{"id":9903,"date":"2021-04-10T13:49:06","date_gmt":"2021-04-10T05:49:06","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=9903"},"modified":"2021-04-12T00:31:55","modified_gmt":"2021-04-11T16:31:55","slug":"navigator-connection-downlink","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2021\/04\/navigator-connection-downlink\/","title":{"rendered":"\u4f7f\u7528navigator.connection.downlink\u524d\u7aef\u6d4b\u7f51\u901f"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=9903\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=9903<\/a><br \/>\n\u672c\u6587\u6b22\u8fce\u5206\u4eab\u4e0e\u805a\u5408\uff0c\u5168\u6587\u8f6c\u8f7d\u5c31\u4e0d\u5fc5\u4e86\uff0c\u5c0a\u91cd\u7248\u6743\uff0c\u5708\u5b50\u5c31\u8fd9\u4e48\u5927\uff0c\u82e5\u6025\u7528\u53ef\u4ee5\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/202104-downlink.png';<\/script><\/p>\n<h3>\u4e00\u3001\u7f51\u901f\u4e0e\u4f53\u9a8c\u7b56\u7565<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202104\/downlink-cover.png\" width=\"200\" height=\"130\" alt=\"\u559d\u676f\u5496\u5561 \u5a13\u5a13\u9053\u6765\" class=\"alignright size-medium\" \/><\/p>\n<p>\u4f8b\u5982\u5fae\u535a\u8fd9\u6837\u7684feed\u6d41\u4e00\u6837\u7684\u4ea7\u54c1\uff0c\u5217\u8868\u4e2d\u4e00\u5b9a\u4f1a\u6709\u5927\u91cf\u7684\u56fe\u7247\u3002<\/p>\n<p>\u5728\u79fb\u52a8\u7aef\uff0c\u4e3a\u4e86\u663e\u793a\u8d28\u91cf\uff0c\u5927\u591a\u663e\u793a\u7684\u662f2\u500d\u56fe\uff0c\u751a\u81f3\u662f3\u500d\u56fe\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u5927\u7684\u56fe\u7247\u5fc5\u7136\u4f1a\u6709\u66f4\u5927\u7684\u8d44\u6e90\u5360\u7528\uff0c\u5982\u679c\u7f51\u901f\u4e0d\u7ed9\u529b\uff0c\u5219\u8fd9\u4e9b\u56fe\u7247\u5c31\u4f1a\u52a0\u8f7d\u4e0d\u51fa\u6765\uff0c\u5f71\u54cd\u4ea7\u54c1\u7684\u4f53\u9a8c\u3002<\/p>\n<p>\u8fc7\u53bb\u66fe\u6709\u8fd9\u6837\u4e00\u79cd\u7b56\u7565\uff0c\u5982\u679c\u662fWifi\u73af\u5883\uff0c\u5219\u52a0\u8f7d\u591a\u500d\u56fe\uff0c\u5982\u679c\u662f3G\uff0c4G\u73af\u5883\u5219\u52a0\u8f7d\u666e\u901a1\u500d\u56fe\u3002<\/p>\n<p>\u8fd9\u79cd\u7b56\u7565\u66fe\u4e00\u5ea6\u88ab\u4e0d\u5c11\u4ea7\u54c1\u4f7f\u7528\uff0c\u4f46\u662f\uff0c\u5927\u5bb6\u9700\u8981\u660e\u767d\uff0c\u8fd9\u79cd\u7b56\u7565\u7684\u4e3b\u8981\u76ee\u7684\u4e0d\u5728\u4e8e\u63d0\u9ad8\u56fe\u50cf\u8d44\u6e90