\u6355\u83b7\u89c6\u53e3\u5185\u6bcf\u4e2a\u5143\u7d20\u7684\u786e\u5207\u4f4d\u7f6e\u548c\u5927\u5c0f\uff1a\u300c\u6240\u6709\u76f8\u5bf9\u6d4b\u91cf\u503c\u90fd\u8f6c\u6362\u4e3a\u5c4f\u5e55\u4e0a\u7684\u7edd\u5bf9\u50cf\u7d20\u3002\u300d<\/strong><\/p>\n\n\n\n
          \u7ed8\u5236<\/strong><\/p>\n\n\n\n
          \u4e00\u65e6\u6e32\u67d3\u6811\u521b\u5efa\u5e76\u4e14\u5e03\u5c40\u5b8c\u6210\uff0c\u50cf\u7d20\u5c31\u53ef\u4ee5\u88ab\u7ed8\u5236\u5728\u5c4f\u5e55\u4e0a\uff0c\u65e2\u7136\u6d4f\u89c8\u5668\u5df2\u7ecf\u660e\u786e\u7684\u77e5\u9053\u54ea\u4e9b\u8282\u70b9\u662f\u53ef\u89c1\u7684\uff0c\u4ee5\u53ca\u5b83\u4eec\u7684\u6837\u5f0f\u548c\u51e0\u4f55\u5f62\u72b6\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u6b64\u4fe1\u606f\u4f20\u9012\u5230\u6700\u540e\u9636\u6bb5\uff0c\u5b83\u5c06 RenderTree \u4e2d\u7684\u6bcf\u4e2a\u8282\u70b9\u8f6c\u6362\u4e3a\u5c4f\u5e55\u4e0a\u7684\u5b9e\u9645\u50cf\u7d20\uff0c\u6b64\u6b65\u9aa4\u901a\u5e38\u79f0\u4e3a\u201cPaint\u201d\u3002<\/p>\n\n\n\n
          \u7ecf\u8fc7\u7ed8\u5236\u9636\u6bb5\uff0c\u6700\u7ec8\u6d4f\u89c8\u5668\u4e2d\u4f1a\u5448\u73b0\u51fa HTML \u6e32\u67d3\u5b8c\u6bd5\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
          \u4e0a\u8ff0\u6211\u4eec\u7b80\u5355\u7684\u63cf\u8ff0\u4e86\u4e00\u6b21\u5173\u952e\u6e32\u67d3\u8def\u5f84\u6240\u53d1\u751f\u7684\u4e8b\u60c5\uff1a<\/p>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u5f53\u7136\uff0c\u8fd9\u4e4b\u4e2d\u6709\u975e\u5e38\u591a\u5176\u4ed6\u503c\u5f97\u6df1\u7a76\u7684\u70b9\uff0c\u6bd4\u5982 Composite \u9636\u6bb5\u7684\u4e0d\u540c Layer \u5c42\u4e4b\u7c7b\u7b49\u7b49\u3002<\/p>\n\n\n\n
          \u7f51\u7edc\u4e0a\u76f8\u5173\u5173\u952e\u6e32\u67d3\u8def\u5f84\u7684\u6587\u7ae0\u5df2\u7ecf\u975e\u5e38\u591a\u4e86\uff0c\u8fd9\u91cc\u6211\u5c31\u4e0d\u8fc7\u4e8e\u7d2f\u8d58\u4e86\u3002<\/p>\n\n\n\n
          \u8fd9\u90e8\u5206\u5185\u5bb9\u4e3b\u8981\u662f\u60f3\u8ba9\u5927\u5bb6\u5bf9\u4e8e\u4e00\u6b21\u6d4f\u89c8\u5668\u6e32\u67d3\u53d1\u751f\u7684\u4e8b\u60c5\u6709\u4e00\u4e2a\u5927\u6982\u7684\u8ba4\u77e5\uff0c\u65b9\u4fbf\u6211\u4eec\u7ee7\u7eed\u540e\u7eed\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n
          JavaScript \u5230\u5e95\u4f1a\u4e0d\u4f1a\u963b\u585e\u4f60\u7684\u9875\u9762\u6e32\u67d3\uff1f<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          \u4e0a\u8fb9\u7684\u7ae0\u8282\u6211\u4eec\u7b80\u5355\u804a\u4e86\u804a\u4e00\u6b21\u6d4f\u89c8\u5668\u6e32\u67d3\u7a76\u7adf\u4f1a\u53d1\u751f\u54ea\u4e9b\u6b65\u9aa4\u3002<\/p>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u5b9e\u5728\u662f\u61d2\u7684\u753b\u4e86\uff0c\u8fd9\u662f\u6211\u4ece\u7f51\u7edc\u4e0a\u642c\u8fd0\u8fc7\u6765\u7684\u4e00\u5f20\u56fe\uff0c\u6d4f\u89c8\u5668\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u591a\u8fdb\u7a0b\u6a21\u578b\uff0c\u4e0a\u8ff0\u7684\u6e32\u67d3\u8fc7\u7a0b\u662f\u4f1a\u53d1\u751f\u5728\u6d4f\u89c8\u5668\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u6e32\u67d3\u7ebf\u7a0b\u4e2d\u8fdb\u884c\u6267\u884c\uff08\u8fd9\u53e5\u8bdd\u7a0d\u5fae\u6709\u70b9\u7ed5\uff09\u3002<\/p>\n\n\n\n
          \u719f\u6089\u6d4f\u89c8\u5668\u7684\u5c0f\u4f19\u4f34\uff0c\u5927\u6982\u7387\u4e5f\u542c\u8fc7\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u7684\u53e6\u4e00\u4e2a\u7ebf\u7a0b\uff1aJs \u5f15\u64ce\u7ebf\u7a0b\u3002<\/p>\n\n\n\n
          \u5f53\u7136\uff0cJs \u5f15\u64ce\u7ebf\u7a0b\u8d1f\u8d23 JavaScript \u4ee3\u7801\u7684\u89e3\u6790\u548c\u6267\u884c\uff0c\u800c\u6e32\u67d3\u7ebf\u7a0b\u5219\u8d1f\u8d23\u5177\u4f53\u9875\u9762\u7684\u89e3\u6790\u548c\u6e32\u67d3\uff08\u6bd4\u5982\u4e0a\u8ff0\u7684 HTML Parse \u8fc7\u7a0b\uff09\u3002<\/p>\n\n\n\n
          \u518d\u7b80\u5355\u6765\u8bf4\uff0c\u300cJs \u5f15\u64ce\u7ebf\u7a0b\u548c\u6e32\u67d3\u7ebf\u7a0b\u8fd9\u4e24\u8005\u662f\u4e92\u65a5\u7684\u300d<\/strong>\u3002<\/p>\n\n\n\n
