{"id":6260,"date":"2017-07-06T23:10:53","date_gmt":"2017-07-06T15:10:53","guid":{"rendered":"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6260"},"modified":"2018-04-24T22:48:42","modified_gmt":"2018-04-24T14:48:42","slug":"js-window-self","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2017\/07\/js-window-self\/","title":{"rendered":"\u4e86\u89e3JS\u4e2d\u7684\u5168\u5c40\u5bf9\u8c61window.self\u548c\u5168\u5c40\u4f5c\u7528\u57dfself"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"http:\/\/www.zhangxinxu.com\/wordpress\/?p=6260\">http:\/\/www.zhangxinxu.com\/wordpress\/?p=6260<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u5f97\u5230\u539f\u4f5c\u8005\u4e66\u9762\u8bb8\u53ef\uff0c\u540c\u65f6\u4fdd\u7559\u539f\u4f5c\u8005\u548c\u51fa\u5904\uff0c\u6458\u8981\u5f15\u6d41\u5219\u968f\u610f\u3002<\/p>\n<h3>\u4e00\u3001\u73b0\u4ee3web\u4e4b\u524d\u7684window.self\u548cself<\/h3>\n<p>\u5bf9\u4e8eweb\u9875\u9762\uff0c\u5728\u9ed8\u8ba4\u72b6\u51b5\u4e0b\uff0c\u4e0b\u97624\u4e2a\u5199\u6cd5\u90fd\u662f\u7b49\u540c\u7684\uff1a<\/p>\n<pre>\nwindow === self                  <span style=\"color:green;\">\/\/ true<\/span>\nwindow.window === window.self    <span style=\"color:green;\">\/\/ true<\/span>\nwindow.self === self             <span style=\"color:green;\">\/\/ true<\/span>\nwindow.window === self           <span style=\"color:green;\">\/\/ true<\/span>\n<\/pre>\n<p>\u8fd9\u79cd\u6709\u610f\u601d\u7684\u73b0\u8c61\u5c31\u4e0d\u7981\u4f1a\u8ba9\u4eba\u7591\u60d1\u4e86\uff0c\u65e2\u7136\u90fd\u662f\u76f8\u7b49\u7684\uff0c\u90a3<code>window.self<\/code>\u548c<code>self<\/code>\u8fd8\u6709\u4ec0\u4e48\u51fa\u73b0\u7684\u610f\u4e49\u5462\uff1f\u76f4\u63a5\u5168\u90e8\u4f7f\u7528<code>window<\/code>\u4e0d\u5c31\u597d\u4e86\uff1f<\/p>\n<p>\u5176\u5b9e\u771f\u5b9e\u60c5\u51b5\u8fd8\u5c31\u662f\u8fd9\u6837\uff0c\u5e76\u6ca1\u6709\u9700\u8981<code>self<\/code>\u51fa\u573a\u7684\u7406\u7531\uff0c\u552f\u4e00\u53ef\u80fd\u6709\u4f5c\u7528\u7684\u5c31\u662f\u66f4\u8bed\u4e49\u5730\u5224\u65ad\u5f53\u524d\u9875\u9762\u662f\u5426\u4f5c\u4e3aiframe\u5d4c\u5165\u4e86\uff0c\u76f4\u63a5\uff1a<\/p>\n<pre>parent === self   <span style=\"color:green;\">\/\/ true\u8868\u793a\u4f5c\u4e3aiframe\u5d4c\u5165\uff0cfalse\u5219\u8868\u793a\u88abiframe\u5d4c\u5165\u4e86<\/span><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<a href=\"http:\/\/www.zhangxinxu.com\/study\/201707\/window-self-iframe.html\" target=\"_blank\">iframe\u5d4c\u5957\u60c5\u51b5\u4e0b\u7684self\u548cparent<\/a><\/p>\n<p>\u7ed3\u679c\uff0c\u4e0a\u9762\u4e00\u884ciframe\u5185\u4fe1\u606f\u5c31\u663e\u793a<code>parent === self<\/code>\u4e3a<code>false<\/code>\uff0c\u4e3b\u9875\u9762\u4e0a\u7684<code>parent === self<\/code>\u4e3a<code>true<\/code>\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/image.zhangxinxu.com\/image\/blog\/201707\/2017-07-06_005836.png\" width=\"405\" height=\"223\" alt=\"iframe\u5185\u7684self\u548cparent\u6bd4\u5bf9\" class=\"alignnone\" 