\u7684\u52a0\u8f7d\u663e\u793a\u4f53\u9a8c\uff0c\u800c\u662f\u5e2e\u52a9\u7528\u6237\u7701\u94b1\uff0c\u56e0\u4e3a\u4ee5\u524d\u975eWifi\u73af\u5883\u7684\u6d41\u91cf\u8fd8\u662f\u5f88\u8d35\u7684\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u540e\u67654G\u6d41\u91cf\u4e0b\u6765\u4e86\uff0c\u65e0\u9650\u6d41\u91cf\u5957\u9910\u4e5f\u5f88\u591a\uff0c\u4e0a\u9762\u8fd9\u79cd\u7b56\u7565\u5c31\u5c11\u4e86\uff0c\u66f4\u591a\u7684\u662f\u5728Wifi\u73af\u5883\u4e0b\u9884\u52a0\u8f7d\u5e7f\u544a\uff0c\u8fd9\u6837\u5c40\u90e8\u7684\u573a\u666f\u4e0b\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u56de\u5230\u95ee\u9898\u672c\u8eab\uff0c\u57fa\u4e8ewifi\u73af\u5883\u4e0e\u5426\u51b3\u5b9a\u52a0\u8f7d\u7684\u56fe\u7247\u662f\u4e0d\u662f\u9ad8\u6e05\u56fe\u548c\u63d0\u9ad8\u9605\u8bfb\u4f53\u9a8c\u662f\u6ca1\u6709\u4efb\u4f55\u5173\u8054\u6027\u7684\u3002<\/p>\n<p>\u539f\u56e0\u5f88\u7b80\u5355\uff0cwifi\u73af\u5883\u4e5f\u4f1a\u6709\u4fe1\u53f7\u5f31\u7684\u60c5\u51b5\uff0c\u6b64\u65f6\u5e94\u8be5\u52a0\u8f7d\u5c0f\u5c3a\u5bf8\u56fe\u7247\uff0c\u4f18\u5148\u5185\u5bb9\u663e\u793a\uff1b\u800c4G\u4e5f\u6709\u9ad8\u901f\u573a\u666f\uff0c\u4e14\u7528\u6237\u4e0d\u5dee\u94b1\uff0c\u6b64\u65f6\u5e94\u8be5\u663e\u793a\u9ad8\u6e05\u56fe\u624d\u5bf9\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u771f\u6b63\u7cbe\u51c6\u7684\u663e\u793a\u7b56\u7565\u5e94\u8be5\u662f\u4f4e\u7f51\u901f\u60c5\u51b5\u4e0b\u663e\u793a\u666e\u901a\u56fe\uff0c\u9ad8\u7f51\u901f\u60c5\u51b5\u4e0b\u663e\u793a\u9ad8\u6e05\u56fe\u3002<\/p>\n<p>\u6240\u4ee5\u95ee\u9898\u53d8\u6210\uff0c\u5982\u4f55\u77e5\u9053\u7528\u6237\u7684\u7f51\u7edc\u72b6\u51b5\u5462\uff1f<\/p>\n<hr>\n<p>\u9700\u8981\u77e5\u9053\u7528\u6237\u7f51\u7edc\u72b6\u51b5\u7684\u9700\u6c42\u8fd8\u6709\u5f88\u591a\u3002<\/p>\n<p>\u4f8b\u5982\u6700\u8fd1\u5728\u4f7f\u7528ffmpeg.wasm\u505a\u4e00\u4e9b\u4e8b\u60c5\uff0cffmpeg.wasm\u7684\u6838\u5fc3JS\u4ee3\u7801\u670920\u591aM\uff0c\u8fd9\u4e2a\u6587\u4ef6\u7684\u52a0\u8f7d\u5b9e\u5728\u6574\u4e2a\u4e1a\u52a1\u4ee3\u7801\u5185\u90e8\u7684\uff0c\u5e76\u6ca1\u6709\u52a0\u8f7d\u8fdb\u5ea6\u7684\u66b4\u9732\uff0c\u81ea\u5df1\u6ca1\u6cd5\u5236\u4f5c\u7cbe\u51c6\u7684loading\u6548\u679c\uff0c\u4e8e\u662f\u60f3\u5230\u7684\u5c31\u662f\u5224\u65ad\u5f53\u524d\u7f51\u901f\uff0c\u9884\u4f30\u4e0bloading