{"id":4767,"date":"2016-01-25T23:07:03","date_gmt":"2016-01-25T15:07:03","guid":{"rendered":"https:\/\/sdeno.com\/?p=4767"},"modified":"2016-01-25T23:07:03","modified_gmt":"2016-01-25T15:07:03","slug":"html5%e5%bc%82%e6%ad%a5","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=4767","title":{"rendered":"html5\u5f02\u6b65"},"content":{"rendered":"<p>\u4f18\u5316\u811a\u672c\u6587\u4ef6\u7684\u52a0\u8f7d\u63d0\u9ad8\u9875\u9762\u7684\u52a0\u8f7d\u901f\u5ea6\uff0c\u4e00\u76f4\u662f\u524d\u7aef\u5de5\u7a0b\u5e08\u63d0\u9ad8\u9875\u9762\u52a0\u8f7d\u901f\u5ea6\u5f88\u91cd\u8981\u7684\u4e00\u6761\u3002\u56e0\u4e3a\u6d89\u53ca\u5230\u5404\u4e2a\u6d4f\u89c8\u5668\u5bf9\u89e3\u6790\u811a\u672c\u6587\u4ef6\u7684\u4e0d\u540c\u673a\u5236\uff0c\u4ee5\u53ca\u52a0\u8f7d\u811a\u672c\u4f1a\u963b\u585e\u5176\u4ed6\u8d44\u6e90\u548c\u6587\u4ef6\u7684\u52a0\u8f7d\u3002\u5f53\u6d4f\u89c8\u5668\u89e3\u6790\u5668\u9047\u5230&lt;script&gt;\u65f6\uff0c\u4f1a\u7acb\u5373\u52a0\u8f7d\uff08\u52a0\u8f7d\uff1a\u4e0b\u8f7d\uff0c\u89e3\u6790\u548c\u6267\u884c\uff09\uff0c\u6d4f\u89c8\u5668\u5bf9\u5176\u4ed6\u8d44\u6e90\u548c\u6587\u6863\u7684\u52a0\u8f7d\u4f1a\u505c\u6b62\u3002\u4e3a\u4e86\u63d0\u9ad8\u9875\u9762\u7684\u52a0\u8f7d\u901f\u5ea6\uff0c\u5f97\u8ba9JS\u4e0d\u963b\u585e\u5176\u4ed6\u8d44\u6e90\u7684\u52a0\u8f7d\u3002<\/p>\n<p>Webkit \u548c Firefox \u5bf9JS\u7684\u6267\u884c\u8fc7\u7a0b\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u589e\u52a0\u4e86\u201c\u9884\u89e3\u6790\u201d\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u201c\u9884\u89e3\u6790\u201d\u8fc7\u7a0b\u4e0d\u4f1a\u4fee\u6539DOM\u6811\uff0c\u6240\u4ee5\u53ef\u4ee5\u8ddf\u5176\u4ed6\u89e3\u6790\u8fc7\u7a0b\u5e76\u884c,\u8be5\u8fc7\u7a0b\u7531\u9884\u89e3\u6790\u5668\u53bb\u5b8c\u6210\uff0c\u800c\u53ef\u80fd\u4f1a\u6539\u53d8DOM\u6811\u6267\u884c\u8fc7\u7a0b\u5219\u7531\u4e3b\u89e3\u6790\u5668\u6765\u5b8c\u6210\uff0c\u5728<a style=\"color: #0059b3;\" title=\"\u901a\u8fc7\u89e3\u6790\u8fc7\u7a0b\u4e86\u89e3JavaScript\" href=\"http:\/\/www.html5jscss.com\/js-data-scope-52.html#2\">\u901a\u8fc7\u89e3\u6790\u8fc7\u7a0b\u4e86\u89e3JavaScript<\/a>\u6587\u7ae0\u4e2d\u6709\u63d0\u5230\u7684JS\u7684\u201c\u9884\u89e3\u6790\u201d\u8fc7\u7a0b\uff0c\u6b64\u8fc7\u7a0b\u5e94\u8be5\u5c31\u662f\u7531\u6d4f\u89c8\u5668\u7684\u9884\u89e3\u6790\u5668\u5b8c\u6210\uff0c\u9884\u89e3\u6790\u5668\u8fd8\u8d1f\u8d23\u89e3\u6790\u6837\u5f0f\u8868\u548c\u56fe\u7247\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u6d4f\u89c8\u5668\u540c\u4e8b\u8bf7\u6c42http\u7684\u6570\u91cf\u4e5f\u662f\u6709\u4e00\u5b9a\u9650\u5236\u7684\uff0c\u52a0\u8f7djs\u4e0d\u50cf\u52a0\u8f7d\u6837\u5f0f\u90a3\u6837\u662f\u5e76\u884c\u7684\u3002\u6837\u5f0f\u8868\u662f\u6784\u5efa\u5448\u73b0\u6811\u7684\u4e00\u90e8\u5206\uff0c\u6d4f\u89c8\u5668\u5728\u89e3\u6790\u9875\u9762\u7ed3\u6784\u662f\u7531DOM\u6811\u548c\u5448\u73b0\u6811\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u800c\u89e3\u6790\u6267\u884c\u6837\u5f0f\u8868\u53ea\u4f1a\u6539\u53d8\u6837\u5f0f\u8868\u4e0d\u4f1a\u66f4\u6539DOM\u6811\uff0c\u5448\u73b0\u6811\u8ddfDOM\u6811\u867d\u7136\u662f\u76f8\u5bf9\u5e94\u7684\uff0c\u4f46\u5e76\u975e\u4e00\u4e00\u5bf9\u5e94\u3002\u56e0\u6b64\uff0c\u4e5f\u5c31\u6ca1\u6709\u5fc5\u8981\u505c\u6b62\u5bf9\u5176\u4ed6\u8d44\u6e90\u548c\u6587\u6863\u7684\u52a0\u8f7d\u4e86\u3002<\/p>\n<p>\u63d0\u9ad8\u9875\u9762\u52a0\u8f7d\u901f\u5ea6\u7684\u6700\u7b80\u5355\u5feb\u901f\u7684\u65b9\u6cd5\u5c31\u662f\u5c06\u811a\u672c\u6587\u4ef6\u653e\u5230body\u5e95\u90e8\u3002\u4f46\u8fd9\u5e76\u4e0d\u662f\u63d0\u9ad8\u9875\u9762\u52a0\u8f7d\u901f\u5ea6\u6700\u4f18\u65b9\u6848\u7684\u65b9\u6848\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u4ecb\u7ecd\u5176\u4ed6\u65b9\u6848\u3002<\/p>\n<p>\u9996\u5148\u6765\u4ecb\u7ecd\u4e00\u4e0b&lt;script&gt;\u65f6\u80fd\u8ba9\u811a\u672c\u5ef6\u8fdf\u548c\u5f02\u6b65\u6267\u884c\u7684\u4e24\u4e2a\u5c5e\u6027\uff1adefer\u548casync\u3002<\/p>\n<section>\n<h2 