          \u300c\u5f53 HTML \u4e0b\u8f7d\u65f6\uff0cParse HTML \uff08\u4e0a\u8ff0\u5173\u952e\u6e32\u67d3\u8def\u5f84\u4e2d\u751f\u6210 DomTree\uff09\u7684\u8fc7\u7a0b\u5982\u679c\u78b0\u5230 JS \u811a\u672c\u662f\u4f1a\u505c\u6b62\u540e\u7eed Dom \u7684\u89e3\u6790\u7684\u3002\u300d<\/strong><\/p>\n\n\n\n
          \u90a3\u4e48\uff0c\u6362\u53e5\u8bdd\u6765\u804a\u804a\u3002HTML \u4e2d\u7684 JavaScript \u4f1a\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\u5417\uff1f<\/p>\n\n\n\n
          \u7f51\u7edc\u4e0a\u7edd\u5927\u591a\u6570\u6587\u7ae0\u90fd\u662f\u7247\u9762\u7684\u544a\u8bc9\u4f60\u7ed3\u8bba\uff1aJS \u4f1a\u963b\u585e\u9875\u9762\u6e32\u67d3\uff0c\u4e0d\u8fc7\u7ed3\u679c\u771f\u7684\u662f\u8fd9\u6837\u5417\uff1f<\/p>\n\n\n\n
          \u5176\u5b9e\u4e0a\u8fb9\u8fd9\u4e2a\u95ee\u9898\u6bd4\u8f83\u7b3c\u7edf\uff0c\u662f\u6ca1\u6cd5\u76f4\u63a5\u8fdb\u884c\u56de\u7b54\u7684\uff08\u8d77\u7801\u6211\u5728\u9762\u8bd5\u8fc7\u7a0b\u4e2d\u4ece\u672a\u6709\u5019\u9009\u4eba\u4f1a\u5bf9\u4e8e\u95ee\u9898\u518d\u6b21\u53d1\u51fa\u63d0\u95ee\uff09\u3002<\/p>\n\n\n\n
          \u9996\u5148\uff0c\u5728 HTML \u52a0\u8f7d JavaScript \u5b58\u5728\u4e24\u79cd\u65b9\u5f0f\uff0c\u4e00\u79cd\u4e3a\u5185\u655b\u811a\u672c\u4e5f\u5c31\u662f\u76f4\u63a5\u5c06 JS \u5199\u5728 HTML \u4e2d\uff0c\u53e6\u4e00\u4e2a\u4e2d\u79f0\u4e3a\u5916\u90e8\u8d44\u6e90\uff0c\u4e5f\u5c31\u901a\u8fc7 script \u811a\u672c\u52a0\u8f7d\u7684\u5916\u90e8\u8d44\u6e90\u3002<\/p>\n\n\n\n
          \u53e6\u5916 JavaScript \u4ea7\u751f\u7684\u963b\u585e\uff0c\u6307\u7684\u662f\u52a0\u8f7d\uff08DownLoad\uff09Js \u6587\u4ef6\u65f6\uff0c\u8fd8\u662f\u6267\u884c Js \u6587\u4ef6\u65f6\u8fd9\u53c8\u662f\u53e6\u4e00\u4e2a\u8bdd\u9898\u3002<\/p>\n\n\n\n
          \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5206\u4e3a\u4e0d\u540c\u60c5\u51b5\u6765\u770b\u770b\u4e0d\u540c\u60c5\u51b5\u4e0b\u7684 JS \u5bf9\u4e8e\u662f\u5426\u963b\u585e\u9875\u9762\u6e32\u67d3\u7684\u4e0d\u540c\u8868\u73b0\u3002<\/p>\n\n\n\n
          \u6587\u7ae0\u4e2d\u7684 HTML \u6267\u884c\u5728 Chrome 108.0.5359.71 \u6b63\u5f0f\u7248\u672c\u3002<\/pre>\n\n\n\n
          \u5185\u8054 Js<\/strong><\/p>\n\n\n\n
          \u9996\u5148\uff0c\u6211\u4eec\u6765\u770b\u8fd9\u6837\u4e00\u6bb5\u4ee3\u7801\uff1a<\/p>\n\n\n\n
          <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n  <script>\n    const now = Date.now()\n    while (Date.now() - now < 500) {\n      \/\/ block\n    }\n  <\/script>\n<\/body>\n\n<\/html><\/pre>\n\n\n\n
          \u4e0a\u8ff0\u7684\u4ee3\u7801\u975e\u5e38\u7b80\u5355\uff0c\u6211\u4eec\u5728 HTML \u811a\u672c\u4e2d\u505a\u4e86\u4e00\u4e2a\u5185\u8054\u811a\u672c\u8fdb\u884c\u4e86 500 ms \u7684 block \u3002<\/p>\n\n\n\n
          \u6b63\u5e38\u6765\u8bf4\uff0c\u9996\u5148\u6d4f\u89c8\u5668\u4f1a\u5bf9\u4e8e HTML \u6587\u4ef6\u8fdb\u884c parsing \uff0c\u4e5f\u5c31\u662f\u6240\u8c13 Parse Dom \u751f\u6210 DomTree \u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n
          \u4e0d\u8fc7\u5728\u89e3\u6790\u5230 script<\/code> \u811a\u672c\u4e4b\u540e\uff0c\u5e94\u8be5\u4f1a\u5c06\u4e3b\u7ebf\u7a0b\u4ea4\u7531 JS \u5f15\u64ce\u7ebf\u7a0b\u8fdb\u884c\u6267\u884c JS\uff0c\u4ece\u800c DomTree \u751f\u6210\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n
          \u90a3\u4e48\u4e0d\u96be\u60f3\u8c61\uff0c\u5728\u6784\u5efa DomTree \u7684\u8fc7\u7a0b\u4e2d\u6e32\u67d3\u7ebf\u7a0b\u88ab JS \u62a2\u53bb\u4e86\uff0c\u81ea\u7136\u4e5f\u6ca1\u6cd5\u7ee7\u7eed\u8fdb\u884c\u6e32\u67d3\u4e86\u4e0d\u662f\u3002<\/p>\n\n\n\n
          \u6240\u4ee5\u5bf9\u4e8e\u5185\u8054\u811a\u672c\u7684\u60c5\u51b5\uff0cJS \u4e0d\u5b58\u5728\u52a0\u8f7d\uff08\u672c\u8eab\u5c31\u662f\u5185\u8054\u4e0a\u54ea\u52a0\u8f7d\u53bb\uff09\uff0c\u800c JS \u7684\u89e3\u6790\u548c\u6267\u884c\u662f\u4e00\u5b9a\u4f1a\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\u7684\u3002<\/p>\n\n\n\n