\u52a0\u8f7d\u65f6\u957f\uff0c\u6a21\u62df\u4e0b\u3002<\/p>\n<p>\u53c8\u4f8b\u5982\uff0c\u5982\u679c\u7528\u6237\u7f51\u901f\u4e0d\u662f\u5f88\u7ed9\u529b\uff0c\u5219\u67d0\u4e9b\u9526\u4e0a\u6dfb\u82b1\uff0c\u4f46\u662f\u5bf9\u529f\u80fd\u65e0\u5173\u7d27\u8981\u7684\u8d44\u6e90\u5c31\u53ef\u4ee5\u4e0d\u52a0\u8f7d\u3002\u6bd4\u65b9\u8bf4\u6839\u636e\u9700\u6c42\u65b9\u7684\u8981\u6c42\uff0c\u7ad9\u70b9\u9996\u9875\u65b0\u589e\u4e86\u4e00\u4e2a\u5f88\u9177\u76843D\u52a8\u753b\uff0c\u52a0\u8f7d\u4e86\u5f88\u591a\u8d44\u6e90\u3002\u5982\u679c\u7528\u6237\u7f51\u901f\u4e0d\u4f73\uff0c\u5219\u8fd9\u4e2a\u52a8\u753b\u548c\u8d44\u6e90\u663e\u7136\u5e94\u8be5\u653e\u5f03\u663e\u793a\u3002<\/p>\n<p>\u4ee5\u53ca\uff0c\u5982\u679c\u7528\u6237\u7f51\u901f\u4e0d\u4f73\uff0c\u5219\u5728\u4e0a\u4f20\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u52a0\u4e0a\uff0c\u5f53\u524d\u7f51\u901f\u4e0d\u662f\u5f88\u597d\uff0c\u53ef\u80fd\u9700\u8981\u8f83\u957f\u65f6\u95f4\u7b49\u7b49\u3002<\/p>\n<p>\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u53ef\u4ee5\u5bf9\u7528\u6237\u505a\u5f88\u591a\u8ba9\u4f53\u9a8c\u66f4\u52a0\u53cb\u597d\u7684\u4e8b\u60c5\u3002<\/p>\n<p>\u6240\u4ee5\u8fd8\u662f\u90a3\u4e2a\u95ee\u9898\uff0c\u5982\u4f55\u77e5\u9053\u7528\u6237\u7684\u7f51\u7edc\u72b6\u51b5\u5462\uff1f<\/p>\n<p><span class=\"hidden\">\/\/zxx: \u5982\u679c\u4f60\u770b\u5230\u8fd9\u6bb5\u6587\u5b57\uff0c\u8bf4\u660e\u4f60\u73b0\u5728\u8bbf\u95ee\u662f\u4f53\u9a8c\u7cdf\u7cd5\u7684\u5783\u573e\u76d7\u7248\u7f51\u7ad9\uff0c\u4f60\u53ef\u4ee5\u8bbf\u95ee\u539f\u6587\u83b7\u5f97\u5f88\u597d\u7684\u4f53\u9a8c\uff1ahttps:\/\/www.zhangxinxu.com\/wordpress\/?p=9903\uff08\u4f5c\u8005\u5f20\u946b\u65ed\uff09<\/span><\/p>\n<h3>\u4e8c\u3001connection.downlink<\/h3>\n<p>Chrome\u6d4f\u89c8\u5668\u63d0\u4f9b\u4e86\u539f\u59cb\u7684API <code>navigator.connection.downlink<\/code> \u53ef\u4ee5\u8bbf\u95ee\u7528\u6237\u5f53\u524d\u7f51\u7edc\u73af\u5883\u7684\u7f51\u7edc\u5e26\u5bbd\u3002<\/p>\n<p>\u521d\u770b\u8fd9\u4e2aAPI\u7684\u65f6\u5019\u5f88\u5174\u594b\uff0c\u5988\u5440\uff0c\u662f\u4e0d\u662f\u53ef\u4ee5\u89e3\u51b3\u7531\u6765\u5df2\u4e45\u7684\u4f53\u9a8c\u95ee\u9898\u5566\uff01<\/p>\n<p>\u4f46\u662f\uff0c\u4e86\u89e3\u540e\uff0c\u5927\u5931\u6240\u671b\uff01<\/p>\n<p>connection.downlink\u8fd4\u56de\u7684