{"id":191407,"date":"2020-05-29T10:00:30","date_gmt":"2020-05-29T02:00:30","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=191407"},"modified":"2020-05-18T09:00:40","modified_gmt":"2020-05-18T01:00:40","slug":"front-end-browser-works","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/front-end-browser-works.html","title":{"rendered":"\u524d\u7aef\u6d4f\u89c8\u5668\u5de5\u4f5c\u539f\u7406"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 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20px;\"><strong>\u6d4f\u89c8\u5668\u7684\u591a\u8fdb\u7a0b\u67b6\u6784<\/strong><\/div>\n<p>\u5047\u5982\u6211\u4eec\u53bb\u5f00\u53d1\u4e00\u4e2a\u6d4f\u89c8\u5668\uff0c\u5b83\u7684\u67b6\u6784\u53ef\u4ee5\u662f\u4e00\u4e2a\u5355\u8fdb\u7a0b\u591a\u7ebf\u7a0b\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u4f7f\u7528IPC\u901a\u4fe1\u7684\u591a\u8fdb\u7a0b\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>\u4e0d\u540c\u7684\u6d4f\u89c8\u5668\u4f7f\u7528\u4e0d\u540c\u7684\u67b6\u6784\uff0c\u4e0b\u9762\u4e3b\u8981\u4ee5Chrome\u4e3a\u4f8b\uff0c\u4ecb\u7ecd\u6d4f\u89c8\u5668\u7684\u591a\u8fdb\u7a0b\u67b6\u6784\u3002<\/p>\n<p>\u5728Chrome\u4e2d\uff0c\u4e3b\u8981\u7684\u8fdb\u7a0b\u67094\u4e2a\uff1a<\/p>\n<li>\u6d4f\u89c8\u5668\u8fdb\u7a0b (Browser 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Process)\uff1a\u8d1f\u8d23\u5904\u7406\u6574\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7684GPU\u4efb\u52a1<\/li>\n<p>\u8fd94\u4e2a\u8fdb\u7a0b\u4e4b\u95f4\u7684\u5173\u7cfb\u662f\u4ec0\u4e48\u5462\uff1f<\/p>\n<p>\u9996\u5148\uff0c\u5f53\u6211\u4eec\u662f\u8981\u6d4f\u89c8\u4e00\u4e2a\u7f51\u9875\uff0c\u6211\u4eec\u4f1a\u5728\u6d4f\u89c8\u5668\u7684\u5730\u5740\u680f\u91cc\u8f93\u5165URL\uff0c\u8fd9\u4e2a\u65f6\u5019Browser Process\u4f1a\u5411\u8fd9\u4e2aURL\u53d1\u9001\u8bf7\u6c42\uff0c\u83b7\u53d6\u8fd9\u4e2aURL\u7684HTML\u5185\u5bb9\uff0c\u7136\u540e\u5c06HTML\u4ea4\u7ed9Renderer Process\uff0cRenderer Process\u89e3\u6790HTML\u5185\u5bb9\uff0c\u89e3\u6790\u9047\u5230\u9700\u8981\u8bf7\u6c42\u7f51\u7edc\u7684\u8d44\u6e90\u53c8\u8fd4\u56de\u6765\u4ea4\u7ed9Browser Process\u8fdb\u884c\u52a0\u8f7d\uff0c\u540c\u65f6\u901a\u77e5Browser Process\uff0c\u9700\u8981Plugin Process\u52a0\u8f7d\u63d2\u4ef6\u8d44\u6e90\uff0c\u6267\u884c\u63d2\u4ef6\u4ee3\u7801\u3002\u89e3\u6790\u5b8c\u6210\u540e\uff0cRenderer 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20px;\"><strong>\u591a\u8fdb\u7a0b\u67b6\u6784\u7684\u597d\u5904<\/strong><\/div>\n<p>Chrome\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u591a\u8fdb\u7a0b\u67b6\u6784\u5462\uff1f<\/p>\n<p>\u7b2c\u4e00\uff0c\u66f4\u9ad8\u7684\u5bb9\u9519\u6027\u3002\u5f53\u4ecaWEB\u5e94\u7528\u4e2d\uff0cHTML\uff0cJavaScript\u548cCSS\u65e5\u76ca\u590d\u6742\uff0c\u8fd9\u4e9b\u8dd1\u5728\u6e32\u67d3\u5f15\u64ce\u7684\u4ee3\u7801\uff0c\u9891\u7e41\u7684\u51fa\u73b0BUG\uff0c\u800c\u6709\u4e9bBUG\u4f1a\u76f4\u63a5\u5bfc\u81f4\u6e32\u67d3\u5f15\u64ce\u5d29\u6e83\uff0c\u591a\u8fdb\u7a0b\u67b6\u6784\u4f7f\u5f97\u6bcf\u4e00\u4e2a\u6e32\u67d3\u5f15\u64ce\u8fd0\u884c\u5728\u5404\u81ea\u7684\u8fdb\u7a0b\u4e2d\uff0c\u76f8\u4e92\u4e4b\u95f4\u4e0d\u53d7\u5f71\u54cd\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u5176\u4e2d\u4e00\u4e2a\u9875\u9762\u5d29\u6e83\u6302\u6389\u4e4b\u540e\uff0c\u5176\u4ed6\u9875\u9762\u8fd8\u53ef\u4ee5\u6b63\u5e38\u7684\u8fd0\u884c\u4e0d\u6536\u5f71\u54cd\u3002<\/p>\n<p>\u7b2c\u4e8c\uff0c\u66f4\u9ad8\u7684\u5b89\u5168\u6027\u548c\u6c99\u76d2\u6027\uff08sanboxing\uff09\u3002\u6e32\u67d3\u5f15\u64ce\u4f1a\u7ecf\u5e38\u6027\u7684\u5728\u7f51\u7edc\u4e0a\u9047\u5230\u4e0d\u53ef\u4fe1\u3001\u751a\u81f3\u662f\u6076\u610f\u7684\u4ee3\u7801\uff0c\u5b83\u4eec\u4f1a\u5229\u7528\u8fd9\u4e9b\u6f0f\u6d1e\u5728\u4f60\u7684\u7535\u8111\u4e0a\u5b89\u88c5\u6076\u610f\u7684\u8f6f\u4ef6\uff0c\u9488\u5bf9\u8fd9\u4e00\u95ee\u9898\uff0c\u6d4f\u89c8\u5668\u5bf9\u4e0d\u540c\u8fdb\u7a0b\u9650\u5236\u4e86\u4e0d\u540c\u7684\u6743\u9650\uff0c\u5e76\u4e3a\u5176\u63d0\u4f9b\u6c99\u76d2\u8fd0\u884c\u73af\u5883\uff0c\u4f7f\u5176\u66f4\u5b89\u5168\u66f4\u53ef\u9760<\/p>\n<p>\u7b2c\u4e09\uff0c\u66f4\u9ad8\u7684\u54cd\u5e94\u901f\u5ea6\u3002\u5728\u5355\u8fdb\u7a0b\u7684\u67b6\u6784\u4e2d\uff0c\u5404\u4e2a\u4efb\u52a1\u76f8\u4e92\u7ade\u4e89\u62a2\u593aCPU\u8d44\u6e90\uff0c\u4f7f\u5f97\u6d4f\u89c8\u5668\u54cd\u5e94\u901f\u5ea6\u53d8\u6162\uff0c\u800c\u591a\u8fdb\u7a0b\u67b6\u6784\u6b63\u597d\u89c4\u907f\u4e86\u8fd9\u4e00\u7f3a\u70b9\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u591a\u8fdb\u7a0b\u67b6\u6784\u4f18\u5316<\/strong><\/div>\n<p>\u4e4b\u524d\u7684\u6211\u4eec\u8bf4\u5230\uff0cRenderer