          \u4e0b\u56fe\u662f\u6211\u7528 Performance \u8fd9\u4e2a Demo \u9875\u9762\u7684\u7b80\u5355\u5206\u6790\u622a\u56fe\uff1a<\/p>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u660e\u663e\u53ef\u4ee5\u770b\u5230\uff0cDCL\uff08DomContentLoaded\uff09\u4e4b\u540e\u624d\u4f1a\u51fa\u73b0 FP\uff08First Paint \u9996\u6b21\u7ed8\u5236\u65f6\u95f4\u70b9\uff09\uff0c\u81ea\u7136\u8fd9\u4e5f\u5c31\u660e\u786e\u8868\u793a\u300cDom \u89e3\u6790\u5b8c\u6210\u540e\u8fc7\u4e86\u4e00\u6bb5\u65f6\u95f4\uff08\u8fd9\u6bb5\u65f6\u95f4\u505a\u7684\u4e8b\u60c5\u6211\u4eec\u521a\u521a\u5728\u7b2c\u4e00\u9636\u6bb5\u63d0\u5230\u8fc7\uff09\u9875\u9762\u624d\u4f1a\u8fdb\u884c\u6e32\u67d3\u3002\u300d<\/strong><\/p>\n\n\n\n
          \u5f53\u7136\uff0c\u4e0a\u53e4\u65f6\u671f\u5f88\u591a\u540c\u5b66\u6216\u591a\u6216\u5c11\u4f1a\u542c\u8fc7\u4e00\u53e5\u7ecf\u5178\u7684\u9762\u8bd5\u9898\u201c\u4e3a\u4ec0\u4e48 css \u653e\u4e0a\u8fb9\uff0chtml \u653e\u5728\u5e95\u90e8\u201d\u3002<\/p>\n\n\n\n
          css \u7684\u95ee\u9898\uff0c\u6211\u4eec\u540e\u7eed\u518d\u8bf4\uff0c\u800c\u5bf9\u4e8e js \u653e\u5728\u5e95\u90e8\u5bf9\u4e8e\u5185\u8054\u811a\u672c\u548c\u9875\u9762\u6e32\u67d3\u6765\u8bf4\u5e76\u6ca1\u6709\u4ec0\u4e48\u592a\u5927\u7684\u533a\u522b\u3002<\/p>\n\n\n\n
          \u300c\u4f60\u628a\u5185\u8054\u811a\u672c\u653e\u5728\u54ea\u91cc\u90fd\u662f\u4f1a\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\uff0c\u4e0d\u8fc7\u662f\u653e\u5728\u5e95\u90e8\u5728\u811a\u672c\u4e2d\u53ef\u4ee5\u62ff\u5230\u5185\u5b58\u4e2d\u5df2\u7ecf\u6784\u9020\u597d\u7684 Dom \u8282\u70b9\u8fdb\u884c Dom \u64cd\u4f5c\u800c\u5df2\u3002\u300d<\/strong><\/p>\n\n\n\n
          \u5916\u94fe JS<\/strong><\/p>\n\n\n\n
          \u8ba8\u8bba\u5b8c\u5185\u8054 JS \u7684\u4e8b\u60c5\uff0c\u6211\u4eec\u518d\u6765\u770b\u770b\u5916\u94fe JS \u7684\u95ee\u9898\u3002\u5982\u679c HTML \u4e2d\u7684 JavaScript \u662f\u5916\u90e8\u811a\u672c\uff0c\u90a3\u4e48\u5b83\u7684\u52a0\u8f7d\u548c\u6267\u884c\u662f\u5426\u4f1a\u963b\u585e\u9875\u9762\u6e32\u67d3\u5462\uff1f<\/p>\n\n\n\n
          \u9884\u89e3\u6790<\/p>\n\n\n\n
          \u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u660e\u786e\u7684\u662f HTML \u6587\u6863\u7684\u89e3\u6790\u8fc7\u7a0b\u4e2d\u540c\u65f6\u4f1a\u5b58\u5728\u4e00\u4e2a\u6240\u8c13\u7684\u300c\u9884\u89e3\u6790\u8fc7\u7a0b\u300d<\/strong>\uff0c\u8fd9\u4e00\u8fc7\u7a0b\u4f1a\u5206\u6790 HTML \u4e2d\u7684\u5916\u90e8\u8d44\u6e90\u94fe\u63a5\u4ece\u800c\u5e76\u4e0d\u9700\u8981\u5728\u8fdb\u884c HTML Parse \u7684\u8fc7\u7a0b\u4e2d\u53d1\u73b0\u5916\u90e8\u8d44\u6e90\u624d\u4f1a\u8fdb\u884c\u4e0b\u8f7d\uff0c\u800c\u662f\u5728\u9884\u89e3\u6790\u7684\u8fc7\u7a0b\u4e2d\u63d0\u524d\u8fdb\u884c\u5916\u90e8\u8d44\u6e90\u7684\u4e0b\u8f7d\u3002<\/p>\n\n\n\n
          \u6bd4\u5982\u521a\u624d\u7684 HTML \u4e2d\u6211\u5c06 js \u811a\u672c\u62c6\u5206\u4e3a\u5916\u90e8\u811a\u672cindex.js<\/code>\uff1a<\/p>\n\n\n\n
          <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n  <script src=\".\/index.js\"><\/script>\n<\/body>\n\n<\/html><\/pre>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u6ce8\u610f\u56fe\u4e2d\u7684\u56db\u4e2a\u4f4d\u7f6e\uff0c\u5728 Parse HTML \u7684 Task \u524d\u4e00\u4e2a Task \u5728 Event Log \u4e2d\u6211\u4eec\u5df2\u7ecf\u53ef\u4ee5\u770b\u5230\u53d1\u9001\u4e86\u8bf7\u6c42 index.js \u7684\u8bf7\u6c42\uff0c\u800c\u975e\u662f\u5728 Parse HTML \u9636\u6bb5\u624d\u53d1\u51fa\u7684\u8bf7\u6c42\u54e6\u3002<\/p>\n\n\n\n
          \u90a3\u4e48\uff0c\u5916\u90e8\u8d44\u6e90\u662f\u5426\u4f1a\u963b\u585e\u9875\u9762\u6e32\u67d3\u5462\uff1f\u5176\u5b9e\u7b54\u6848\u5e76\u4e0d\u662f\u90a3\u4e48\u7edd\u5bf9\u3002<\/p>\n\n\n\n
          \u5916\u94fe\u8d44\u6e90\u4f1a\u963b\u585e\u9875\u9762\u6e32\u67d3\u5417\uff1f<\/strong><\/p>\n\n\n\n