\u5e76\u4e0d\u662f\u7528\u6237\u5f53\u524d\u73af\u5883\u7684\u5c55\u793a\u7684\u7f51\u7edc\u4f20\u8f93\u901f\u5ea6\uff0c\u800c\u662f\u5f53\u524d\u7f51\u7edc\u7684\u5e26\u5bbd\uff0c\u5b98\u65b9\u8bf4\u6cd5\u662f\uff1a\u8fd4\u56de\u4ee5Mb\/s\u4e3a\u5355\u4f4d\u7684\u6709\u6548\u5e26\u5bbd\uff0c\u5e76\u4fdd\u7559\u8be5\u503c\u4e3a25kb\/s\u7684\u6700\u63a5\u8fd1\u7684\u6574\u6570\u500d\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u6211\u5728\u6211\u5bb6\u91ccChrome\u6d4f\u89c8\u5668\u63a7\u5236\u53f0\u8dd1\u4e00\u4e0bnavigator.connection.downlink\u8fd9\u6bb5\u8bed\u53e5\uff0c\u7ed3\u679c\u8fd4\u56de\u7684\u662f10, \u8868\u793a\u4e0b\u8f7d\u5e26\u5bbd\u662f10M\u7684\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202104\/2021-04-10_115747.png\" width=\"260\" height=\"128\" alt=\"10M\u5e26\u5bbd\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u201c\u5565\uff1f\u6211\u4e00\u5e74\u4ea41800\uff0c\u5e26\u5bbd\u53ea\u670910M\uff0c\u7a0d\u7b49\uff0c\u6211\u6253\u7535\u8bdd\u95ee\u95ee\uff0c\u7b97\u4e86\uff0c\u6587\u7ae0\u5199\u5b8c\u518d\u95ee\u3002\u201d<\/p>\n<p>\u5728\u5b9e\u9645\u751f\u4ea7\u73af\u5883\u4e2d\uff0cconnection.downlink\u51e0\u4e4e\u6ca1\u6709\u4efb\u4f55\u4ef7\u503c\u3002<\/p>\n<p>\u5e26\u5bbd\u518d\u9ad8\uff0c\u8981\u662f\u8fc5\u96f7\u7b49\u4e0b\u8f7d\u8f6f\u4ef6\u5728\u6b7b\u547d\u4e0b\u8f7d\u4e1c\u897f\uff0c\u4f60\u5b9e\u9645\u7684\u4e0a\u7f51\u7f51\u901f\u5176\u5b9e\u5e76\u4e0d\u89c1\u5f97\u9ad8\u3002<\/p>\n<p>\u4ee5\u53ca\uff0c\u5e26\u5bbd\u518d\u9ad8\uff0c\u4f46\u662f\u8bbf\u95ee\u7684\u7f51\u7ad9\u8bbf\u95ee\u91cf\u5927\uff0c\u7f51\u7ad9\u672c\u8eab\u4f20\u8f93\u901f\u5ea6\u6162\uff0c\u6216\u8005\u662f\u56fd\u5916\u7528\u6237\u8bbf\u95ee\u8fd9\u4e2a\u7f51\u7ad9\uff0c\u5b9e\u9645\u4e5f\u662f\u4e2a\u4f4e\u7f51\u901f\u573a\u666f\u3002<\/p>\n<p>\u56e0\u6b64\uff0cconnection.downlink\u6ca1\u6709\u7528\uff0c\u4e0d\u9760\u8c31\u3002<\/p>\n<p>\u518d\u8003\u8651\u5230\u5176\u7cdf\u7cd5\u7684\u517c\u5bb9\u6027\uff0cIE\uff0cSafari\u5747\u4e0d\u652f\u6301\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202104\/2021-04-10_120619.png\" width=\"566\" height=\"219\" alt=\"\u4e0b\u8f7d\u5e26\u5bbd\" class=\"alignnone