Process\u7684\u4f5c\u7528\u662f\u8d1f\u8d23\u4e00\u4e2aTab\u5185\u7684\u663e\u793a\u76f8\u5173\u7684\u5de5\u4f5c\uff0c\u8fd9\u5c31\u610f\u5473\u7740\uff0c\u4e00\u4e2aTab\uff0c\u5c31\u4f1a\u6709\u4e00\u4e2aRenderer Process\uff0c\u8fd9\u4e9b\u8fdb\u7a0b\u4e4b\u95f4\u7684\u5185\u5b58\u65e0\u6cd5\u8fdb\u884c\u5171\u4eab\uff0c\u800c\u4e0d\u540c\u8fdb\u7a0b\u7684\u5185\u5b58\u5e38\u5e38\u9700\u8981\u5305\u542b\u76f8\u540c\u7684\u5185\u5bb9\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u6d4f\u89c8\u5668\u7684\u8fdb\u7a0b\u6a21\u5f0f<\/strong><\/div>\n<p>\u4e3a\u4e86\u8282\u7701\u5185\u5b58\uff0cChrome\u63d0\u4f9b\u4e86\u56db\u79cd\u8fdb\u7a0b\u6a21\u5f0f\uff08Process Models\uff09\uff0c\u4e0d\u540c\u7684\u8fdb\u7a0b\u6a21\u5f0f\u4f1a\u5bf9 tab \u8fdb\u7a0b\u505a\u4e0d\u540c\u7684\u5904\u7406\u3002<\/p>\n<li>Process-per-site-instance (default) - \u540c\u4e00\u4e2a site-instance \u4f7f\u7528\u4e00\u4e2a\u8fdb\u7a0b<\/li>\n<li> Process-per-site - \u540c\u4e00\u4e2a site \u4f7f\u7528\u4e00\u4e2a\u8fdb\u7a0b<\/li>\n<li> Process-per-tab - \u6bcf\u4e2a tab \u4f7f\u7528\u4e00\u4e2a\u8fdb\u7a0b<\/li>\n<li> Single process - \u6240\u6709 tab \u5171\u7528\u4e00\u4e2a\u8fdb\u7a0b<\/li>\n<p>\u8fd9\u91cc\u9700\u8981\u7ed9\u51fa site \u548c site-instance \u7684\u5b9a\u4e49<\/p>\n<li>site \u6307\u7684\u662f\u76f8\u540c\u7684 registered domain name(\u5982\uff1a google.com \uff0cbbc.co.uk)\u548cscheme (\u5982\uff1ahttps:\/\/)\u3002\u6bd4\u5982a.baidu.com\u548cb.baidu.com\u5c31\u53ef\u4ee5\u7406\u89e3\u4e3a\u540c\u4e00\u4e2a site\uff08\u6ce8\u610f\u8fd9\u91cc\u8981\u548c Same-origin policy \u533a\u5206\u5f00\u6765\uff0c\u540c\u6e90\u7b56\u7565\u8fd8\u6d89\u53ca\u5230\u5b50\u57df\u540d\u548c\u7aef\u53e3\uff09\u3002<\/li>\n<li>site-instance \u6307\u7684\u662f\u4e00\u7ec4 connected pages from the same site\uff0c\u8fd9\u91cc connected \u7684\u5b9a\u4e49\u662f can obtain references to each other in script code \u600e\u4e48\u7406\u89e3\u8fd9\u6bb5\u8bdd\u5462\u3002\u6ee1\u8db3\u4e0b\u9762\u4e24\u4e2d\u60c5\u51b5\u5e76\u4e14\u6253\u5f00\u7684\u65b0\u9875\u9762\u548c\u65e7\u9875\u9762\u5c5e\u4e8e\u4e0a\u9762\u5b9a\u4e49\u7684\u540c\u4e00\u4e2a site\uff0c\u5c31\u5c5e\u4e8e\u540c\u4e00\u4e2a site-instance<\/li>\n<li>\u7528\u6237\u901a\u8fc7<a target=\"_blank\" rel=\"noopener noreferrer\">\u8fd9\u79cd\u65b9\u5f0f\u70b9\u51fb\u6253\u5f00\u7684\u65b0\u9875\u9762<\/a><\/li>\n<li>JS\u4ee3\u7801\u6253\u5f00\u7684\u65b0\u9875\u9762\uff08\u6bd4\u5982 window.open)<\/li>\n<p>\u7406\u89e3\u4e86\u6982\u5ff5\u4e4b\u540e\uff0c\u4e0b\u9762\u89e3\u91ca\u56db\u4e2a\u8fdb\u7a0b\u6a21\u5f0f<\/p>\n<p>\u9996\u5148\u662fSingle process\uff0c\u987e\u540d\u601d\u4e49\uff0c\u5355\u8fdb\u7a0b\u6a21\u5f0f\uff0c\u6240\u6709tab\u90fd\u4f1a\u4f7f\u7528\u540c\u4e00\u4e2a\u8fdb\u7a0b\u3002\u63a5\u4e0b\u6765\u662fProcess-per-tab \uff0c\u4e5f\u662f\u987e\u540d\u601d\u4e49\uff0c\u6bcf\u6253\u5f00\u4e00\u4e2atab\uff0c\u4f1a\u65b0\u5efa\u4e00\u4e2a\u8fdb\u7a0b\u3002\u800c\u5bf9\u4e8eProcess-per-site\uff0c\u5f53\u4f60\u6253\u5f00 a.baidu.com \u9875\u9762\uff0c\u5728\u6253\u5f00 b.baidu.com \u7684\u9875\u9762\uff0c\u8fd9\u4e24\u4e2a\u9875\u9762\u7684tab\u4f7f\u7528\u7684\u662f\u5171\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u56e0\u4e3a\u8fd9\u4e24\u4e2a\u9875\u9762\u7684site\u76f8\u540c\uff0c\u800c\u5982\u6b64\u4e00\u6765\uff0c\u5982\u679c\u5176\u4e2d\u4e00\u4e2atab\u5d29\u6e83\u4e86\uff0c\u800c\u53e6\u4e00\u4e2atab\u4e5f\u4f1a\u5d29\u6e83\u3002<\/p>\n<p>Process-per-site-instance \u662f\u6700\u91cd\u8981\u7684\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u662f Chrome \u9ed8\u8ba4\u4f7f\u7528\u7684\u6a21\u5f0f\uff0c\u4e5f\u5c31\u662f\u51e0\u4e4e\u6240\u6709\u7684\u7528\u6237\u90fd\u5728\u7528\u7684\u6a21\u5f0f\u3002\u5f53\u4f60\u6253\u5f00\u4e00\u4e2a tab \u8bbf\u95ee a.baidu.com \uff0c\u7136\u540e\u518d\u6253\u5f00\u4e00\u4e2a tab \u8bbf\u95ee b.baidu.com\uff0c\u8fd9\u4e24\u4e2a tab \u4f1a\u4f7f\u7528\u4e24\u4e2a\u8fdb\u7a0b\u3002\u800c\u5982\u679c\u4f60\u5728 a.baidu.com \u4e2d\uff0c\u901a\u8fc7JS\u4ee3\u7801\u6253\u5f00\u4e86 b.baidu.com \u9875\u9762\uff0c\u8fd9\u4e24\u4e2a tab \u4f1a\u4f7f\u7528\u540c\u4e00\u4e2a\u8fdb\u7a0b\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u9ed8\u8ba4\u6a21\u5f0f\u9009\u62e9<\/strong><\/div>\n<p>\u90a3\u4e48\u4e3a\u4ec0\u4e48\u6d4f\u89c8\u5668\u4f7f\u7528Process-per-site-instance\u4f5c\u4e3a\u9ed8\u8ba4\u7684\u8fdb\u7a0b\u6a21\u5f0f\u5462\uff1f<\/p>\n<p>Process-per-site-instance\u517c\u5bb9\u4e86\u6027\u80fd\u4e0e\u6613\u7528\u6027\uff0c\u662f\u4e00\u4e2a\u6bd4\u8f83\u4e2d\u5eb8\u901a\u7528\u7684\u6a21\u5f0f\u3002<\/p>\n<li>\u76f8\u8f83\u4e8e Process-per-tab\uff0c\u80fd\u591f\u5c11\u5f00\u5f88\u591a\u8fdb\u7a0b\uff0c\u5c31\u610f\u5473\u7740\u66f4\u5c11\u7684\u5185\u5b58\u5360\u7528<\/li>\n<li>\u76f8\u8f83\u4e8e Process-per-site\uff0c\u80fd\u591f\u66f4\u597d\u7684\u9694\u79bb\u76f8\u540c\u57df\u540d\u4e0b\u6beb\u65e0\u5173\u8054\u7684 tab\uff0c\u66f4\u52a0\u5b89\u5168<\/li>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u5bfc\u822a\u8fc7\u7a0b\u90fd\u53d1\u751f\u4e86\u4ec0\u4e48<\/strong><\/div>\n<p>\u524d\u9762\u6211\u4eec\u8bb2\u4e86\u6d4f\u89c8\u5668\u7684\u591a\u8fdb\u7a0b\u67b6\u6784\uff0c\u8bb2\u4e86\u591a\u8fdb\u7a0b\u67b6\u6784\u7684\u5404\u79cd\u597d\u5904\uff0c\u548cChrome\u662f\u600e\u4e48\u4f18\u5316\u591a\u8fdb\u7a0b\u67b6\u6784\u7684\uff0c\u4e0b\u9762\u4ece\u7528\u6237\u6d4f\u89c8\u7f51\u9875\u8fd9\u4e00\u7b80\u5355\u7684\u573a\u666f\uff0c\u6765\u6df1\u5165\u4e86\u89e3\u8fdb\u7a0b\u548c\u7ebf\u7a0b\u662f\u5982\u4f55\u5448\u73b0\u6211\u4eec\u7684\u7f51\u7ad9\u9875\u9762\u7684\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u7f51\u9875\u52a0\u8f7d\u8fc7\u7a0b<\/strong><\/div>\n<p>\u4e4b\u524d\u6211\u4eec\u6211\u4eec\u63d0\u5230\uff0ctab\u4ee5\u5916\u7684\u5927\u90e8\u5206\u5de5\u4f5c\u7531\u6d4f\u89c8\u5668\u8fdb\u7a0bBrowser Process\u8d1f\u8d23\uff0c\u9488\u5bf9\u5de5\u4f5c\u7684\u4e0d\u540c\uff0cBrowser Process \u5212\u5206\u51fa\u4e0d\u540c\u7684\u5de5\u4f5c\u7ebf\u7a0b\uff1a<\/p>\n<li>UI thread\uff1a\u63a7\u5236\u6d4f\u89c8\u5668\u4e0a\u7684\u6309\u94ae\u53ca\u8f93\u5165\u6846\uff1b<\/li>\n<li>network thread\uff1a\u5904\u7406\u7f51\u7edc\u8bf7\u6c42\uff0c\u4ece\u7f51\u4e0a\u83b7\u53d6\u6570\u636e\uff1b<\/li>\n<li>storage thread\uff1a \u63a7\u5236\u6587\u4ef6\u7b49\u7684\u8bbf\u95ee\uff1b<\/li>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/b3148fd5.png\" alt=\"\" width=\"600\" height=\"350\" class=\"alignnone size-full wp-image-191412\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/b3148fd5.png 600w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/b3148fd5-300x175.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"margin-top:2em;margin-bottom:1em\"><span style=\"color:#1E1E1E;letter-spacing: 2px;border-left:#FF3030 3px solid;border-right:#FF3030 3px solid;padding-left: 8px;padding-right:8px;font-size: 12pt\"><strong>\u7b2c\u4e00\u6b65\uff1a\u5904\u7406\u8f93\u5165<\/strong><\/span><\/div>\n<p>\u5f53\u6211\u4eec\u5728\u6d4f\u89c8\u5668\u7684\u5730\u5740\u680f\u8f93\u5165\u5185\u5bb9\u6309\u4e0b\u56de\u8f66\u65f6\uff0cUI thread\u4f1a\u5224\u65ad\u8f93\u5165\u7684\u5185\u5bb9\u662f\u641c\u7d22\u5173\u952e\u8bcd\uff08search query\uff09\u8fd8\u662fURL\uff0c\u5982\u679c\u662f\u641c\u7d22\u5173\u952e\u8bcd\uff0c\u8df3\u8f6c\u81f3\u9ed8\u8ba4\u641c\u7d22\u5f15\u64ce\u5bf9\u5e94\u90fd\u641c\u7d22URL\uff0c\u5982\u679c\u8f93\u5165\u7684\u5185\u5bb9\u662fURL\uff0c\u5219\u5f00\u59cb\u8bf7\u6c42URL\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/3dec03d.png\" alt=\"\" width=\"600\" height=\"350\" class=\"alignnone size-full wp-image-191413\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/3dec03d.png 600w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/3dec03d-300x175.png 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"margin-top:2em;margin-bottom:1em\"><span style=\"color:#1E1E1E;letter-spacing: 2px;border-left:#FF3030 3px solid;border-right:#FF3030 3px solid;padding-left: 8px;padding-right:8px;font-size: 