          \n\n\n\n
          \u9996\u5148\uff0c\u5916\u90e8 JS \u8d44\u6e90\u7684\u786e\u53ef\u80fd\u4f1a\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\uff0c\u4e0d\u8fc7\u8fd9\u4e5f\u662f\u5206\u60c5\u51b5\u800c\u8bba\u3002<\/p>\n\n\n\n
          \u8fd9\u91cc\u6211\u4eec\u5148\u4e0d\u8003\u8651 async \u548c defer \u7684\u60c5\u51b5\uff0c\u5355\u7eaf\u53ea\u8003\u8651\u5916\u90e8 JS \u811a\u672c\u3002<\/pre>\n\n\n\n
          \u65e0\u8bba\u662f JS \u8d44\u6e90\u7684\u52a0\u8f7d\u548c\u6267\u884c\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u660e\u786e\u7684\u524d\u63d0\uff1a\u300c\u5f53 Parse Html \u7684\u8fc7\u7a0b\u4e2d\u5982\u679c\u78b0\u5230\u5916\u90e8 JS \u811a\u672c\uff0c\u90a3\u4e48\u5916\u94fe\u811a\u672c\u7684\u786e\u662f\u4f1a\u505c\u6b62\u89e3\u6790\u540e\u7eed Dom \u7684\uff0c\u4f46\u662f\u505c\u6b62\u89e3\u6790\u540e\u7eed Dom \u5e76\u4e0d\u610f\u5473\u7740\u4e00\u5b9a\u4f1a\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\u3002\u300d<\/strong><\/p>\n\n\n\n
          \u60c5\u51b51: JS \u811a\u672c\u5728\u9876\u90e8<\/strong><\/p>\n\n\n\n
          \u9996\u5148\uff0c\u6211\u5c06\u4e0a\u8ff0\u7684 HTML \u4e2d\u7684\u5916\u90e8 script \u811a\u672c\u79fb\u52a8 head \u6807\u7b7e\u4e2d\uff1a<\/p>\n\n\n\n
          <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n  <script src=\".\/index.js\"><\/script>\n\n\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n\n<\/body>\n\n<\/html><\/pre>\n\n\n\n
          \u6211\u4eec\u8fd9\u6b21\u6765\u91cd\u65b0\u770b\u770b\u5b83\u7684\u8868\u73b0\u5982\u4f55\uff1a<\/p>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u7ed3\u679c\u4e00\u76ee\u4e86\u7136\uff0c\u9875\u9762\u4e2d\u7684 FP \u548c DCL \u7684\u65f6\u95f4\u76f8\u5dee\u65e0\u51e0\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u5c06\u5916\u90e8\u6807\u7b7e\u5199\u5728 head \u6807\u7b7e\u4e4b\u540e\u7684\u786e\u662f\u4f1a\u963b\u585e\u540e\u7eed DOM \u7684\u6e32\u67d3\u7684\u3002<\/p>\n\n\n\n
          \u60c5\u51b52: JS \u811a\u672c\u5728\u5e95\u90e8<\/strong><\/p>\n\n\n\n
          \u540c\u6837\uff0c\u6211\u4eec\u518d\u6765\u770b\u770b\u5f53\u628a JS \u653e\u5728\u5e95\u90e8\u65f6\u5e94\u8be5\u8868\u73b0\u5982\u4f55\uff1a<\/p>\n\n\n\n
          <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n\n\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n  <script src=\".\/index.js\"><\/script>\n<\/body>\n\n<\/html><\/pre>\n\n\n\n
          \u5176\u5b9e\u7ed3\u679c\u4e00\u76ee\u4e86\u7136\uff0c\u5728\u6267\u884c JS \u4e4b\u524d\u6d4f\u89c8\u5668\u5df2\u7ecf\u8fdb\u884c\u4e86\u9996\u6b21\u7ed8\u5236\u3002<\/p>\n\n\n\n
          \u6362\u53e5\u8bdd\u8bf4\uff0c\u5916\u94fe\u7684 index.js \u7684\u786e\u963b\u6b62\u4e86 Dom Parse \u8fd9\u4e2a\u4e00\u8fc7\u7a0b\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u6e05\u6670\u7684\u770b\u5230 DCL \u662f\u5728 js \u811a\u672c\u6267\u884c\u5b8c\u6bd5\u540e\u89e3\u6790\u5b8c\u6bd5\u751f\u6210 DomTree \u624d\u4f1a\u5b8c\u6210\u3002<\/p>\n\n\n\n
          \u800c index.js \u4e4b\u524d\u7684 Dom \u8282\u70b9\u7684\u6e32\u67d3\u5e76\u6ca1\u6709\u88ab\u963b\u585e\uff0cLCP \u548c FP \u51fa\u73b0\u5728\u4e86\u660e\u663e\u5728 JS \u6267\u884c\u4e4b\u524d\u5f00\u59cb\u3002<\/p>\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n
          \u76f8\u4fe1\u7ecf\u8fc7\u4e24\u6b21\u5bf9\u6bd4\uff0c\u5927\u5bb6\u4e5f\u90fd\u5df2\u7ecf\u6e05\u695a\u6240\u8c13 JS \u8d44\u6e90\u7684\u963b\u585e\u5e76\u4e0d\u662f\u610f\u5473\u7740 JS \u672a\u6267\u884c\u5b8c\u6bd5\u4e4b\u524d\u9875\u9762\u4e00\u76f4\u4f1a\u662f\u767d\u5c4f\u72b6\u6001\uff08\u5f53\u7136\uff0c\u5982\u679c\u4f60\u7684\u5e94\u7528\u65e0\u4efb\u4f55\u9aa8\u67b6\u5c4f\u7684 SPA \u5e94\u7528\u90a3\u4e48\u5176\u5b9eJS\u672a\u6267\u884c\u5b8c\u6bd5\u5c31\u662f\u767d\u5c4f\uff09\u3002<\/p>\n\n\n\n