id=\"0\" style=\"font-weight: bold; color: #5f5f5f;\">Defer\u3001Async\u5c5e\u6027<\/h2>\n<ul>\n<li><b style=\"color: #1f991f;\">defer<\/b>\u662fhtml4.0\u4e2d\u5b9a\u4e49\u7684\uff0c\u8be5\u5c5e\u6027\u4f7f\u5f97\u6d4f\u89c8\u5668\u80fd\u5ef6\u8fdf\u811a\u672c\u7684\u6267\u884c\uff0c\u7b49\u6587\u6863\u5b8c\u6210\u89e3\u6790\u5b8c\u6210\u540e\u4f1a\u6309\u7167\u4ed6\u4eec\u5728\u6587\u6863\u51fa\u73b0\u987a\u5e8f\u518d\u53bb\u4e0b\u8f7d\u89e3\u6790\u3002\u4e5f\u5c31\u662f\u8bf4defer\u5c5e\u6027\u7684&lt;script&gt;\u5c31\u7c7b\u4f3c\u4e8e\u5c06&lt;script&gt;\u653e\u5728body\u7684\u6548\u679c\u3002<\/li>\n<li><b style=\"color: #1f991f;\">async<\/b>\u662fHTML5\u65b0\u589e\u7684\u5c5e\u6027\uff0cIE10\u548c\u6d4f\u89c8\u5668\u90fd\u662f\u652f\u6301\u8be5\u5c5e\u6027\u7684\u3002\u8be5\u5c5e\u6027\u7684\u4f5c\u7528\u662f\u8ba9\u811a\u672c\u80fd\u5f02\u6b65\u52a0\u8f7d\uff0c\u4e5f\u5c31\u662f\u8bf4\u5f53\u6d4f\u89c8\u5668\u9047\u5230async\u5c5e\u6027\u7684&lt;script&gt;\u65f6\u6d4f\u89c8\u5668\u52a0\u8f7dcss\u4e00\u6837\u662f\u5f02\u6b65\u52a0\u8f7d\u7684\u3002<\/li>\n<\/ul>\n<p>\u652f\u6301async\u5c5e\u6027\u7684\u6d4f\u89c8\u5668\u8c8c\u4f3c\u6ca1\u4ec0\u4e48\u95ee\u9898\uff0c\u4f46\u662fdefer\u5c5e\u6027\u5728\u5404\u4e2a\u6d4f\u89c8\u5668\u4e2d\u652f\u6301\u7a0b\u5ea6\u6709\u70b9\u4e0d\u540c\u3002\u6d4b\u8bd5\u4ee3\u7801\u5982\u4e0b<\/p>\n<figure style=\"color: #565656;\">\n<pre class=\"prettyprint\" style=\"color: #dd1144;\"><span class=\"tag\" style=\"color: #1e347b;\">&lt;script<\/span><span class=\"atn\" style=\"color: #1e347b;\">type<\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"atv\" style=\"color: #dd1144;\">\"text\/javascript\"<\/span><span class=\"atn\" style=\"color: #1e347b;\">defer<\/span><span class=\"tag\" style=\"color: #1e347b;\">&gt;<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    alert<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'defer'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"tag\" style=\"color: #1e347b;\">&lt;\/script&gt;<\/span><span class=\"tag\" style=\"color: #1e347b;\">&lt;script<\/span><span class=\"atn\" style=\"color: #1e347b;\">type<\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"atv\" style=\"color: #dd1144;\">\"text\/javascript\"<\/span><span class=\"tag\" style=\"color: #1e347b;\">&gt;<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    alert<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'script'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"tag\" style=\"color: #1e347b;\">&lt;\/script&gt;<\/span><span class=\"tag\" style=\"color: #1e347b;\">&lt;script<\/span><span class=\"atn\" style=\"color: #1e347b;\">type<\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"atv\" style=\"color: #dd1144;\">\"text\/javascript\"<\/span><span class=\"tag\" style=\"color: #1e347b;\">&gt;<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    window<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">onload <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(){<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n        alert<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'onload'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><span class=\"tag\" style=\"color: #1e347b;\">&lt;\/script&gt;<\/span><\/pre><figcaption>defer\u6d4b\u8bd5\u4ee3\u7801\uff0c\u53ef\u5c06\u4ee3\u7801\u590d\u5236\u5230\u672c\u5730\u81ea\u5df1\u6d4b\u8bd5\uff0c\u5916\u90e8\u811a\u672csrc\u5f15\u5165\uff0c\u5185\u8054\u811a\u672c\u76f4\u63a5\u7c98\u5e16<\/figcaption><\/figure>\n<p>\u8fd0\u884c\u4ee5\u4e0a\u4ee3\u7801\uff0c\u5f97\u51fa\u4ee5\u4e0b\u7ed3\u8bba\uff1a<\/p>\n<ul>\n<li>\u5916\u90e8JS\u5728\u5404\u4e2a\u6d4f\u89c8\u5668\u91cc\u8fd0\u884c\u7ed3\u679c\u8ddf\u5b9a\u4e49\u7684\u6267\u884c\u987a\u5e8f\u6b63\u5e38\uff0calert\u4fe1\u606f\u4f1a\u6309\u7167 