12pt\"><strong>\u7b2c\u4e8c\u6b65\uff1a\u5f00\u59cb\u5bfc\u822a<\/strong><\/span><\/div>\n<p>\u56de\u8f66\u6309\u4e0b\u540e\uff0cUI thread\u5c06\u5173\u952e\u8bcd\u641c\u7d22\u5bf9\u5e94\u7684URL\u6216\u8f93\u5165\u7684URL\u4ea4\u7ed9\u7f51\u7edc\u7ebf\u7a0bNetwork thread\uff0c\u6b64\u65f6UI\u7ebf\u7a0b\u4f7fTab\u524d\u7684\u56fe\u6807\u5c55\u793a\u4e3a\u52a0\u8f7d\u4e2d\u72b6\u6001\uff0c\u7136\u540e\u7f51\u7edc\u8fdb\u7a0b\u8fdb\u884c\u4e00\u7cfb\u5217\u8bf8\u5982DNS\u5bfb\u5740\uff0c\u5efa\u7acbTLS\u8fde\u63a5\u7b49\u64cd\u4f5c\u8fdb\u884c\u8d44\u6e90\u8bf7\u6c42\uff0c\u5982\u679c\u6536\u5230\u670d\u52a1\u5668\u7684301\u91cd\u5b9a\u5411\u54cd\u5e94\uff0c\u5b83\u5c31\u4f1a\u544a\u77e5UI\u7ebf\u7a0b\u8fdb\u884c\u91cd\u5b9a\u5411\u7136\u540e\u5b83\u4f1a\u518d\u6b21\u53d1\u8d77\u4e00\u4e2a\u65b0\u7684\u7f51\u7edc\u8bf7\u6c42\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"margin-top:2em;margin-bottom:1em\"><span style=\"color:#1E1E1E;letter-spacing: 2px;border-left:#FF3030 3px solid;border-right:#FF3030 3px solid;padding-left: 8px;padding-right:8px;font-size: 12pt\"><strong>\u7b2c\u4e09\u6b65\uff1a\u8bfb\u53d6\u54cd\u5e94<\/strong><\/span><\/div>\n<p>network thread\u63a5\u6536\u5230\u670d\u52a1\u5668\u7684\u54cd\u5e94\u540e\uff0c\u5f00\u59cb\u89e3\u6790HTTP\u54cd\u5e94\u62a5\u6587\uff0c\u7136\u540e\u6839\u636e\u54cd\u5e94\u5934\u4e2d\u7684Content-Type\u5b57\u6bb5\u6765\u786e\u5b9a\u54cd\u5e94\u4e3b\u4f53\u7684\u5a92\u4f53\u7c7b\u578b\uff08MIME Type\uff09\uff0c\u5982\u679c\u5a92\u4f53\u7c7b\u578b\u662f\u4e00\u4e2aHTML\u6587\u4ef6\uff0c\u5219\u5c06\u54cd\u5e94\u6570\u636e\u4ea4\u7ed9\u6e32\u67d3\u8fdb\u7a0b\uff08renderer process\uff09\u6765\u8fdb\u884c\u4e0b\u4e00\u6b65\u7684\u5de5\u4f5c\uff0c\u5982\u679c\u662f zip \u6587\u4ef6\u6216\u8005\u5176\u5b83\u6587\u4ef6\uff0c\u4f1a\u628a\u76f8\u5173\u6570\u636e\u4f20\u8f93\u7ed9\u4e0b\u8f7d\u7ba1\u7406\u5668\u3002<\/p>\n<p>\u4e0e\u6b64\u540c\u65f6\uff0c\u6d4f\u89c8\u5668\u4f1a\u8fdb\u884c Safe Browsing \u5b89\u5168\u68c0\u67e5\uff0c\u5982\u679c\u57df\u540d\u6216\u8005\u8bf7\u6c42\u5185\u5bb9\u5339\u914d\u5230\u5df2\u77e5\u7684\u6076\u610f\u7ad9\u70b9\uff0cnetwork thread \u4f1a\u5c55\u793a\u4e00\u4e2a\u8b66\u544a\u9875\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u7f51\u7edc\u7ebf\u7a0b\u8fd8\u4f1a\u505a CORB\uff08Cross Origin Read Blocking\uff09\u68c0\u67e5\u6765\u786e\u5b9a\u90a3\u4e9b\u654f\u611f\u7684\u8de8\u7ad9\u6570\u636e\u4e0d\u4f1a\u88ab\u53d1\u9001\u81f3\u6e32\u67d3\u8fdb\u7a0b\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"margin-top:2em;margin-bottom:1em\"><span style=\"color:#1E1E1E;letter-spacing: 2px;border-left:#FF3030 3px solid;border-right:#FF3030 3px solid;padding-left: 8px;padding-right:8px;font-size: 12pt\"><strong>\u7b2c\u56db\u6b65\uff1a\u67e5\u627e\u6e32\u67d3\u8fdb\u7a0b<\/strong><\/span><\/div>\n<p>\u5404\u79cd\u68c0\u67e5\u5b8c\u6bd5\u4ee5\u540e\uff0cnetwork thread \u786e\u4fe1\u6d4f\u89c8\u5668\u53ef\u4ee5\u5bfc\u822a\u5230\u8bf7\u6c42\u7f51\u9875\uff0cnetwork thread \u4f1a\u901a\u77e5 UI thread \u6570\u636e\u5df2\u7ecf\u51c6\u5907\u597d\uff0cUI thread \u4f1a\u67e5\u627e\u5230\u4e00\u4e2a renderer process \u8fdb\u884c\u7f51\u9875\u7684\u6e32\u67d3\u3002<\/p>\n<p>\u6d4f\u89c8\u5668\u4e3a\u4e86\u5bf9\u67e5\u627e\u6e32\u67d3\u8fdb\u7a0b\u8fd9\u4e00\u6b65\u9aa4\u8fdb\u884c\u4f18\u5316\uff0c\u8003\u8651\u5230\u7f51\u7edc\u8bf7\u6c42\u83b7\u53d6\u54cd\u5e94\u9700\u8981\u65f6\u95f4\uff0c\u6240\u4ee5\u5728\u7b2c\u4e8c\u6b65\u5f00\u59cb\uff0c\u6d4f\u89c8\u5668\u5df2\u7ecf\u9884\u5148\u67e5\u627e\u548c\u542f\u52a8\u4e86\u4e00\u4e2a\u6e32\u67d3\u8fdb\u7a0b\uff0c\u5982\u679c\u4e2d\u95f4\u6b65\u9aa4\u4e00\u5207\u987a\u5229\uff0c\u5f53 network thread \u63a5\u6536\u5230\u6570\u636e\u65f6\uff0c\u6e32\u67d3\u8fdb\u7a0b\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\uff0c\u4f46\u662f\u5982\u679c\u9047\u5230\u91cd\u5b9a\u5411\uff0c\u8fd9\u4e2a\u51c6\u5907\u597d\u7684\u6e32\u67d3\u8fdb\u7a0b\u4e5f\u8bb8\u5c31\u4e0d\u53ef\u7528\u4e86\uff0c\u8fd9\u4e2a\u65f6\u5019\u4f1a\u91cd\u65b0\u542f\u52a8\u4e00\u4e2a\u6e32\u67d3\u8fdb\u7a0b\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"margin-top:2em;margin-bottom:1em\"><span style=\"color:#1E1E1E;letter-spacing: 2px;border-left:#FF3030 3px solid;border-right:#FF3030 