          *\u5916\u90e8\u811a\u672c\u94fe\u63a5\u7684\u52a0\u8f7d\u548c\u6267\u884c\u53ea\u4f1a\u5f71\u54cd\u540e\u7eed Dom \u7684\u89e3\u6790\u548c\u6e32\u67d3\uff0c\u5bf9\u4e8e\u811a\u672c\u4e4b\u524d\u7684\u7684 Dom \u5e76\u4e0d\u4f1a\u963b\u585e\u5b83\u7684\u89e3\u6790\u4ee5\u53ca\u6e32\u67d3\uff0c\u8fd9\u4e5f\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u5e38\u8bf4\u5c06 js \u653e\u5728\u5e95\u90e8\u3002<\/p>\n\n\n\n
          \u60c5\u51b53: defer & async<\/strong><\/p>\n\n\n\n
            \n
          • defer: \u8fd9\u4e2a\u5e03\u5c14\u5c5e\u6027\u88ab\u8bbe\u5b9a\u7528\u6765\u901a\u77e5\u6d4f\u89c8\u5668\u8be5\u811a\u672c\u5c06\u5728\u300c\u6587\u6863\u5b8c\u6210\u89e3\u6790\u540e\uff0c\u89e6\u53d1\u00a0DOMContentLoaded<\/code>\u00a0\u4e8b\u4ef6\u524d\u6267\u884c\u300d<\/strong>\u3002\u6709\u00a0defer<\/code>\u00a0\u5c5e\u6027\u7684\u811a\u672c\u4f1a\u963b\u6b62\u00a0DOMContentLoaded<\/code>\u00a0\u4e8b\u4ef6\uff0c\u76f4\u5230\u811a\u672c\u88ab\u52a0\u8f7d\u5e76\u4e14\u89e3\u6790\u5b8c\u6210\u3002<\/li>\n<\/ul>\n\n\n\n
            \u4e0a\u8ff0\u662f MDN \u5173\u4e8e defer \u5c5e\u6027\u7684\u63cf\u8ff0\uff0c\u6587\u6863\u89e3\u6790\u5b8c\u6210\u540e\uff0c\u89e6\u53d1 DCL \u4e4b\u524d\u6267\u884c\u3002<\/p>\n\n\n\n
            \u90a3\u4e48\u5176\u5b9e\u7b54\u6848\u5df2\u7ecf\u975e\u5e38\u660e\u663e\u4e86\uff0c\u5982\u679c\u5916\u90e8\u811a\u6b65\u6807\u8bb0\u4e3a defer \u540e\uff0c\u6b64\u65f6\u6587\u6863\u89e3\u6790\u5b8c\u6bd5\u4f1a\u7acb\u5373\u89e6\u53d1\u4e00\u6b21\u6e32\u67d3\u4e4b\u540e\u624d\u4f1a\u53bb\u4f9d\u6b21\u6267\u884c\u6807\u8bb0\u4e3a defer \u7684\u811a\u672c\u3002<\/p>\n\n\n\n
            \u7b80\u5355\u6765\u8bf4\uff0c\u4e5f\u5c31\u662f\u6807\u8bb0\u4e3a defer \u7684\u811a\u672c\u5e76\u4e0d\u4f1a\u963b\u585e\u9875\u9762\u7684\u9996\u6b21\u6e32\u67d3\u3002\u6211\u4eec\u5c1d\u8bd5\u5c06\u4e0a\u8ff0 HTML \u4e2d\u7684\u811a\u672c\u6807\u8bb0\u4e3a defer \u3002<\/p>\n\n\n\n
            <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n  <script defer src=\".\/index.js\"><\/script>\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n<\/body>\n\n<\/html><\/pre>\n\n\n
            \n
            \"\"<\/figure><\/div>\n\n\n
              \n
            • async: \u5bf9\u4e8e\u666e\u901a\u811a\u672c\uff0c\u5982\u679c\u5b58\u5728\u00a0async<\/code>\u00a0\u5c5e\u6027\uff0c\u90a3\u4e48\u666e\u901a\u811a\u672c\u4f1a\u88ab\u5e76\u884c\u8bf7\u6c42\uff0c\u5e76\u5c3d\u5feb\u89e3\u6790\u548c\u6267\u884c\u3002<\/li>\n<\/ul>\n\n\n\n
              \u5f53\u7136\uff0casync \u6807\u8bb0\u7684\u666e\u901a\u811a\u672c\u548c defer \u7684\u539f\u7406\u662f\u76f8\u901a\u7684\u3002<\/p>\n\n\n\n
              \u867d\u7136 async \u7684\u6267\u884c\u65f6\u673a\u5e76\u4e0d\u786e\u5b9a\uff0c\u4f46\u7531\u4e8e async \u4e5f\u540c\u4e3a\u5f02\u6b65\u811a\u672c\u7684\u7279\u6027\uff0c\u6240\u4ee5\u6807\u8bb0\u4e3a async \u5c5e\u6027\u7684\u811a\u672c\u4e5f\u4e0d\u4f1a\u963b\u585e\u540e\u7eed Dom \u6e32\u67d3\uff08\u5f53\u7136\u7531\u4e8e\u5b83\u7684\u6267\u884c\u65f6\u673a\u4e0d\u786e\u5b9a\u6027\uff0c\u811a\u672c\u5728 Receive response & Finish loading \u540e\u7acb\u5373\u6267\u884c\uff0c\u6240\u4ee5 async \u7a76\u7adf\u4f1a\u963b\u585e\u54ea\u4e9b\u8282\u70b9\u6e32\u67d3\u5728\u4e0d\u540c\u7f51\u7edc\u6761\u4ef6\u4e0b\u662f\u4e0d\u5c3d\u76f8\u540c\u7684\uff09\u3002<\/p>\n\n\n\n
              \u90a3\u4e48\uff0cCss \u5462\uff1f<\/strong><\/p>\n\n\n\n
              \n\n\n\n
              \u5728\u63a2\u8ba8\u5b8c JS \u811a\u672c\u5bf9\u4e8e\u9875\u9762\u6e32\u67d3\u7684\u963b\u585e\u540e\uff0c\u6211\u4eec\u518d\u6765\u770b\u770b Css \u6587\u4ef6\u5462\u3002<\/p>\n\n\n\n
              \u65e5\u5e38\u4e1a\u52a1\u9879\u76ee\u4e2d\uff0c\u65e0\u8bba\u662f\u57fa\u4e8e\u5404\u79cd\u6784\u5efa\u5de5\u5177\u8fd8\u662f\u81ea\u5df1\u624b\u64b8\u5404\u79cd\u67b6\u5b50\u3002\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u90fd\u4f1a\u5c06\u751f\u6210\u7684 script \u811a\u672c\u6807\u8bb0\u4e0a defer \u5c5e\u6027\u3002<\/p>\n\n\n\n