script-&gt;defer-&gt;onload\u987a\u5e8f\u5f39\u51fa\uff1b<\/li>\n<li>\u5185\u8054\u811a\u672c\uff0c\u5982\u679c\u811a\u672c\u90fd\u662fIE9\/8\/7\/6\u6309\u7167\u5b9a\u4e49\u7684\u987a\u5e8f\u5f39\u51fa\u4fe1\u606f\uff0c\u5176\u4ed6\u6d4f\u89c8\u5668\u5219\u6309\u7167 defer-&gt;script-&gt;onload \u987a\u5e8f\u5f39\u51fa\u4fe1\u606f\uff0c\u8868\u793adefer\u5931\u6548\u3002<\/li>\n<li>\u800c\u5982\u679c\u6709\u591a\u4e2a\u5185\u8054defer\u811a\u672c\u3001\u5728body\u548chead\u90fd\u6709\u5206\u5e03\u6216\u8005\u5728iframe\u4e2d\u4e5f\u6709\u5185\u8054defer\u811a\u672c\uff0c\u5219\u5728IE6\u4e2d\u8868\u73b0\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u60f3\u7ed9\u811a\u672c\u589e\u52a0defer\u5c5e\u6027\u8ba9\u5176\u5ef6\u8fdf\u52a0\u8f7d\u7684\u8bdd\uff0c\u6700\u597d\u662f\u5916\u90e8\u811a\u672c\uff0c\u5185\u8054\u7684defer\u4e0d\u4ec5\u591a\u6570\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\uff0c\u800c\u4e14IE6\u7684\u8868\u73b0\u4e5f\u4e0d\u4e00\u81f4\u3002<\/p>\n<p>\u6240\u4ee5\u5c06\u811a\u672c\u653e\u5728body\u5e95\u90e8\u6bd4\u7ed9\u811a\u672c\u589e\u52a0defer\u5c5e\u6027\u8ba9\u811a\u672c\u5ef6\u8fdf\u52a0\u8f7d\u66f4\u597d\uff0c\u5c31\u50cfyslow\u5efa\u8bae\u7684\u90a3\u6837\uff1aput style top,put script bottom\u3002<\/p>\n<p>\u6d4f\u89c8\u5668\u7684\u5728\u9047\u5230defer\u548casync\u5c5e\u6027\u7684&lt;script&gt;\u7684\u6d4f\u89c8\u5668\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\uff08\u4ee5\u4e0b\u6458\u81eajavascript\u6743\u5a01\u6307\u5357\uff09\uff1a<\/p>\n<ol>\n<li>WEB\u6d4f\u89c8\u5668\u521b\u5efaDocument\u5bf9\u8c61\uff0c\u5e76\u4e14\u5f00\u59cb\u89e3\u6790WEB\u9875\u9762\uff0c\u89e3\u6790HTML\u5143\u7d20\u548c\u5b83\u4eec\u7684\u6587\u672c\u5185\u5bb9\u540e\u6dfb\u52a0Element\u5bf9\u8c61\u548cText\u8282\u70b9\u5230\u6587\u6863\u4e2d\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u7684readystate\u7684\u5c5e\u6027\u503c\u662f\u201cloading\u201d<\/li>\n<li>\u5f53HTML\u89e3\u6790\u5668\u9047\u5230\u6ca1\u6709async\u548cdefer\u5c5e\u6027\u7684&lt;script&gt;\u65f6\uff0c\u5b83\u628a\u8fd9\u4e9b\u5143\u7d20\u6dfb\u52a0\u5230\u6587\u6863\u4e2d\uff0c\u7136\u540e\u6267\u884c\u884c\u5185\u6216\u5916\u90e8\u811a\u672c\u3002\u8fd9\u4e9b\u811a\u672c\u4f1a\u540c\u6b65\u6267\u884c\uff0c\u5e76\u4e14\u5728\u811a\u672c\u4e0b\u8f7d\uff08\u5982\u679c\u9700\u8981\uff09\u548c\u6267\u884c\u89e3\u6790\u5668\u4f1a\u6682\u505c\u3002\u8fd9\u6837\u811a\u672c\u5c31\u53ef\u4ee5\u7528document.write()\u6765\u628a\u6587\u672c\u63d2\u5165\u5230\u8f93\u5165\u6d41\u4e2d\u3002\u89e3\u6790\u5668\u6062\u590d\u65f6\u8fd9\u4e9b\u6587\u672c\u4f1a\u6210\u4e3a\u6587\u6863\u7684\u4e00\u90e8\u5206\u3002\u540c\u6b65\u811a\u672c\u7ecf\u5e38\u5355\u5b9a\u4e49\u51fd\u6570\u548c\u6ce8\u518c\u540e\u9762\u4f7f\u7528\u7684\u6ce8\u518c\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff0c\u4f46\u5b83\u4eec\u53ef\u4ee5\u904d\u5386\u548c\u64cd\u4f5c\u6587\u6863\u6811\uff0c\u56e0\u4e3a\u5728\u5b83\u4eec\u6267\u884c\u65f6\u5df2\u7ecf\u5b58\u5728\u4e86\u3002\u8fd9\u6837\u540c\u6b65\u811a\u672c\u53ef\u4ee5\u770b\u5230\u4ed6\u81ea\u5df1\u7684&lt;script&gt;\u5143\u7d20\u548c\u5b83\u4eec\u4e4b\u524d\u7684\u6587\u6863\u5185\u5bb9<\/li>\n<li>\u5f53\u89e3\u6790\u5668\u9047\u5230\u4e86\u8bbe\u7f6easync\u5c5e\u6027\u7684&lt;script&gt;\u5143\u7d20\u65f6\uff0c\u5b83\u5f00\u59cb\u4e0b\u8f7d\u811a\u672c\uff0c\u5e76\u7ee7\u7eed\u89e3\u6790\u6587\u6863\u3002\u811a\u672c\u4f1a\u5728\u5b83\u4e0b\u8f7d\u5b8c\u6210\u540e\u5c3d\u5feb\u6267\u884c\uff0c\u4f46\u662f\u89e3\u6790\u5668\u6ca1\u6709\u505c\u4e0b\u6765\u7b49\u4ed6\u4e0b\u8f7d\u3002\u5f02\u6b65\u811a\u672c\u7981\u6b62document.write()\u65b9\u6cd5\u3002\u5b83\u4eec\u53ef\u4ee5\u770b\u5230\u81ea\u5df1\u7684&lt;script&gt;\u5143\u7d20\u548c\u5b83\u4e4b\u524d\u7684\u6240\u6709\u6587\u6863\u5143\u7d20\uff0c\u5e76\u4e14\u53ef\u80fd\u6216\u5e72\u8106\u4e0d\u53ef\u80fd\u8bbf\u95ee\u5176\u4ed6\u7684\u6587\u6863\u5185\u5bb9\u3002<\/li>\n<li>\u5f53\u6587\u6863\u5b8c\u6210\u89e3\u6790\uff0cdocument.readyState\u5c5e\u6027\u53d8\u6210\u201cinteractive\u201d\u3002<\/li