size-medium\" \/><\/p>\n<p>connection.downlink\u5c31\u662f\u4e2a\u53ea\u53ef\u8fdc\u89c2\u4e0d\u53ef\u4eb5\u73a9\u7684\u73a9\u5177\u800c\u5df2\u3002<\/p>\n<h4>downlinkMax<\/h4>\n<p>\u7a81\u7136\u53d1\u73b0\u8fd8\u6709\u4e2a<code>downlinkMax<\/code>\u5c5e\u6027\uff0c\u6d4b\u8bd5\u4e86\u4e0b\uff0c\u7ed3\u679c\u662fInfinity\uff0c\u6700\u5927\u5e26\u5bbd\u662f\u65e0\u9650\uff0c\u542c\u8d77\u6765\u5f88\u725b\u903c\u554a\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u7406\u8bba\u4e0a\u53ef\u4ee5\u628a\u6574\u4e2a\u94f6\u6cb3\u7cfb\u7684\u6570\u636e\u90fd\u4e0b\u8f7d\u4e0b\u6765\u4e5f\u662f\u6ca1\u95ee\u9898\u7684\u3002<\/p>\n<p>\u7ed3\u8bba<code>downlinkMax<\/code>\u4e5f\u662f\u4e2a\u6ca1\u4ec0\u4e48\u7528\u7684\u4e1c\u897f\u3002<\/p>\n<h4>navigator.connection<\/h4>\n<p>\u673a\u4f1a\u96be\u5f97\uff0c\u987a\u4fbf\u770b\u770bnavigator.connection\u91cc\u9762\u90fd\u6709\u54ea\u4e9b\u597d\u4e1c\u897f\u3002<\/p>\n<pre>console.dir(navigator.connection);<\/pre>\n<p>\u8f93\u51fa\u662f\u4e2aNetworkInformation\u5bf9\u8c61\uff0c\u7ed3\u679c\u660e\u7ec6\u662f\uff1a<\/p>\n<pre>downlink: 10\r\ndownlinkMax: Infinity\r\neffectiveType: \"4g\"\r\nonchange: null\r\nontypechange: null\r\nrtt: 0\r\nsaveData: false\r\ntype: \"ethernet\"<\/pre>\n<p>\u622a\u56fe\u793a\u610f\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202104\/2021-04-10_121145.png\" width=\"311\" height=\"240\" alt=\"\u4ee5\u592a\u7f51\uff0c\u7c7b4G\u6548\u679c\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u7c7b\u578b\u662f\u4ee5\u592a\u7f51\uff0c\u6548\u679c\u7c7b\u4f3c\u4e8e4G\u3002<\/p>\n<p><code>ontypechange<\/code>\u4e8b\u4ef6\u5f15\u8d77\u4e86\u6211\u7684\u5173\u6ce8\uff0c\u7528\u7528\u6237\u4ecewifi\u73af\u5883\u5207\u6362\u52304G\u73af\u5883\uff0c\u8bf4\u4e0d\u5b9a\u524d\u7aef\u4e5f\u80fd\u77e5\u9053\uff0c\u56de\u5934\u6d4b\u8bd5\u4e0b\u3002<\/p>\n<p>\u7136\u540e\uff0c\u6211\u53c8\u5728\u81ea\u5df1\u7684Mac Pro\u4e0b\u6d4b\u8bd5\u4e86\u4e0b<code>navigator.connection<\/code>\u7684\u8f93\u51fa\u7ed3\u679c\uff0c\u7ed3\u679crtt\u503c\u662f100\uff0c\u6ca1\u6709\u4e86ontypechange\u4e8b\u4ef6\uff0c\u4e5f\u6ca1\u6709\u4e86type\u5c5e\u6027\uff0c\u6211\u4e00\u4e0b\u5b50\u9677\u5165\u4e86\u6df1\u601d\uff0c\u5f97\u51fa\u4e00\u4e2a\u7ed3\u8bba\u2014\u2014\u5751\u7239\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202104\/mac-cut-s.png\" width=\"318\" height=\"222\" alt=\"Mac Pro