              \u81ea\u7136\uff0c\u6807\u8bb0\u4e3a defer \u7684\u811a\u672c\u521a\u521a\u6211\u4eec\u4e5f\u6709\u7ed3\u8bba\u5e76\u4e0d\u4f1a\u963b\u585e\u9875\u9762\u7684\u9996\u5c4f\u6e32\u67d3\uff5e\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u770b\u6240\u8c13\u7684 Css \u53c8\u662f\u5982\u4f55\u8868\u73b0\u7684\u5462\u3002<\/p>\n\n\n\n
              Css \u662f\u5426\u4f1a\u963b\u585e\u9875\u9762\u6e32\u67d3<\/strong><\/p>\n\n\n\n
              \u65e0\u8bba\u662f Css \u8fd8\u662f Js \u6587\u4ef6\uff0c\u90fd\u4f1a\u5b58\u5728\u4e24\u79cd\u6a21\u5f0f\u4e00\u79cd\u662f\u5185\u8054\u4e00\u79cd\u662f\u5916\u90e8\u811a\u672c\u3002<\/p>\n\n\n\n
              \u8fd9\u91cc\u4e4b\u6240\u4ee5\u5e76\u6ca1\u6709\u5c06 Css \u6587\u4ef6\u62c6\u5206\u4e3a\u5185\u8054\u65b9\u5f0f\u3001\u5916\u94fe\u65b9\u5f0f\u6765\u8bb2\u7684\u539f\u56e0\u662f\uff0c\u300c\u65e0\u8bba\u662f\u54ea\u79cd\u65b9\u5f0f\u7684 Css \u90fd\u4f1a\u963b\u585e\u540e\u7eed Dom \u8282\u70b9\u6e32\u67d3\u3002\u300d<\/strong><\/p>\n\n\n\n
              \u4e0a\u8ff0\u5728\u5173\u952e\u6e32\u67d3\u8def\u5f84\u4e2d\uff0c\u6211\u4eec\u63d0\u5230\u8fc7\u9875\u9762\u7684\u6e32\u67d3\u662f\u7531 DomTree \u548c Cssom \u7ed3\u5408\u800c\u6765\u7684 RenderTree \u3002<\/p>\n\n\n\n
              \u5bf9\u4e8e JavaScript \u6587\u4ef6\u7684\u786e\u662f\u4f1a\u963b\u585e\u540e\u7eed Dom Parse \u8fc7\u7a0b\uff0c\u4f46\u662f\u5e76\u4e0d\u4f1a\u963b\u585e\u4e4b\u524d\u8282\u70b9\u7684\u6e32\u67d3\u3002<\/p>\n\n\n\n
              \u800c\u5bf9\u4e8e Css \u6587\u4ef6\uff0c\u5728\u8fdb\u884c HTML Parse \u65f6\u5982\u679c\u78b0\u5230\u4e86\u5916\u90e8 Link \u6807\u7b7e\u662f\u4f1a\u5c06\u5916\u90e8 Link \u4ea4\u7ed9\u7f51\u7edc\u8fdb\u7a0b\u6765\u5f02\u6b65\u4e0b\u8f7d\u3002<\/p>\n\n\n\n
              \u800c\u5bf9\u4e8e Css \u6587\u4ef6\u7684\u89e3\u6790\uff0c\u7531\u4e8e\u300c\u9875\u9762\u4e2d\u7684 Css \u5e76\u672a\u89e3\u6790\u5b8c\u6210\u7684\u8bdd\uff0c\u6b64\u65f6\u662f\u4f1a\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\u7684\u3002\u300d<\/strong>\uff08\u5f53\u7136\uff0c\u5982\u679c\u6837\u5f0f\u811a\u672c\u6ca1\u6709\u4e0b\u8f7d\u5b8c\u6bd5\u5f53\u7136\u4e5f\u4e0d\u4f1a\u88ab\u89e3\u6790\u5b8c\u6bd5\uff09<\/p>\n\n\n\n
              \u6211\u4eec\u4ee5\u4e0b\u9762\u4e00\u6bb5\u7b80\u5355\u7684\u4ee3\u7801\u6765\u505a\u5bf9\u6bd4\uff1a<\/p>\n\n\n\n
              <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n  <link rel=\"stylesheet\" href=\".\/index.css\" \/>\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n<\/body>\n\n<\/html>\n\n<\/pre>\n\n\n\n
              \/\/ index.css\nbody {\n  color: red;\n}<\/pre>\n\n\n\n
              \u4e0a\u8ff0\u7684\u4ee3\u7801\u975e\u5e38\u7b80\u5355\uff0c\u5728 html \u811a\u672c\u4e2d\u6211\u4eec\u52a0\u8f7d\u4e00\u4e2a\u5916\u90e8 stylesheet \u811a\u672c\uff0cindex.css \u4e2d\u4ec5\u4ec5\u662f\u5c06\u6837\u5f0f\u6587\u5b57\u6837\u5f0f\u53d8\u4e3a\u7ea2\u8272\u3002<\/p>\n\n\n\n
              \u6b64\u65f6\uff0c\u6253\u5f00 Performance \u6211\u4eec\u6765\u4e00\u63a2\u7a76\u7adf\uff1a<\/p>\n\n\n
              \n
              \"\"<\/figure><\/div>\n\n\n
              \u4e0a\u8ff0\u4e3a\u9875\u9762\u9996\u6b21\u52a0\u8f7d\u65f6\u7684 performance \u9762\u677f\uff0c\u9996\u5148\u6211\u4eec\u53ef\u4ee5\u5bf9\u6bd4\u7f51\u7edc\u8fdb\u7a0b\u548c\u4e3b\u8fdb\u7a0b\u4e2d\uff0c\u660e\u786e\u7684\u53ef\u4ee5\u770b\u5230\u5f53 css \u6587\u4ef6\u52a0\u8f7d\u5b8c\u6bd5\u4e4b\u540e\u624d\u4f1a\u89e6\u53d1\u9875\u9762\u7684 FP \u65f6\u95f4\u70b9\u3002<\/p>\n\n\n\n
              \u5176\u6b21\uff0c\u56fe\u4e2d\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u65f6\u95f4\u70b9\uff0c\u5206\u522b\u4e3a\u9875\u9762 DCL \u7684\u65f6\u95f4\u7684 FP \u7684\u65f6\u95f4\u3002<\/p>\n\n\n\n