>\n<li>\u6240\u6709\u6709defer\u5c5e\u6027\u7684\u811a\u672c\uff0c\u4f1a\u88ab\u5b83\u4eec\u5728\u6587\u6863\u7684\u91cc\u7684\u51fa\u73b0\u987a\u5e8f\u6267\u884c\u3002\u5f02\u6b65\u811a\u672c\u53ef\u80fd\u4e5f\u4f1a\u5728\u8fd9\u4e2a\u65f6\u95f4\u6267\u884c\u3002\u5ef6\u8fdf\u811a\u672c\u80fd\u8bbf\u95ee\u5b8c\u6574\u7684\u6587\u6863\u6811\uff0c\u7981\u6b62\u4f7f\u7528document.write()\u65b9\u6cd5\u3002<\/li>\n<li>\u6d4f\u89c8\u5668\u5728Document\u5bf9\u8c61\u4e0a\u89e6\u53d1DOMContentLoaded\u4e8b\u4ef6\u3002\u8fd9\u6807\u5fd7\u7740\u7a0b\u5e8f\u6267\u884c\u4ece\u540c\u6b65\u811a\u672c\u6267\u884c\u9636\u6bb5\u8f6c\u5230\u5f02\u6b65\u4e8b\u4ef6\u9a71\u52a8\u9636\u6bb5\u3002\u4f46\u8981\u6ce8\u610f\uff0c\u8fd9\u65f6\u53ef\u80fd\u8fd8\u6709\u5f02\u6b65\u811a\u672c\u6ca1\u6709\u6267\u884c\u5b8c\u6210\u3002<\/li>\n<li>\u8fd9\u65f6\uff0c\u6587\u6863\u5df2\u7ecf\u5b8c\u5168\u89e3\u6790\u5b8c\u6210\uff0c\u4f46\u662f\u6d4f\u89c8\u5668\u53ef\u80fd\u8fd8\u5728\u7b49\u5f85\u5176\u4ed6\u5185\u5bb9\u8f7d\u5165\uff0c\u5982\u56fe\u7247\u3002\u5f53\u6240\u6709\u8fd9\u4e9b\u5185\u5bb9\u5b8c\u6210\u8f7d\u5165\u65f6\uff0c\u5e76\u4e14\u6240\u6709\u5f02\u6b65\u811a\u672c\u5b8c\u6210\u8f7d\u5165\u548c\u6267\u884c\uff0cdocument.readyState\u5c5e\u6027\u53d8\u4e3a\u201ccomplete\u201d\uff0cWEB\u6d4f\u89c8\u5668\u51fa\u53d1Window\u5bf9\u8c61\u4e0a\u7684load\u4e8b\u4ef6\u3002<\/li>\n<li>\u4ece\u6b64\u523b\u8d77\uff0c\u4f1a\u8c03\u7528\u5f02\u6b65\u4e8b\u4ef6\uff0c\u4ee5\u5f02\u6b65\u54cd\u5e94\u7528\u6237\u8f93\u5165\u4e8b\u4ef6\uff0c\u7f51\u7edc\u4e8b\u4ef6\uff0c\u8ba1\u7b97\u5668\u8fc7\u671f\u7b49\u3002<\/li>\n<\/ol>\n<\/section>\n<section>\n<h2 id=\"1\" style=\"font-weight: bold; color: #5f5f5f;\">JS\u5f02\u6b65\u52a0\u8f7d<\/h2>\n<p>\u4e86\u89e3\u6d4f\u89c8\u5668\u5728\u9047\u5230async\u3001defer\u5c5e\u6027\u7684\u811a\u672c\u6267\u884c\u987a\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e24\u4e2a\u5c5e\u6027\u6765\u6539\u5584JS\u7684\u963b\u585e\u95ee\u9898\uff0c\u4f7f\u7528\u8fd9\u4e24\u4e2a\u5c5e\u6027\u4f1a\u6709\u51e0\u79cd\u53ef\u80fd\u7684\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li>defer\u4e3atrue\uff1a\u5ef6\u8fdf\u52a0\u8f7d\u811a\u672c\uff0c\u5728\u6587\u6863\u5b8c\u6210\u89e3\u6790\u5b8c\u6210\u5f00\u59cb\u6267\u884c\uff0c\u5e76\u4e14\u5728DOMContentLoaded\u4e8b\u4ef6\u4e4b\u524d\u6267\u884c\u5b8c\u6210\u3002<\/li>\n<li>async\u4e3atrue\uff1a\u5f02\u6b65\u52a0\u8f7d\u811a\u672c\uff0c\u4e0b\u8f7d\u5b8c\u6bd5\u540e\u518d\u6267\u884c\uff0c\u5728window\u7684load\u4e8b\u4ef6\u4e4b\u524d\u6267\u884c\u5b8c\u6210<\/li>\n<\/ul>\n<p>\u5229\u7528\u8fd9\u4e24\u4e2a\u5c5e\u6027\u5f02\u6b65\u52a0\u8f7djs\uff0c\u8fd8\u5f97\u4e86\u89e3\u5b83\u4eec\u7684\u6bdb\u75c5\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528defer\u5c5e\u6027\uff0c\u6700\u597d\u662f\u5916\u90e8\u7684script<\/li>\n<li>\u4f7f\u7528defer\u3001async\u7684\u811a\u672c\u7981\u6b62\u4f7f\u7528document.write()\u65b9\u6cd5<\/li>\n<li>\u5f53\u811a\u672c\u5c1d\u8bd5\u8bbf\u95ee\u7684\u6837\u5f0f\u5c5e\u6027\u53ef\u80fd\u5c1a\u672a\u52a0\u8f7d\u7684\u6837\u5f0f\u8868\u65f6\uff0c\u6d4f\u89c8\u5668\u4f1a\u7981\u6b62\u8be5\u811a\u672c\u7b49\u5f85\u6837\u5f0f\u8868\u52a0\u8f7d\u5b8c\u6210\uff0c\u8fd9\u7b49\u4e8e\u6837\u5f0f\u8868\u963b\u585e\u4e86\u811a\u672c\u7684\u6267\u884c\u3002\u6240\u4ee5\u4f7f\u7528defer\u3001async\u7684\u811a\u672c\u6700\u597d\u4e0d\u8981\u8bf7\u6c42\u6837\u5f0f\u4fe1\u606f\u65f6\u3002<\/li>\n<\/ul>\n<p>\u4e0d\u7ba1\u662f\u4f7f\u7528defer\u8fd8\u662fasync\u5c5e\u6027\uff0c\u90fd\u9700\u8981\u9996\u5148\u5c06\u9875\u9762\u4e2d\u7684js\u6587\u4ef6\u8fdb\u884c\u6574\u7406\uff0c\u5404\u4e2a\u811a\u672c\u6587\u4ef6\u4e4b\u95f4\u7684\u4f9d\u8d56\u6027\uff0c\u54ea\u4e9b\u6587\u4ef6\u53ef\u4ee5\u5ef6\u8fdf\u52a0\u8f7d\u7b49\u7b49\uff0c\u505a\u597djs\u4ee3\u7801\u7684\u5408\u5e76\u548c\u62c6\u5206\uff0c\u7136\u540e\u518d\u6839\u636e\u9875\u9762\u9700\u8981\u5408\u7406\u7684\u4f7f\u7528\u8fd9\u4e24\u4e2a\u5c5e\u6027\u3002defer\u5c5e\u6027\u58f0\u660e\u8fd9\u4e2a\u811a\u672c\u4e2d\u5c06\u4e0d\u4f1a\u6709 