3px solid;padding-left: 8px;padding-right:8px;font-size: 12pt\"><strong>\u7b2c\u4e94\u6b65\uff1a\u63d0\u4ea4\u5bfc\u822a<\/strong><\/span><\/div>\n<p>\u5230\u4e86\u8fd9\u4e00\u6b65\uff0c\u6570\u636e\u548c\u6e32\u67d3\u8fdb\u7a0b\u90fd\u51c6\u5907\u597d\u4e86\uff0cBrowser Process \u4f1a\u5411 Renderer Process \u53d1\u9001IPC\u6d88\u606f\u6765\u786e\u8ba4\u5bfc\u822a\uff0c\u6b64\u65f6\uff0c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u5c06\u51c6\u5907\u597d\u7684\u6570\u636e\u53d1\u9001\u7ed9\u6e32\u67d3\u8fdb\u7a0b\uff0c\u6e32\u67d3\u8fdb\u7a0b\u63a5\u6536\u5230\u6570\u636e\u4e4b\u540e\uff0c\u53c8\u53d1\u9001IPC\u6d88\u606f\u7ed9\u6d4f\u89c8\u5668\u8fdb\u7a0b\uff0c\u544a\u8bc9\u6d4f\u89c8\u5668\u8fdb\u7a0b\u5bfc\u822a\u5df2\u7ecf\u63d0\u4ea4\u4e86\uff0c\u9875\u9762\u5f00\u59cb\u52a0\u8f7d\u3002<\/p>\n<p>\u8fd9\u4e2a\u65f6\u5019\u5bfc\u822a\u680f\u4f1a\u66f4\u65b0\uff0c\u5b89\u5168\u6307\u793a\u7b26\u66f4\u65b0\uff08\u5730\u5740\u524d\u9762\u7684\u5c0f\u9501\uff09\uff0c\u8bbf\u95ee\u5386\u53f2\u5217\u8868\uff08history tab\uff09\u66f4\u65b0\uff0c\u5373\u53ef\u4ee5\u901a\u8fc7\u524d\u8fdb\u540e\u9000\u6765\u5207\u6362\u8be5\u9875\u9762\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"margin-top:2em;margin-bottom:1em\"><span style=\"color:#1E1E1E;letter-spacing: 2px;border-left:#FF3030 3px solid;border-right:#FF3030 3px solid;padding-left: 8px;padding-right:8px;font-size: 12pt\"><strong>\u7b2c\u516d\u6b65\uff1a\u521d\u59cb\u5316\u52a0\u8f7d\u5b8c\u6210<\/strong><\/span><\/div>\n<p>\u5f53\u5bfc\u822a\u63d0\u4ea4\u5b8c\u6210\u540e\uff0c\u6e32\u67d3\u8fdb\u7a0b\u5f00\u59cb\u52a0\u8f7d\u8d44\u6e90\u53ca\u6e32\u67d3\u9875\u9762\uff08\u8be6\u7ec6\u5185\u5bb9\u4e0b\u6587\u4ecb\u7ecd\uff09\uff0c\u5f53\u9875\u9762\u6e32\u67d3\u5b8c\u6210\u540e\uff08\u9875\u9762\u53ca\u5185\u90e8\u7684iframe\u90fd\u89e6\u53d1\u4e86onload\u4e8b\u4ef6\uff09\uff0c\u4f1a\u5411\u6d4f\u89c8\u5668\u8fdb\u7a0b\u53d1\u9001IPC\u6d88\u606f\uff0c\u544a\u77e5\u6d4f\u89c8\u5668\u8fdb\u7a0b\uff0c\u8fd9\u4e2a\u65f6\u5019UI thread\u4f1a\u505c\u6b62\u5c55\u793atab\u4e2d\u7684\u52a0\u8f7d\u4e2d\u56fe\u6807\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u7f51\u9875\u6e32\u67d3\u539f\u7406<\/strong><\/div>\n<p>\u5bfc\u822a\u8fc7\u7a0b\u5b8c\u6210\u4e4b\u540e\uff0c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u628a\u6570\u636e\u4ea4\u7ed9\u4e86\u6e32\u67d3\u8fdb\u7a0b\uff0c\u6e32\u67d3\u8fdb\u7a0b\u8d1f\u8d23tab\u5185\u7684\u6240\u6709\u4e8b\u60c5\uff0c\u6838\u5fc3\u76ee\u7684\u5c31\u662f\u5c06HTML\/CSS\/JS\u4ee3\u7801\uff0c\u8f6c\u5316\u4e3a\u7528\u6237\u53ef\u8fdb\u884c\u4ea4\u4e92\u7684web\u9875\u9762\u3002\u90a3\u4e48\u6e32\u67d3\u8fdb\u7a0b\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u5462\uff1f<\/p>\n<p>\u6e32\u67d3\u8fdb\u7a0b\u4e2d\uff0c\u5305\u542b\u7ebf\u7a0b\u5206\u522b\u662f\uff1a<\/p>\n<li> \u4e00\u4e2a\u4e3b\u7ebf\u7a0b\uff08main thread\uff09<\/li>\n<li>\u591a\u4e2a\u5de5\u4f5c\u7ebf\u7a0b\uff08work thread\uff09<\/li>\n<li>\u4e00\u4e2a\u5408\u6210\u5668\u7ebf\u7a0b\uff08compositor thread\uff09<\/li>\n<li>\u591a\u4e2a\u5149\u6805\u5316\u7ebf\u7a0b\uff08raster thread\uff09<\/li>\n<p>\u4e0d\u540c\u7684\u7ebf\u7a0b\uff0c\u6709\u7740\u4e0d\u540c\u7684\u5de5\u4f5c\u804c\u8d23\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u6784\u5efaDOM<\/strong><\/div>\n<p>\u5f53\u6e32\u67d3\u8fdb\u7a0b\u63a5\u53d7\u5230\u5bfc\u822a\u7684\u786e\u8ba4\u4fe1\u606f\u540e\uff0c\u5f00\u59cb\u63a5\u53d7\u6765\u81ea\u6d4f\u89c8\u5668\u8fdb\u7a0b\u7684\u6570\u636e\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0c\u4e3b\u7ebf\u7a0b\u4f1a\u89e3\u6790\u6570\u636e\u8f6c\u5316\u4e3aDOM\uff08Document Object Model\uff09\u5bf9\u8c61\u3002<\/p>\n<p>DOM\u4e3aWEB\u5f00\u53d1\u4eba\u5458\u901a\u8fc7JavaScript\u4e0e\u7f51\u9875\u8fdb\u884c\u4ea4\u4e92\u7684\u6570\u636e\u7ed3\u6784\u53caAPI\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u8d44\u6e90\u5b50\u52a0\u8f7d<\/strong><\/div>\n<p>\u5728\u6784\u5efaDOM\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u89e3\u6790\u5230\u56fe\u7247\u3001CSS\u3001JavaScript\u811a\u672c\u7b49\u8d44\u6e90\uff0c\u8fd9\u4e9b\u8d44\u6e90\u662f\u9700\u8981\u4ece\u7f51\u7edc\u6216\u8005\u7f13\u5b58\u4e2d\u83b7\u53d6\u7684\uff0c\u4e3b\u7ebf\u7a0b\u5728\u6784\u5efaDOM\u8fc7\u7a0b\u4e2d\u5982\u679c\u9047\u5230\u4e86\u8fd9\u4e9b\u8d44\u6e90\uff0c\u9010\u4e00\u53d1\u8d77\u8bf7\u6c42\u53bb\u83b7\u53d6\uff0c\u800c\u4e3a\u4e86\u63d0\u5347\u6548\u7387\uff0c\u6d4f\u89c8\u5668\u4e5f\u4f1a\u8fd0\u884c\u9884\u52a0\u8f7d\u626b\u63cf\uff08preload