                \n
              • \u9996\u5148\u6211\u4eec\u6765\u770b\u770b\u56fe\u4e2d\u7684\u7b2c\u4e00\u4e2a\u65f6\u95f4\u70b9\uff1aDCL \u7684\u65f6\u95f4\u70b9\u3002\u6211\u4eec\u6e05\u695a\u7684\u53ef\u4ee5\u770b\u5230\u5dee\u4e0d\u591a\u5728 2037ms \u9636\u6bb5\u5df2\u7ecf\u89e3\u6790\u5b8c\u6240\u6709\u7684 Dom \u4e86\uff08\u56e0\u4e3a\u52a0\u8f7d\u5916\u90e8 link \u6807\u7b7e\u5e76\u4e0d\u4f1a\u963b\u585e\u540e\u7eed Dom \u7684\u89e3\u6790\uff0c\u5f53\u7136\u8fd9\u4e5f\u4e0d\u662f\u7edd\u5bf9\u7684\uff09\uff0c\u8bc1\u660e Dom Tree \u5df2\u7ecf\u6784\u5efa\u5b8c\u6bd5\u3002<\/li>\n<\/ul>\n\n\n
                \n
                \"\"<\/figure><\/div>\n\n\n
                \u4f46\u662f\u6b64\u65f6\u9875\u9762\u5e76\u6ca1\u6709\u6e32\u67d3\u4efb\u4f55\u4e1c\u897f\uff0c\u4ecd\u7136\u662f\u9700\u8981\u7b49\u5f85 Css \u6587\u4ef6\u52a0\u8f7d\u5b8c\u6210\uff0c\u76f8\u5f53\u4e8e\u89e6\u53d1 onload \u4e4b\u540e\u624d\u8fdb\u884c\u4e86\u6e32\u67d3\u3002\uff08\u56e0\u4e3a HTML \u4e2d\u4ec5\u6709\u4e00\u4e2a css \u5916\u90e8\u94fe\u63a5\uff0c\u81ea\u7136 css \u6587\u4ef6\u52a0\u8f7d\u5b8c\u6bd5\u5c31\u4f1a\u89e6\u53d1 onload \u4e8b\u4ef6\uff09\u3002<\/p>\n\n\n
                \n
                \"\"<\/figure><\/div>\n\n\n
                \u6211\u4eec\u53ef\u4ee5\u6e05\u6670\u7684\u770b\u5230\u5728 4060.2ms \u5f00\u59cb Receive Data \u6536\u5230 css \u6587\u4ef6\u7684\u6570\u636e\u540c\u65f6\u5f00\u59cb\u4e00\u7cfb\u5217 Parse \u4ee5\u53ca\u540e\u7eed\u7684 Layout \uff08\u5f53\u7136\u4e0b\u4e2a Task \u4e2d\u8fd8\u6709 paint \u7b49\u52a8\u4f5c\uff09\u3002<\/p>\n\n\n\n
                \u6700\u7ec8\u5dee\u4e0d\u591a\u5728 4060ms \u5de6\u53f3\u5f00\u59cb\u89e6\u53d1 FP\uff0c\u6d4f\u89c8\u5668\u7b2c\u4e00\u6b21\u5411\u5c4f\u5e55\u4f20\u8f93\u50cf\u7d20\uff0c\u8868\u793a\u771f\u6b63\u9875\u9762\u624d\u5f00\u59cb\u6e32\u67d3\u3002<\/p>\n\n\n\n
                \u90a3\u4e48\u6211\u4eec\u6765\u6362\u4e00\u79cd\u5199\u6cd5\u5462\uff1f<\/strong><\/p>\n\n\n\n
                \u6b64\u65f6\uff0c\u6211\u4eec\u7a0d\u4f5c\u6539\u52a8\u3002\u5c06\u539f\u672c\u653e\u5728\u9876\u90e8\u7684 css \u6587\u4ef6\u653e\u7f6e\u5728 body \u5e95\u90e8\uff1a<\/p>\n\n\n\n
                <!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n  <meta charset=\"UTF-8\">\n  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n  <title>Document<\/title>\n  <!-- <script async src=\".\/index.js\"><\/script> -->\n<\/head>\n\n<body>\n  <div>Hello<\/div>\n  <p>My Name is 19Qingfeng<\/p>\n  <p>Welcome follow my juejin!<\/p>\n  <link rel=\"stylesheet\" href=\".\/index.css\" \/>\n\n<\/body>\n\n<\/html><\/pre>\n\n\n\n
                \u6b64\u65f6\u6211\u4eec\u518d\u6765\u770b\u770b\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n\n\n
                \n
                \"\"<\/figure><\/div>\n\n\n
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                \u8fd9\u4e2a\u8fc7\u7a0b\u5176\u5b9e\u4e5f\u4e0d\u96be\u7406\u89e3\uff0c\u5f53\u4e3b\u7ebf\u7a0b Parse Html \u7684\u8fc7\u7a0b\u4e2d\u9047\u5230 link \u6807\u7b7e\u4f1a\u7acb\u5373\u8fdb\u884c\u4e00\u6b21\u7ed8\u5236\uff0c\u6b64\u65f6\u5df2\u7ecf\u89e3\u6790\u597d\u7684 DomTree \u4f1a\u88ab\u8ba4\u4e3a Cssom \u4f9d\u8d56\uff08\u672c\u6765\u4e00\u76f4\u5230 link \u6807\u7b7e\u524d\u4e5f\u6ca1\u6709\u4efb\u4f55\u6837\u5f0f\u5185\u5bb9\u9700\u8981\u52a0\u8f7d\uff09\u3002<\/p>\n\n\n\n
                \u6240\u4ee5\uff0c\u9996\u5148\u4f1a\u7ed8\u5236\u4e00\u6b21\u65e0\u6837\u5f0f\u7684 Dom \u5728\u5c4f\u5e55\u4e0a\uff0c\u4e4b\u540e\u7b49\u5f85 link \u6807\u7b7e\u52a0\u8f7d\u5b8c\u6bd5\u5e76\u4e14\u89e3\u6790\u5b8c\u6210 Cssom \u548c\u89e3\u6790\u5230\u7684 DomTree \u4f1a\u751f\u6210 RenderTree \u518d\u6b21\u8fdb\u884c\u9875\u9762\u6e32\u67d3\uff08\u6b64\u65f6\u6e32\u67d3\u7684\u5373\u662f\u5b58\u5728\u6837\u5f0f\u7684\u5185\u5bb9\u4e86\uff09\u3002<\/p>\n\n\n\n