Chrome\u622a\u56fe\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u770b\u6765\u53ea\u80fd\u4f7f\u7528onchange\u4e8b\u4ef6\u5224\u65ad\u7f51\u7edc\u7c7b\u578b\u53d8\u5316\u4e86\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u6240\u6709type\u7c7b\u578b\u793a\u610f\uff1a<\/p>\n<ul>\n<li><code>bluetooth<\/code><\/li>\n<li><code>cellular<\/code><\/li>\n<li><code>ethernet<\/code><\/li>\n<li><code>none<\/code><\/li>\n<li><code>wifi<\/code><\/li>\n<li><code>wimax<\/code><\/li>\n<li><code>other<\/code><\/li>\n<li><code>unknown<\/code><\/li>\n<\/ul>\n<p>\u5c5e\u6027\u503cNetworkInformation.rtt\u8868\u793a\u5ef6\u65f6\uff0c\u8868\u793a\u5f53\u524d\u8fde\u63a5\u4e0b\u5927\u81f4\u7684\u5f80\u8fd4\u65f6\u5ef6\uff08RTT, round-trip time \uff09\uff0c\u5e76\u4fdd\u7559\u8be5\u503c\u4e3a25\u5343\u5206\u79d2\u7684\u6700\u63a5\u8fd1\u7684\u6574\u6570\u500d\u3002<\/p>\n<p>NetworkInformation.saveData\u8868\u793a\u7528\u6237\u662f\u5426\u8bbe\u7f6e\u4e86\u51cf\u5c11\u6570\u636e\u4f7f\u7528\u7684\u9009\u9879\uff0c\u4e5f\u5c31\u662f\u8bbe\u7f6e\u4e86\u8282\u6d41\u3002<\/p>\n<h3>\u4e09\u3001\u8fd8\u662f\u91c7\u7528\u5176\u4ed6\u7b56\u7565<\/h3>\n<p>\u603b\u4e4b\uff0c\u57fa\u4e8eNetworkInformation\u5bf9\u8c61\u5224\u65ad\u7528\u6237\u7684\u7f51\u7edc\u72b6\u51b5\uff0c\u6709\u7528\uff0c\u4f46\u662f\u4e0d\u89c1\u5f97\u591a\u4e48\u7684\u7cbe\u51c6\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u5b9e\u9645\u5f00\u53d1\uff0c\u5f80\u5f80\u91c7\u7528\u5176\u4ed6\u7b56\u7565\u3002<\/p>\n<p>\u76ee\u524d\u573a\u666f\u7684\u7b56\u7565\u662f\u63d0\u4f9b\u591a\u79cd\u9009\u62e9\uff0c\u4f46\u662f\u628a\u9009\u62e9\u6743\u4ea4\u7ed9\u7528\u6237\u3002<\/p>\n<p>\u4e3e\u4e24\u4e2a\u5927\u5bb6\u90fd\u6bd4\u8f83\u719f\u6089\u7684\u6848\u4f8b\uff1a<\/p>\n<h4>1. \u5fae\u4fe1\u4e2d\u56fe\u50cf\u7684\u4f20\u8f93<\/h4>\n<p>\u5fae\u4fe1\u4e2d\uff0c\u65e0\u8bba\u662f\u804a\u5929\u8fd8\u662f\u6587\u4ef6\u4f20\u8f93\uff0c\u7167\u7247\u90fd\u662f\u538b\u7f29\u540e\u7684\u7167\u7247\uff0c\u6240\u4ee5\uff0c\u653e\u5927\u770b\u4f1a\u6bd4\u8f83\u7cca\u3002\u8fd9\u4e2a\u5c31\u662f\u5fae\u4fe1\u7684\u7b56\u7565\uff0c\u9ed8\u8ba4\u663e\u793a\u666e\u901a\u5206\u8fa8\u7387\u7684\u56fe\u7247\uff0c\u4f18\u5148\u8ba9\u7528\u6237\u77e5\u9053\u5185\u5bb9\uff0c\u65e2\u8282\u7ea6\u5e26\u5bbd\u6210\u672c\uff0c\u53c8\u5bf9\u7528\u6237\u8bbf\u95ee\u53cb\u597d\u3002<\/p>\n<p>\u5982\u679c\u7528\u6237\u5e0c\u671b\u67e5\