document.write \u6216 dom \u4fee\u6539\u3002<\/p>\n<p>\u5f53\u6240\u6709\u811a\u672c\u89e3\u6790\u5b8c\u6210\u540e\uff0cJavaScript\u8fdb\u5165\u7b2c\u4e8c\u4e2a\u9636\u6bb5\uff0c\u8fd9\u4e2a\u9636\u6bb5\u7684\u662f\u5f02\u6b65\u7684\uff0c\u5e76\u4e14\u7531\u4e8b\u4ef6\u9a71\u52a8\u7684\u3002\u5728\u4e8b\u4ef6\u9a71\u52a8\u9636\u6bb5\uff0cWEB\u6d4f\u89c8\u5668\u8c03\u7528\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u51fd\u6570\uff0c\u6765\u54cd\u5e94\u5f02\u6b65\u53d1\u751f\u7684\u4e8b\u4ef6\u3002\u8c03\u7528\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u901a\u5e38\u662f\u7528\u6237\u8f93\u5165\uff0c\u7f51\u7edc\u6d3b\u52a8\uff0c\u8fd0\u884c\u548cJavaScript\u4e2d\u7684\u9519\u8bef\u6765\u89e6\u53d1\u3002<\/p>\n<p>\u901a\u8fc7\u6ce8\u518c\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u51fd\u6570\u6765\u5904\u7406\u7a0b\u5e8f\uff0c\u6ce8\u518c\u7684\u4e8b\u4ef6\u5728\u53d1\u751f\u65f6\u5f02\u6b65\u8c03\u7528\u8fd9\u4e9b\u51fd\u6570\uff0csetTimeout()\u548csetInterval()\u4e5f\u90fd\u662f\u5f02\u6b65\u7684\u3002\u6240\u4ee5\u9875\u9762\u5185\u5bb9\u4e2d\u6709\u5185\u8054script\u653e\u5728setTimeout()\u6267\u884c\u662f\u5f02\u6b65JS\u7684\u4e00\u79cd\u65b9\u6cd5\uff0c\u5f53\u7136\u5c06\u4ee3\u7801\u7a0b\u5e8f\u653e\u5728<a style=\"color: #0059b3;\" title=\"\u8c08\u8bbaDOMReady\u4e8b\u4ef6\u517c\u5bb9\u65b9\u6848\" href=\"http:\/\/www.html5jscss.com\/domready-127.html\">DOMReady<\/a>\u5185\u6267\u884c\u4e5f\u662f\u5f02\u6b65\u52a0\u8f7d\u7684\u65b9\u6cd5\u3002\u4e24\u8005\u90fd\u5c06\u4ee3\u7801\u6267\u884c\u9636\u6bb5\u653e\u5728\u4e86\u4e8b\u4ef6\u9a71\u52a8\u9636\u6bb5\u3002<\/p>\n<p>\u5728dom\u4e2d\u521b\u5efa\u7684script\u6807\u7b7e\u5728\u6d4f\u89c8\u5668\u4e2d\u5219\u662f\u5f02\u6b65\uff0c\u5982\u4e0b\uff1a<\/p>\n<figure style=\"color: #565656;\">\n<pre class=\"prettyprint\" style=\"color: #dd1144;\"><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pln\" style=\"color: #48484c;\"> delay_js<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\">src<\/span><span class=\"pun\" style=\"color: #93a1a1;\">){<\/span><span class=\"kwd\" style=\"color: #1e347b;\">var<\/span><span class=\"pln\" style=\"color: #48484c;\"> objScript <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"pln\" style=\"color: #48484c;\"> document<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">createElement<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'script'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    objScript<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">setAttribute<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'src'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">,<\/span><span class=\"pln\" style=\"color: #48484c;\"> src<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    objScript<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">setAttribute<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'type'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">,<\/span><span class=\"str\" style=\"color: #dd1144;\">'text\/javascript'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    document<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">body<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">appendChild<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\">objScript<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"kwd\" style=\"color: #1e347b;\">return<\/span><span class=\"pln\" style=\"color: #48484c;\"> objScript<\/span><span class=\"pun\" style=\"color: #93a1a1;\">;<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><\/pre><figcaption>\u5f02\u6b65\u52a0\u8f7dJS<\/figcaption><\/figure>\n<p>\u4ee5\u4e0a\u4ee3\u7801\u5f02\u6b65\u52a0\u8f7d\u7684JS\u4e0b\u8f7d\u662f\u8ddf\u5176\u4ed6\u4e00\u6837\u662f\u5e76\u884c\u7684\uff0c\u4f46\u662f\u6267\u884c\u9636\u6bb5\u8fd8\u662f\u4f1a\u963b\u6b62\u9875\u9762\u6e32\u67d3\uff0c\u5ef6\u957f\u4e86window.onload\u7684\u4e8b\u4ef6\u3002\u600e\u4e48\u6837\u624d\u80fd\u4e0b\u8f7d\u548c\u6267\u884cJS\u90fd\u4e0d\u963b\u585e\u9875\u9762\u7684\u6e32\u67d3\u5462\uff0c\u5982\u4e0b\uff1a<\/p>\n<figure