                \u5f53\u7136\uff0c\u8fd9\u6837\u6765\u770b\u7684\u786e\u5c06\u5916\u94fe css \u811a\u672c\u653e\u5728\u5e95\u90e8\u9875\u9762\u7684 FP \u4f1a\u7279\u522b\u5feb\uff0c\u4e0d\u8fc7\u8fd9\u5c31\u7275\u626f\u5230\u53e6\u4e00\u4e2a\u95ee\u9898\u4e86\u3002<\/p>\n\n\n\n
                \u5bf9\u4e8e\u9875\u9762\u6e32\u67d3\u6765\u8bf4\uff0c\u77ed\u6682\u7684\u65e0\u6837\u5f0f\u9875\u9762\u5c55\u793a\u7ed9\u7528\u6237\u662f\u5426\u771f\u6b63\u6709\u5fc5\u8981\uff0c\u4ee5\u53ca\u5bf9\u4e8e\u6d4f\u89c8\u5668\u6765\u8bf4\u9875\u9762\u7684\u91cd\u7ed8\u548c\u56de\u6d41\u6210\u672c\u662f\u5de8\u5927\u7684\u3002<\/p>\n\n\n\n
                Css \u662f\u5426\u4f1a\u963b\u585e Dom \u89e3\u6790<\/strong><\/p>\n\n\n\n
                \n\n\n\n
                \u300c\u8fd9\u91cc\u4e5f\u4e0d\u5bf9\uff0c\u6709\u9700\u8981\u659f\u914c\u7684\u5730\u65b9\u3002\u300d<\/strong><\/p>\n\n\n\n
                \u81f3\u4e8e Css \u662f\u5426\u4f1a\u5f71\u54cd Dom \u89e3\u6790\uff0c\u5f53\u7136 Cssom \u7684\u751f\u6210\u662f\u5728 DomTree \u6784\u5efa\u4e4b\u540e\u53d1\u751f\u3002\u90a3\u4e48\u5916\u90e8 Css \u811a\u672c\u7684\u52a0\u8f7d\u662f\u5426\u4f1a\u5f71\u54cd\u540e\u7eed Dom \u5143\u7d20\u7684\u89e3\u6790\u5462\uff1f<\/p>\n\n\n\n
                \u6362\u53e5\u8bdd\u8bf4\uff0cHtml \u4e2d\u7684 link \u6807\u7b7e\u662f\u5426\u4f1a\u963b\u585e\u540e\u7eed Dom \u89e3\u6790\uff1f\u6211\u76f8\u4fe1\u5927\u591a\u6570\u540c\u5b66\u7684\u56de\u7b54\u90fd\u662f\u4e0d\u4f1a\uff0c\u8fd9\u4e5f\u662f\u6700\u8fd1\u6211\u5728\u51e0\u573a\u9762\u8bd5\u8fc7\u7a0b\u4e2d\u5f97\u5230\u7684\u56de\u7b54\u3002<\/p>\n\n\n\n
                \u5176\u5b9e\uff0c\u7b54\u6848\u5e76\u6ca1\u6709\u90a3\u4e48\u7edd\u5bf9\u3002\u300c\u6216\u8005\u51c6\u786e\u7684\u662f\u8bf4\uff0c\u4f1a\u4e5f\u4e0d\u4f1a\uff1f\u300d<\/strong><\/p>\n\n\n\n
                \u8fd9\u91cc\u6211\u76f4\u63a5\u5148\u653e\u7ed3\u8bba\uff1a<\/p>\n\n\n\n
                  \n
                1. \u666e\u901a\u60c5\u51b5\u4e0bcss<\/code> \u811a\u672c\u7684\u52a0\u8f7d\u5e76\u4e0d\u4f1a\u963b\u585e\u540e\u7eed Dom Tree<\/code> \u7684\u751f\u6210\u3002\uff08Css \u6587\u4ef6\u52a0\u8f7d\u300c\u4e0d\u963b\u585e\u89e3\u6790\u300d<\/strong>\u7279\u6027\uff09<\/li>\n\n\n\n
                2. \u540c\u65f6 css<\/code> \u811a\u672c\u7684\u52a0\u8f7d\u662f\u4f1a\u963b\u585e RenderTree \u7684\u5408\u6210\uff0c\u4ece\u800c\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\uff08Css \u6587\u4ef6\u52a0\u8f7d\u300c\u6e32\u67d3\u963b\u585e\u300d<\/strong>\u7279\u6027\uff09\u3002<\/li>\n\n\n\n
                3. \u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u6bd4\u5982 link \u7684\u6837\u5f0f\u811a\u672c\u540e\u5b58\u5728 JS \u6587\u4ef6\uff0c\u300c\u90a3\u4e48\u6b64\u65f6 Css \u4ee3\u7801\u7684\u52a0\u8f7d\u662f\u4f1a\u963b\u585e\u540e\u7eed JS \u811a\u672c\u7684\u6267\u884c\u4ece\u800c JS \u811a\u672c\u4f1a\u963b\u585e\u540e\u7eed Dom \u7684\u89e3\u6790\uff0c\u4ece\u800c\u53d8\u76f8\u76f8\u5f53\u4e8e\u963b\u585e\u4e86 Js \u4ee3\u7801\u4e4b\u540e\u7684 Dom \u89e3\u6790\u300d<\/strong>\u3002<\/li>\n<\/ol>\n\n\n\n
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                  \u7a0d\u5fae\u603b\u7ed3\u4e00\u4e0b Css<\/strong><\/p>\n\n\n\n
                  \u300c\u6240\u4ee5\uff0c\u5982\u679c\u4f60\u5728\u4e4e\u9875\u9762\u9996\u6b21\u6e32\u67d3\u65f6\u95f4\u3002\u5176\u5b9e\u8fc7\u591a\u7684\u5173\u5fc3 JS \u800c\u5ffd\u7565 Css \u6587\u4ef6\u6070\u6070\u4f1a\u9002\u5f97\u5176\u53cd\u3002\u7edd\u5927\u591a\u6570\u65f6\u5019\u5f71\u54cd\u9875\u9762\u9996\u5c4f\u6e32\u67d3\u7684\u65f6\u673a\u6070\u6070\u662f css \u6587\u4ef6\u5728\u4f5c\u795f\u3002\u300d<\/strong><\/p>\n\n\n\n
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                  \u7ed3\u5c3e<\/strong><\/p>\n\n\n\n
                  \n\n\n\n
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