scanner\uff09\u7a0b\u5e8f\uff0c\u5982\u679c\u5982\u679cHTML\u4e2d\u5b58\u5728img\u3001link\u7b49\u6807\u7b7e\uff0c\u9884\u52a0\u8f7d\u626b\u63cf\u7a0b\u5e8f\u4f1a\u628a\u8fd9\u4e9b\u8bf7\u6c42\u4f20\u9012\u7ed9Browser Process\u7684network thread\u8fdb\u884c\u8d44\u6e90\u4e0b\u8f7d\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>JavaScript\u7684\u4e0b\u8f7d\u4e0e\u6267\u884c<\/strong><\/div>\n<p>\u6784\u5efaDOM\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u9047\u5230<script>\u6807\u7b7e\uff0c\u6e32\u67d3\u5f15\u64ce\u4f1a\u505c\u6b62\u5bf9HTML\u7684\u89e3\u6790\uff0c\u800c\u53bb\u52a0\u8f7d\u6267\u884cJS\u4ee3\u7801\uff0c\u539f\u56e0\u5728\u4e8eJS\u4ee3\u7801\u53ef\u80fd\u4f1a\u6539\u53d8DOM\u7684\u7ed3\u6784\uff08\u6bd4\u5982\u6267\u884cdocument.write()\u7b49API\uff09<\/p>\n<p>\u4e0d\u8fc7\u5f00\u53d1\u8005\u5176\u5b9e\u4e5f\u6709\u591a\u79cd\u65b9\u5f0f\u6765\u544a\u77e5\u6d4f\u89c8\u5668\u5e94\u5bf9\u5982\u4f55\u5e94\u5bf9\u67d0\u4e2a\u8d44\u6e90\uff0c\u6bd4\u5982\u8bf4\u5982\u679c\u5728<\/script><script> \u6807\u7b7e\u4e0a\u6dfb\u52a0\u4e86 async \u6216 defer \u7b49\u5c5e\u6027\uff0c\u6d4f\u89c8\u5668\u4f1a\u5f02\u6b65\u7684\u52a0\u8f7d\u548c\u6267\u884cJS\u4ee3\u7801\uff0c\u800c\u4e0d\u4f1a\u963b\u585e\u6e32\u67d3\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u6837\u5f0f\u8ba1\u7b97 - Style calculation<\/strong><\/div>\n<p>DOM\u6811\u53ea\u662f\u6211\u4eec\u9875\u9762\u7684\u7ed3\u6784\uff0c\u6211\u4eec\u8981\u77e5\u9053\u9875\u9762\u957f\u4ec0\u4e48\u6837\u5b50\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u77e5\u9053DOM\u7684\u6bcf\u4e00\u4e2a\u8282\u70b9\u7684\u6837\u5f0f\u3002\u4e3b\u7ebf\u7a0b\u5728\u89e3\u6790\u9875\u9762\u65f6\uff0c\u9047\u5230<\/p>\n<style>\u6807\u7b7e\u6216\u8005<link \/>\u6807\u7b7e\u7684CSS\u8d44\u6e90\uff0c\u4f1a\u52a0\u8f7dCSS\u4ee3\u7801\uff0c\u6839\u636eCSS\u4ee3\u7801\u786e\u5b9a\u6bcf\u4e2aDOM\u8282\u70b9\u7684\u8ba1\u7b97\u6837\u5f0f\uff08computed style\uff09\u3002<\/p>\n<p>\u8ba1\u7b97\u6837\u5f0f\u662f\u4e3b\u7ebf\u7a0b\u6839\u636eCSS\u6837\u5f0f\u9009\u62e9\u5668\uff08CSS selectors\uff09\u8ba1\u7b97\u51fa\u7684\u6bcf\u4e2aDOM\u5143\u7d20\u5e94\u8be5\u5177\u5907\u7684\u5177\u4f53\u6837\u5f0f\uff0c\u5373\u4f7f\u4f60\u7684\u9875\u9762\u6ca1\u6709\u8bbe\u7f6e\u4efb\u4f55\u81ea\u5b9a\u4e49\u7684\u6837\u5f0f\uff0c\u6d4f\u89c8\u5668\u4e5f\u4f1a\u63d0\u4f9b\u5176\u9ed8\u8ba4\u7684\u6837\u5f0f\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u5e03\u5c40 - Layout<\/strong><\/div>\n<p>DOM\u6811\u548c\u8ba1\u7b97\u6837\u5f0f\u5b8c\u6210\u540e\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u77e5\u9053\u6bcf\u4e00\u4e2a\u8282\u70b9\u5728\u9875\u9762\u4e0a\u7684\u4f4d\u7f6e\uff0c\u5e03\u5c40\uff08Layout\uff09\u5176\u5b9e\u5c31\u662f\u627e\u5230\u6240\u6709\u5143\u7d20\u7684\u51e0\u4f55\u5173\u7cfb\u7684\u8fc7\u7a0b\u3002<\/p>\n<p>\u4e3b\u7ebf\u7a0b\u4f1a\u904d\u5386DOM \u53ca\u76f8\u5173\u5143\u7d20\u7684\u8ba1\u7b97\u6837\u5f0f\uff0c\u6784\u5efa\u51fa\u5305\u542b\u6bcf\u4e2a\u5143\u7d20\u7684\u9875\u9762\u5750\u6807\u4fe1\u606f\u53ca\u76d2\u5b50\u6a21\u578b\u5927\u5c0f\u7684\u5e03\u5c40\u6811\uff08Render Tree\uff09\uff0c\u904d\u5386\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u8df3\u8fc7\u9690\u85cf\u7684\u5143\u7d20\uff08display: none\uff09\uff0c\u53e6\u5916\uff0c\u4f2a\u5143\u7d20\u867d\u7136\u5728DOM\u4e0a\u4e0d\u53ef\u89c1\uff0c\u4f46\u662f\u5728\u5e03\u5c40\u6811\u4e0a\u662f\u53ef\u89c1\u7684\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u7ed8\u5236 - Paint<\/strong><\/div>\n<p>\u5e03\u5c40 layout \u4e4b\u540e\uff0c\u6211\u4eec\u77e5\u9053\u4e86\u4e0d\u540c\u5143\u7d20\u7684\u7ed3\u6784\uff0c\u6837\u5f0f\uff0c\u51e0\u4f55\u5173\u7cfb\uff0c\u6211\u4eec\u8981\u7ed8\u5236\u51fa\u4e00\u4e2a\u9875\u9762\uff0c\u6211\u4eec\u8981\u9700\u8981\u77e5\u9053\u6bcf\u4e2a\u5143\u7d20\u7684\u7ed8\u5236\u5148\u540e\u987a\u5e8f\uff0c\u5728\u7ed8\u5236\u9636\u6bb5\uff0c\u4e3b\u7ebf\u7a0b\u4f1a\u904d\u5386\u5e03\u5c40\u6811\uff08layout