style=\"color: #565656;\">\n<pre class=\"prettyprint\" style=\"color: #dd1144;\"><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pln\" style=\"color: #48484c;\"> loadjs<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\">src<\/span><span class=\"pun\" style=\"color: #93a1a1;\">,<\/span><span class=\"pln\" style=\"color: #48484c;\"> succ<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"pun\" style=\"color: #93a1a1;\">{<\/span><span class=\"kwd\" style=\"color: #1e347b;\">var<\/span><span class=\"pln\" style=\"color: #48484c;\"> elem <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"pln\" style=\"color: #48484c;\"> delay_js<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\">src<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"kwd\" style=\"color: #1e347b;\">if<\/span><span class=\"pun\" style=\"color: #93a1a1;\">((<\/span><span class=\"pln\" style=\"color: #48484c;\">navigator<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">userAgent<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">indexOf<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'MSIE'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"pun\" style=\"color: #93a1a1;\">==<\/span><span class=\"pun\" style=\"color: #93a1a1;\">-<\/span><span class=\"lit\" style=\"color: #195f91;\">1<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"pun\" style=\"color: #93a1a1;\">?<\/span><span class=\"kwd\" style=\"color: #1e347b;\">false<\/span><span class=\"pun\" style=\"color: #93a1a1;\">:<\/span><span class=\"kwd\" style=\"color: #1e347b;\">true<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"pun\" style=\"color: #93a1a1;\">{<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n        elem<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">onreadystatechange <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pun\" style=\"color: #93a1a1;\">()<\/span><span class=\"pun\" style=\"color: #93a1a1;\">{<\/span><span class=\"kwd\" style=\"color: #1e347b;\">if<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">\/loaded|complete\/<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">test<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"kwd\" style=\"color: #1e347b;\">this<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">readyState<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)){<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n                succ<\/span><span class=\"pun\" style=\"color: #93a1a1;\">()<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><span class=\"pun\" style=\"color: #93a1a1;\">};<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><span class=\"kwd\" style=\"color: #1e347b;\">else<\/span><span class=\"pun\" style=\"color: #93a1a1;\">{<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n        elem<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">onload <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(){<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n            succ<\/span><span class=\"pun\" style=\"color: #93a1a1;\">();<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n    elem<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">onerror <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pun\" style=\"color: #93a1a1;\">()<\/span><span class=\"pun\" style=\"color: #93a1a1;\">{};<\/span><span class=\"pun\" style=\"color: #93a1a1;\">}<\/span><\/pre><figcaption>JS\u5f02\u6b65\u4e0b\u8f7d+\u6267\u884c\u65b9\u6848<\/figcaption><\/figure>\n<p>\u4ee3\u7801\u5206\u6790\uff1a<\/p>\n<ul>\n<li>\u975eIE\u6d4f\u89c8\u5668\u80fd\u6355\u6349\u5230script\u7684onload\u4e8b\u4ef6\uff0c\u800cIE\u6355\u6349\u4e0d\u5230 script.onload \u4e8b\u4ef6\uff0c\u6240\u4ee5\u53ea\u80fd\u501f\u52a9script.onreadystatechange.