u770b\u9ad8\u6e05\u56fe\uff0c\u5219\u53ef\u4ee5\u70b9\u51fb\u201c\u67e5\u770b\u539f\u56fe\u201d\u6309\u94ae\uff0c\u9009\u62e9\u4ea4\u7ed9\u4e86\u7528\u6237\u3002<\/p>\n<p>\u7b97\u662f\u4e00\u79cd\u4e0d\u9519\u7684\u7b56\u7565\u3002<\/p>\n<h4>2. \u89c6\u9891\u5206\u8fa8\u7387\u7684\u9009\u62e9<\/h4>\n<p>\u5fae\u535a\u7684\u89c6\u9891\u5728\u8fd9\u4e00\u5757\u505a\u7684\u4e0d\u597d\uff0c\u6bcf\u6b21\u90fd\u7ed9\u62111080P\u7684\u89c6\u9891\uff0c\u5b8c\u5168\u8bb0\u4e0d\u4f4f\uff0c\u6bcf\u6b21\u6211\u90fd\u4f1a\u5207\u6362\u5230720P\u89c2\u770b\uff0c\u56e0\u4e3a\u5fae\u535a\u89c6\u98911080P\u7684\u65f6\u5019\uff0c\u753b\u9762\u4f1a\u626d\u66f2\uff0c\u53ef\u80fd\u662f\u81ea\u5df1\u7535\u8111\u4e0d\u884c\u5427\u3002<\/p>\n<p>\u603b\u4e4b\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u89c6\u9891\u7f51\u7ad9\u90fd\u63d0\u4f9b\u4e86\u5206\u8fa8\u7387\u7684\u5207\u6362\u9009\u9879\uff0c\u4e5f\u662f\u628a\u9009\u62e9\u6743\u4ea4\u7ed9\u7528\u6237\u3002<\/p>\n<p>\u5982\u679c\u7528\u6237\u64ad\u653e\u4e0d\u6d41\u7545\uff0c\u5219\u53ef\u4ee5\u9009\u62e9\u4f4e\u5206\u8fa8\u7387\u7684\u89c6\u9891\u8fdb\u884c\u89c2\u770b\u3002<\/p>\n<p>\u4f18\u5148\u5185\u5bb9\uff0c\u800c\u4e0d\u662f\u753b\u8d28\uff0c\u662f\u884c\u4e1a\u90fd\u6bd4\u8f83\u63a5\u53d7\u4e0e\u8ba4\u53ef\u7684\u7b56\u7565\u3002<\/p>\n<hr>\n<h4>\u66f4\u5408\u9002\u7684\u505a\u6cd5\uff1a\u57fa\u4e8e\u73b0\u6709\u573a\u666f\u8fdb\u884c\u4f53\u9a8c\u4f18\u5316<\/h4>\n<p>\u5176\u5b9e\u5f00\u53d1\u8005\u65e0\u9700\u63d0\u524d\u77e5\u9053\u5e26\u5bbd\uff0c\u7136\u540e\u505a\u4ec0\u4e48\u4e8b\u60c5\uff0c\u6ca1\u6709\u5fc5\u8981\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u5728\u5177\u4f53\u573a\u666f\u4e0b\uff0c\u8fdb\u884c\u7f51\u7edc\u72b6\u51b5\u7684\u5224\u65ad\u3002<\/p>\n<p>\u4f8b\u5982\uff0cfeed\u6d41\u4e2d\u6709\u5f88\u591a\u56fe\u7247\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u91c7\u7528XMLHttpRequest\u8fd9\u79cd\u5f62\u5f0f\u53bb\u8bf7\u6c42\u56fe\u50cf\u8d44\u6e90\uff08\u56fe\u7247\u672c\u6765\u5c31\u9700\u8981\u61d2\u52a0\u8f7d\uff0c\u987a\u4fbf\u7684\u4e8b\u60c5\uff09\uff0c\u8fd9\u6837\uff0c\u6709\u4e13\u95e8\u7684progress\u4e8b\u4ef6\uff0c\u53ef\u4ee5\u77e5\u9053\u56fe\u50cf\u7684\u52a0\u8f7d\u8fdb\u5ea6\uff0c\u56fe\u50cf\u7684\u603b\u5927\u5c0f\u3002<\/p>\n<pre>var xhr = new window.XMLHttpRequest();\r\nvar