tree\uff09\uff0c\u751f\u6210\u4e00\u7cfb\u5217\u7684\u7ed8\u753b\u8bb0\u5f55\uff08paint records\uff09\u3002\u7ed8\u753b\u8bb0\u5f55\u53ef\u4ee5\u770b\u505a\u662f\u8bb0\u5f55\u5404\u5143\u7d20\u7ed8\u5236\u5148\u540e\u987a\u5e8f\u7684\u7b14\u8bb0\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u5408\u6210 - Compositing<\/strong><\/div>\n<p>\u6587\u6863\u7ed3\u6784\u3001\u5143\u7d20\u7684\u6837\u5f0f\u3001\u5143\u7d20\u7684\u51e0\u4f55\u5173\u7cfb\u3001\u7ed8\u753b\u987a\u5e8f\uff0c\u8fd9\u4e9b\u4fe1\u606f\u6211\u4eec\u90fd\u6709\u4e86\uff0c\u8fd9\u4e2a\u65f6\u5019\u5982\u679c\u8981\u7ed8\u5236\u4e00\u4e2a\u9875\u9762\uff0c\u6211\u4eec\u9700\u8981\u505a\u7684\u662f\u628a\u8fd9\u4e9b\u4fe1\u606f\u8f6c\u5316\u4e3a\u663e\u793a\u5668\u4e2d\u7684\u50cf\u7d20\uff0c\u8fd9\u4e2a\u8f6c\u5316\u7684\u8fc7\u7a0b\uff0c\u53eb\u505a\u5149\u6805\u5316\uff08rasterizing\uff09\u3002<\/p>\n<p>\u90a3\u6211\u4eec\u8981\u7ed8\u5236\u4e00\u4e2a\u9875\u9762\uff0c\u6700\u7b80\u5355\u7684\u505a\u6cd5\u662f\u53ea\u5149\u6805\u5316\u89c6\u53e3\u5185\uff08viewport\uff09\u7684\u7f51\u9875\u5185\u5bb9\uff0c\u5982\u679c\u7528\u6237\u8fdb\u884c\u4e86\u9875\u9762\u6eda\u52a8\uff0c\u5c31\u79fb\u52a8\u5149\u6805\u5e27\uff08rastered frame\uff09\u5e76\u4e14\u5149\u6805\u5316\u66f4\u591a\u7684\u5185\u5bb9\u4ee5\u8865\u4e0a\u9875\u9762\u7f3a\u5931\u7684\u90e8\u5206\uff0c\u5982\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/05\/11111111111111111111111.gif\" alt=\"\" width=\"480\" height=\"300\" class=\"alignnone size-full wp-image-191416\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u6700\u7b80\u5355\u7684\u5149\u6805\u5316\u8fc7\u7a0b<\/strong><\/div>\n<p>Chrome\u7b2c\u4e00\u4e2a\u7248\u672c\u5c31\u662f\u91c7\u7528\u8fd9\u79cd\u7b80\u5355\u7684\u7ed8\u5236\u65b9\u5f0f\uff0c\u8fd9\u4e00\u65b9\u5f0f\u552f\u4e00\u7684\u7f3a\u70b9\u5c31\u662f\u6bcf\u5f53\u9875\u9762\u6eda\u52a8\uff0c\u5149\u6805\u7ebf\u7a0b\u90fd\u9700\u8981\u5bf9\u65b0\u79fb\u8fdb\u89c6\u56fe\u7684\u5185\u5bb9\u8fdb\u884c\u5149\u6805\u5316\uff0c\u8fd9\u662f\u4e00\u5b9a\u7684\u6027\u80fd\u635f\u8017\uff0c\u4e3a\u4e86\u4f18\u5316\u8fd9\u79cd\u60c5\u51b5\uff0cChrome\u91c7\u53d6\u4e00\u79cd\u66f4\u52a0\u590d\u6742\u7684\u53eb\u505a\u5408\u6210\uff08compositing\uff09\u7684\u505a\u6cd5\u3002<\/p>\n<p>\u90a3\u4e48\uff0c\u4ec0\u4e48\u662f\u5408\u6210\uff1f\u5408\u6210\u662f\u4e00\u79cd\u5c06\u9875\u9762\u5206\u6210\u82e5\u5e72\u5c42\uff0c\u7136\u540e\u5206\u522b\u5bf9\u5b83\u4eec\u8fdb\u884c\u5149\u6805\u5316\uff0c\u6700\u540e\u5728\u4e00\u4e2a\u5355\u72ec\u7684\u7ebf\u7a0b - \u5408\u6210\u7ebf\u7a0b\uff08compositor thread\uff09\u91cc\u9762\u5408\u5e76\u6210\u4e00\u4e2a\u9875\u9762\u7684\u6280\u672f\u3002\u5f53\u7528\u6237\u6eda\u52a8\u9875\u9762\u65f6\uff0c\u7531\u4e8e\u9875\u9762\u5404\u4e2a\u5c42\u90fd\u5df2\u7ecf\u88ab\u5149\u6805\u5316\u4e86\uff0c\u6d4f\u89c8\u5668\u9700\u8981\u505a\u7684\u53ea\u662f\u5408\u6210\u4e00\u4e2a\u65b0\u7684\u5e27\u6765\u5c55\u793a\u6eda\u52a8\u540e\u7684\u6548\u679c\u7f62\u4e86\u3002\u9875\u9762\u7684\u52a8\u753b\u6548\u679c\u5b9e\u73b0\u4e5f\u662f\u7c7b\u4f3c\uff0c\u5c06\u9875\u9762\u4e0a\u7684\u5c42\u8fdb\u884c\u79fb\u52a8\u5e76\u6784\u5efa\u51fa\u4e00\u4e2a\u65b0\u7684\u5e27\u5373\u53ef\u3002\n\u4e3a\u4e86\u5b9e\u73b0\u5408\u6210\u6280\u672f\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u5143\u7d20\u8fdb\u884c\u5206\u5c42\uff0c\u786e\u5b9a\u54ea\u4e9b\u5143\u7d20\u9700\u8981\u653e\u7f6e\u5728\u54ea\u4e00\u5c42\uff0c\u4e3b\u7ebf\u7a0b\u9700\u8981\u904d\u5386\u6e32\u67d3\u6811\u6765\u521b\u5efa\u4e00\u68f5\u5c42\u6b21\u6811\uff08Layer Tree\uff09\uff0c\u5bf9\u4e8e\u6dfb\u52a0\u4e86 will-change CSS \u5c5e\u6027\u7684\u5143\u7d20\uff0c\u4f1a\u88ab\u770b\u505a\u5355\u72ec\u7684\u4e00\u5c42\uff0c\u6ca1\u6709 will-change CSS\u5c5e\u6027\u7684\u5143\u7d20\uff0c\u6d4f\u89c8\u5668\u4f1a\u6839\u636e\u60c5\u51b5\u51b3\u5b9a\u662f\u5426\u8981\u628a\u8be5\u5143\u7d20\u653e\u5728\u5355\u72ec\u7684\u5c42<\/p>\n<p>\u4f60\u53ef\u80fd\u4f1a\u60f3\u8981\u7ed9\u9875\u9762\u4e0a\u6240\u6709\u7684\u5143\u7d20\u4e00\u4e2a\u5355\u72ec\u7684\u5c42\uff0c\u7136\u800c\u5f53\u9875\u9762\u7684\u5c42\u8d85\u8fc7\u4e00\u5b9a\u7684\u6570\u91cf\u540e\uff0c\u5c42\u7684\u5408\u6210\u64cd\u4f5c\u8981\u6bd4\u5728\u6bcf\u4e2a\u5e27\u4e2d\u5149\u6805\u5316\u9875\u9762\u7684\u4e00\u5c0f\u90e8\u5206\u8fd8\u8981\u6162\uff0c\u56e0\u6b64\u8861\u91cf\u4f60\u5e94\u7528\u7684\u6e32\u67d3\u6027\u80fd\u662f\u5341\u5206\u91cd\u8981\u7684\u4e00\u4ef6\u4e8b\u60c5\u3002<\/p>\n<p>\u4e00\u65e6Layer