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Workers\uff0c\u672c\u8d28\u4e0a\u90fd\u662f\u5f00\u542f\u4e86\u53e6\u5916\u7684\u7ebf\u7a0b\u3002<\/p>\n<p>\u4f20\u7edf\u7684web\u9875\u9762\u7684JavaScript\u811a\u672c\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u8fd9\u4e2a\u7ebf\u7a0b\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a\u201c\u7a97\u4f53\u7ebf\u7a0b\u201d\uff0c\u5c31\u662f\u8981\u548c\u6d4f\u89c8\u5668\u7a97\u53e3\u6253\u4ea4\u9053\u7684\uff0c\u4e3b\u8981\u4f5c\u7528\u5c31\u662f\u5b9e\u73b0\u6d4f\u89c8\u5668\u7a97\u4f53\u5185\u7684\u5143\u7d20\u4ea4\u4e92\u6548\u679c\uff0c\u56e0\u6b64\u53ea\u8981\u662f\u5168\u5c40\u5bf9\u8c61\uff0c\u90fd\u53ef\u4ee5\u4f7f\u7528<code>window<\/code>\u5bf9\u8c61\u6765\u83b7\u53d6\u3002<\/p>\n<p>\u4f46\u662f\uff0cWorkers\u5f00\u8f9f\u7684\u65b0\u7ebf\u7a0b\u662f\u6ca1\u6709\u201c\u7a97\u4f53\u201d\u8fd9\u4e2a\u6982\u5ff5\u7684\uff0c\u90fd\u662f\u5728\u6d4f\u89c8\u5668\u80cc\u540e\u6084\u6084\u8fd0\u884c\u7684\u7ebf\u7a0b\uff0c\u6ca1\u6709\u7a97\u4f53\u7684\u6982\u5ff5\u4e5f\u5c31\u610f\u5473\u7740\u6ca1\u6709<code>window<\/code>\u5bf9\u8c61\u3002<\/p>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0cService Workers\u548cWeb Workers\u76f8\u5173\u7684\u811a\u672c\u4e2d\u662f\u4e0d\u80fd\u4f7f\u7528<code>window<\/code>\u8fd9\u4e2a\u5bf9\u8c61\u7684\u3002\u90a3\u95ee\u9898\u6765\u4e86\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u5168\u5c40\u4f5c\u7528\u57df\u91cc\u9762\u505a\u4e8b\u60c5\u8be5\u600e\u4e48\u529e\u5462\uff1f<\/p>\n<p>\u597d\uff0c\u6b64\u65f6\uff0c<code>self<\/code>\u7684\u4ef7\u503c\u5c31\u51fa\u73b0\u4e86\uff01<\/p>\n<p>\u5728non-window\u4e0a\u4e0b\u6587\u7684\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>self<\/code>\u6765\u8868\u793a\u5168\u5c40\u4f5c\u7528\u57df\uff0c\u6ce8\u610f\uff0c\u53ea\u80fd\u662f\u5149\u79c3\u79c3\u7684<code>self<\/code>\uff0c<code>window.self<\/code>\u8fd9\u6837\u7684\u5199\u6cd5\u662f\u4e0d\u884c\u7684\u3002<\/p>\n<p>\u4e3e\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5047\u8bbe\u6211\u4eec\u6ce8\u518c\u4e00\u4e2aService Workers\uff0cWorkers\u811a\u672c\u5728<code>sw-test.js<\/code>\u4e2d\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre>navigator.serviceWorker.register('\/sw-test.js');<\/pre>\n<p>\u5219\u6211\u4eec\u5e0c\u671bService Workers\u6ce8\u518c\u5b8c\u6bd5\u5e72\u70b9\u4ec0\u4e48\u4e8b\u60c5\uff0c\u5c31\u53ef\u4ee5\u5728<code>sw-test.js<\/code>\u4e2d\u8fd9\u4e48\u5199\uff1a<\/p>\n<pre><span style=\"color:#cd0000;\">self<\/span>.addEventListener('install', function(event) {\n    <span style=\"color:green;\">\/\/ ...<\/span>\n});<\/pre>\n<h3>\u4e09\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>\u5173\u4e8eService Worker\uff0c\u8fd1\u671f\u4f1a\u8be6\u7ec6\u4ecb\u7ecd\u4e0b\uff0c\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u5148\u5927\u81f4\u4e86\u89e3\u4e0b\uff0cService 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