url = 'https:\/\/imgservices-1252317822.image.myqcloud.com\/image\/20191017\/llpf9axb5z.png';\r\nxhr.open('GET', url);\r\nxhr.onprogress = function (event) {\r\n    <span style=\"color:green;\">\/\/ event.loaded\u662f\u5df2\u7ecf\u52a0\u8f7d\u7684\r\n    \/\/ event.total\u662f\u603b\u5927\u5c0f<\/span>\r\n};\r\nxhr.onload = function () {\r\n    <span style=\"color:green;\">\/\/ \u52a0\u8f7d\u6210\u529f<\/span>\r\n};\r\nxhr.onloadend = function () {\r\n    <span style=\"color:green;\">\/\/ \u65e0\u8bba\u6210\u529f\u8fd8\u662f\u5931\u8d25<\/span>\r\n};\r\nxhr.send();<\/pre>\n<p>\u603b\u5927\u5c0f+\u52a0\u8f7d\u5b8c\u6210\u65f6\u95f4\uff0c\u5c31\u53ef\u4ee5\u7b97\u51fa\u8fd9\u5f20\u56fe\u50cf\u52a0\u8f7d\u5b8c\u6bd5\u7684\u65f6\u95f4\u3002<\/p>\n<p>\u5b9e\u9645\u5f00\u53d1\uff0c\u5343\u4e07\u4e0d\u80fd\u5c31\u57fa\u4e8e\u4e00\u5f20\u56fe\u50cf\u7684\u52a0\u8f7d\u60c5\u51b5\u8fdb\u884c\u7f51\u7edc\u73af\u5883\u7684\u5224\u65ad\uff0c\u56e0\u4e3a\u4f1a\u6709\u8f83\u5927\u8bef\u5dee\uff0c\u7f51\u7edc\u4f20\u8f93\u6389\u5305\u662f\u968f\u673a\u7684\uff0c\u56e0\u6b64\uff0c\u9700\u8981\u591a\u4e2a\u7d20\u6750\u4e0b\u7684\u7efc\u5408\u5224\u65ad\u3002<\/p>\n<p>\u5982\u679c\u5927\u91cf\u56fe\u7247\u8bf7\u6c42\u5931\u8d25\uff08\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u8d85\u65f6\u65f6\u95f4\uff09\uff0c\u6216\u8005\u52a0\u8f7d\u65f6\u95f4\u8fc7\u957f\uff0c\u5219\u53ef\u4ee5\u8ba4\u4e3a\u7f51\u7edc\u72b6\u51b5\u4e0d\u4f73\u3002<\/p>\n<p>\u5219\u53ef\u4ee5\u63d0\u793a\u7528\u6237\u201c\u68c0\u6d4b\u5230\u7f51\u7edc\u72b6\u51b5\u4e0d\u4f73\uff0c\u662f\u5426\u663e\u793a\u4f4e\u5206\u8fa8\u7387\u56fe\u50cf\uff1f\u201d<\/p>\n<p>\u7c7b\u4f3c\u8fd9\u79cd\u3002\u6216\u8005\u76f4\u63a5\u66ff\u7528\u6237\u505a\u51b3\u5b9a\uff0c\u52a0\u8f7d\u4f4e\u5206\u8fa8\u7387\u56fe\uff0c\u63d0\u9ad8\u80fd\u591f\u9605\u8bfb\u6210\u529f\u7387\u3002<\/p>\n<p><strong>\u4e0a\u4f20<\/strong><\/p>\n<p>\u8d44\u6e90\u4e0a\u4f20\u4e5f\u53ef\u4ee5\u505a\u7c7b\u4f3c\u7684\u4f53\u9a8c\u4f18\u5316\uff0c\u5982\u679c\u4e0a\u4f20\u901f\u7387\u8f83\u6162\uff0c\u5219\u53ef\u4ee5\u9002\u5f53\u589e\u52a0\u8d85\u65f6\u65f6\u95f4\uff0c\u964d\u4f4e\u5931\u8d25\u7387\uff0c\u540c\u65f6\u63d0\u793a\u7528\u6237\u9884\u4f30\u7684\u65f6\u95f4\u3002<\/p>\n<p>\u82f9\u679cOS 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