<\/li>\n<li>\u68c0\u6d4bonreadystatechange\u72b6\u6001\u4e2d\uff0cIE7\/8\u6700\u540e\u4e00\u4e2a\u72b6\u6001\u5c31\u53ea\u662floaded\uff0c\u800cIE6\u4e2d\u6700\u540e\u4e00\u4e2a\u72b6\u6001\u53ef\u80fd complete \u4e5f\u53ef\u80fd\u662floaded\uff0c\u6240\u4ee5\u7528\u6b63\u5219loaded|complete\u4e24\u4e2a\u72b6\u6001\u90fd\u68c0\u6d4b\u3002<\/li>\n<\/ul>\n<p>\u5f02\u6b65\u52a0\u8f7dJS\u7684\u95ee\u9898\u662f\u65e0\u6cd5\u4f7f\u7528 document.write \u8f93\u51fa\u6587\u6863\u5185\u5bb9\uff0c\u56e0\u4e3a\u6839\u672c\u65e0\u6cd5\u786e\u5b9a document.write \u5e94\u8be5\u8f93\u51fa\u5230\u4ec0\u4e48\u4f4d\u7f6e\uff0c\u4f46\u8fd8\u662f\u53ef\u4ee5\u5728DOMReady\u4e4b\u540e\u6267\u884c\u64cd\u4f5cdom<\/p>\n<section>\n<h3 id=\"2\" style=\"font-weight: 300; color: #ff9933;\">\u5f02\u6b65\u52a0\u8f7d\u7684\u5176\u4ed6\u65b9\u6cd5<\/h3>\n<p>\u9664\u4e86DOMContentLoaded \u4e0e OnLoad \u4e8b\u4ef6\u3001async\u5c5e\u6027\u4ee5\u53cadefer\u5c5e\u6027script\u80fd\u89e3\u51b3JS\u5f02\u6b65\u52a0\u8f7d\u5916\uff0c\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u5f02\u6b65\u52a0\u8f7dJS\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7ajax\u83b7\u53d6js\u5185\u5bb9\uff0c\u7136\u540eeval\u6267\u884c\u3002&nbsp;<br \/>\n<figure style=\"color: #565656;\">\n<pre class=\"prettyprint\" style=\"color: #dd1144;\"><span class=\"kwd\" style=\"color: #1e347b;\">var<\/span><span class=\"pln\" style=\"color: #48484c;\"> xhrObj <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"pln\" style=\"color: #48484c;\"> getXHRObject<\/span><span class=\"pun\" style=\"color: #93a1a1;\">();<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n xhrObj<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">onreadystatechange <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"kwd\" style=\"color: #1e347b;\">function<\/span><span class=\"pun\" style=\"color: #93a1a1;\">()<\/span><span class=\"pun\" style=\"color: #93a1a1;\">{<\/span><span class=\"kwd\" style=\"color: #1e347b;\">if<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\"> xhrObj<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">readyState <\/span><span class=\"pun\" style=\"color: #93a1a1;\">!=<\/span><span class=\"lit\" style=\"color: #195f91;\">4<\/span><span class=\"pun\" style=\"color: #93a1a1;\">)<\/span><span class=\"kwd\" style=\"color: #1e347b;\">return<\/span><span class=\"pun\" style=\"color: #93a1a1;\">;<\/span><span class=\"kwd\" style=\"color: #1e347b;\">eval<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\">xhrObj<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">responseText<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pun\" style=\"color: #93a1a1;\">};<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n xhrObj<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">open<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'GET'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">,<\/span><span class=\"str\" style=\"color: #dd1144;\">'A.js'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">,<\/span><span class=\"kwd\" style=\"color: #1e347b;\">true<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\n xhrObj<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">send<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">''<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><\/pre>\n<\/figure>\n<\/li>\n<li>\u901a\u8fc7\u521b\u5efaiframe\uff1a\u521b\u5efa\u5e76\u63d2\u5165iframe\u5143\u7d20\u3002<br \/>\n<figure style=\"color: #565656;\">\n<pre class=\"prettyprint\" style=\"color: #dd1144;\"><span class=\"kwd\" style=\"color: #1e347b;\">var<\/span><span class=\"pln\" style=\"color: #48484c;\"> iframe <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"pln\" style=\"color: #48484c;\"> document<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">createElement<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'iframe'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\ndocument<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">body<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">appendChild<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"pln\" style=\"color: #48484c;\">iframe<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"kwd\" style=\"color: #1e347b;\">var<\/span><span class=\"pln\" style=\"color: #48484c;\"> doc <\/span><span class=\"pun\" style=\"color: #93a1a1;\">=<\/span><span class=\"pln\" style=\"color: #48484c;\"> iframe<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">contentWindow<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">document<\/span><span class=\"pun\" style=\"color: #93a1a1;\">;<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\ndoc<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">open<\/span><span class=\"pun\" style=\"color: #93a1a1;\">().<\/span><span class=\"pln\" style=\"color: #48484c;\">write<\/span><span class=\"pun\" style=\"color: #93a1a1;\">(<\/span><span class=\"str\" style=\"color: #dd1144;\">'&lt;body onload=\"insertJS()\"&gt;'<\/span><span class=\"pun\" style=\"color: #93a1a1;\">);<\/span><span class=\"pln\" style=\"color: #48484c;\">\r\ndoc<\/span><span class=\"pun\" style=\"color: #93a1a1;\">.<\/span><span class=\"pln\" style=\"color: #48484c;\">close<\/span><span class=\"pun\" style=\"color: #93a1a1;\">();<\/span><\/pre>\n<\/figure>\n<p>\u6b64\u65b9\u6cd5\u5b58\u5728\u8de8\u57df\u95ee\u9898\uff0c\u5982\u679c\u7236\u9875\u9762\u57df\u540d\u4fee\u6539\uff0c\u5219\u901a\u8fc7javascript\u534f\u8bae\u6267\u884c\u540c\u6837\u57df\u540d\u5347\u7ea7\u8bed\u53e5\u3002<\/li>\n<li>\u9875\u5185 js \u7684\u5185\u5bb9\u88ab\u6ce8\u91ca\u4e0d\u4f1a\u6267\u884c\uff0c\u4f46\u662f\u5728\u9700\u8981\u7684\u65f6\u5019\u53bb\u6389\u6ce8\u91ca\uff0ceval\u6267\u884cjs\uff0c<\/li>\n<li>\u5728\u9875\u9762\u4e2ddocument.write Script Tag<\/li>\n<li>\u7528 setTimeout \u5ef6\u8fdf0\u79d2 \u4e0e \u5176\u5b83\u65b9\u6cd5\u7ec4\u5408<\/li>\n<\/ul>\n<\/section>\n<p>\u8fd8\u6709\u4e4b\u524d\u8bf4\u7684\u4e8b\u4ef6\u9a71\u52a8\u9636\u6bb5\u6267\u884c\u4ee5\u53ca\u589e\u52a0defer\u6216\u8005async\u5c5e\u6027\u90fd\u662f\u5f02\u6b65\u52a0\u8f7dJS\u7684\u65b9\u6cd5\uff0c\u7528\u54ea\u4e00\u79cd\u65b9\u6cd5\u5c31\u5f97\u6211\u4eec\u6309\u7167\u9700\u6c42\u5404\u81ea\u53d6\u820d\u4e86\u3002\u4f46\u662f\u4e0d\u7ba1\u91c7\u7528\u4f55\u79cd\u65b9\u6cd5\u90fd\u4e0d\u80fd\u4fdd\u8bc1\u6267\u884c\u987a\u5e8f\uff0c\u90fd\u9700\u8981\u5c06\u6240\u6709js\u5185\u5bb9\u6309\u6a21\u5757\u5316\u7684\u65b9\u5f0f\u6765\u5207\u5206\uff0c\u54ea\u4e9b\u6a21\u5757\u5b58\u5728\u4f9d\u8d56\u5173\u7cfb\uff0c\u54ea\u4e9b\u6a21\u5757\u53ef\u4ee5\u5f02\u6b65\uff0cJS\u600e\u4e48\u5207\u5206\u5f97\u659f\u914c\u659f\u914c\u518d\u659f\u914c\uff01\u800c\u547d\u540d\u7a7a\u95f4\u5c06\u5982\u4f55\u7ba1\u7406\uff0c\u672c\u6587\u5219\u4e0d\u7ee7\u7eed\u7814\u7a76\u4e86\uff0c\u7b49\u7814\u7a76\u5b8c<br \/>\n<a style=\"color: #0059b3;\" href=\"http:\/\/requirejs.org\/\" target=\"_blank\" rel=\"external nofollow\">requirejs<\/a>\u3001\u00a0<a style=\"color: #0059b3;\" href=\"http:\/\/www.commonjs.org\/\" target=\"_blank\" rel=\"external nofollow\">commonjs<\/a>\u4ee5\u53ca\u00a0<a style=\"color: #0059b3;\" href=\"http:\/\/seajs.org\/\" target=\"_blank\">seajs<\/a>\u518d\u5199\u4e00\u7247\u6587\u7ae0<\/p>\n<p><a href=\"http:\/\/www.html5jscss.com\/js_async.html\" target=\"_blank\">http:\/\/www.html5jscss.com\/js_async.html<\/a><\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>\u4f18\u5316\u811a\u672c\u6587\u4ef6\u7684\u52a0\u8f7d\u63d0\u9ad8\u9875\u9762\u7684\u52a0\u8f7d\u901f\u5ea6\uff0c\u4e00\u76f4\u662f\u524d\u7aef\u5de5\u7a0b\u5e08\u63d0\u9ad8\u9875\u9762\u52a0\u8f7d\u901f\u5ea6\u5f88\u91cd\u8981\u7684\u4e00\u6761\u3002\u56e0\u4e3a\u6d89\u53ca\u5230\u5404\u4e2a\u6d4f\u89c8\u5668\u5bf9\u89e3\u6790 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