Tress\u88ab\u521b\u5efa\uff0c\u6e32\u67d3\u987a\u5e8f\u88ab\u786e\u5b9a\uff0c\u4e3b\u7ebf\u7a0b\u4f1a\u628a\u8fd9\u4e9b\u4fe1\u606f\u901a\u77e5\u7ed9\u5408\u6210\u5668\u7ebf\u7a0b\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u5f00\u59cb\u5bf9\u5c42\u6b21\u6570\u7684\u6bcf\u4e00\u5c42\u8fdb\u884c\u5149\u6805\u5316\u3002\u6709\u7684\u5c42\u7684\u53ef\u4ee5\u8fbe\u5230\u6574\u4e2a\u9875\u9762\u7684\u5927\u5c0f\uff0c\u6240\u4ee5\u5408\u6210\u7ebf\u7a0b\u9700\u8981\u5c06\u5b83\u4eec\u5207\u5206\u4e3a\u4e00\u5757\u53c8\u4e00\u5757\u7684\u5c0f\u56fe\u5757\uff08tiles\uff09\uff0c\u4e4b\u540e\u5c06\u8fd9\u4e9b\u5c0f\u56fe\u5757\u5206\u522b\u8fdb\u884c\u53d1\u9001\u7ed9\u4e00\u7cfb\u5217\u5149\u6805\u7ebf\u7a0b\uff08raster threads\uff09\u8fdb\u884c\u5149\u6805\u5316\uff0c\u7ed3\u675f\u540e\u5149\u6805\u7ebf\u7a0b\u4f1a\u5c06\u6bcf\u4e2a\u56fe\u5757\u7684\u5149\u6805\u7ed3\u679c\u5b58\u5728GPU Process\u7684\u5185\u5b58\u4e2d\u3002<\/p>\n<p>\u4e3a\u4e86\u4f18\u5316\u663e\u793a\u4f53\u9a8c\uff0c\u5408\u6210\u7ebf\u7a0b\u53ef\u4ee5\u7ed9\u4e0d\u540c\u7684\u5149\u6805\u7ebf\u7a0b\u8d4b\u4e88\u4e0d\u540c\u7684\u4f18\u5148\u7ea7\uff0c\u5c06\u90a3\u4e9b\u5728\u89c6\u53e3\u4e2d\u7684\u6216\u8005\u89c6\u53e3\u9644\u8fd1\u7684\u5c42\u5148\u88ab\u5149\u6805\u5316\u3002<\/p>\n<p>\u5f53\u56fe\u5c42\u4e0a\u9762\u7684\u56fe\u5757\u90fd\u88ab\u6805\u683c\u5316\u540e\uff0c\u5408\u6210\u7ebf\u7a0b\u4f1a\u6536\u96c6\u56fe\u5757\u4e0a\u9762\u53eb\u505a\u7ed8\u753b\u56db\u8fb9\u5f62\uff08draw quads\uff09\u7684\u4fe1\u606f\u6765\u6784\u5efa\u4e00\u4e2a\u5408\u6210\u5e27\uff08compositor frame\uff09\u3002<\/p>\n<li>\u7ed8\u753b\u56db\u8fb9\u5f62\uff1a\u5305\u542b\u56fe\u5757\u5728\u5185\u5b58\u7684\u4f4d\u7f6e\u4ee5\u53ca\u56fe\u5c42\u5408\u6210\u540e\u56fe\u5757\u5728\u9875\u9762\u7684\u4f4d\u7f6e\u4e4b\u7c7b\u7684\u4fe1\u606f\u3002<\/li>\n<li>\u5408\u6210\u5e27\uff1a\u4ee3\u8868\u9875\u9762\u4e00\u4e2a\u5e27\u7684\u5185\u5bb9\u7684\u7ed8\u5236\u56db\u8fb9\u5f62\u96c6\u5408\u3002<\/li>\n<p>\u4ee5\u4e0a\u6240\u6709\u6b65\u9aa4\u5b8c\u6210\u540e\uff0c\u5408\u6210\u7ebf\u7a0b\u5c31\u4f1a\u901a\u8fc7IPC\u5411\u6d4f\u89c8\u5668\u8fdb\u7a0b\uff08browser process\uff09\u63d0\u4ea4\uff08commit\uff09\u4e00\u4e2a\u6e32\u67d3\u5e27\u3002\u8fd9\u4e2a\u65f6\u5019\u53ef\u80fd\u6709\u53e6\u5916\u4e00\u4e2a\u5408\u6210\u5e27\u88ab\u6d4f\u89c8\u5668\u8fdb\u7a0b\u7684UI\u7ebf\u7a0b\uff08UI thread\uff09\u63d0\u4ea4\u4ee5\u6539\u53d8\u6d4f\u89c8\u5668\u7684UI\u3002\u8fd9\u4e9b\u5408\u6210\u5e27\u90fd\u4f1a\u88ab\u53d1\u9001\u7ed9GPU\u4ece\u800c\u5c55\u793a\u5728\u5c4f\u5e55\u4e0a\u3002\u5982\u679c\u5408\u6210\u7ebf\u7a0b\u6536\u5230\u9875\u9762\u6eda\u52a8\u7684\u4e8b\u4ef6\uff0c\u5408\u6210\u7ebf\u7a0b\u4f1a\u6784\u5efa\u53e6\u5916\u4e00\u4e2a\u5408\u6210\u5e27\u53d1\u9001\u7ed9GPU\u6765\u66f4\u65b0\u9875\u9762\u3002<\/p>\n<p>\u5408\u6210\u7684\u597d\u5904\u5728\u4e8e\u8fd9\u4e2a\u8fc7\u7a0b\u6ca1\u6709\u6d89\u53ca\u5230\u4e3b\u7ebf\u7a0b\uff0c\u6240\u4ee5\u5408\u6210\u7ebf\u7a0b\u4e0d\u9700\u8981\u7b49\u5f85\u6837\u5f0f\u7684\u8ba1\u7b97\u4ee5\u53caJavaScript\u5b8c\u6210\u6267\u884c\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5408\u6210\u5668\u76f8\u5173\u7684\u52a8\u753b\u6700\u6d41\u7545\uff0c\u5982\u679c\u67d0\u4e2a\u52a8\u753b\u6d89\u53ca\u5230\u5e03\u5c40\u6216\u8005\u7ed8\u5236\u7684\u8c03\u6574\uff0c\u5c31\u4f1a\u6d89\u53ca\u5230\u4e3b\u7ebf\u7a0b\u7684\u91cd\u65b0\u8ba1\u7b97\uff0c\u81ea\u7136\u4f1a\u6162\u5f88\u591a\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u6d4f\u89c8\u5668\u5bf9\u4e8b\u4ef6\u7684\u5904\u7406<\/strong><\/div>\n<p>\u5f53\u9875\u9762\u6e32\u67d3\u5b8c\u6bd5\u4ee5\u540e\uff0cTAB\u5185\u5df2\u7ecf\u663e\u793a\u51fa\u4e86\u53ef\u4ea4\u4e92\u7684WEB\u9875\u9762\uff0c\u7528\u6237\u53ef\u4ee5\u8fdb\u884c\u79fb\u52a8\u9f20\u6807\u3001\u70b9\u51fb\u9875\u9762\u7b49\u64cd\u4f5c\u4e86\uff0c\u800c\u5f53\u8fd9\u4e9b\u4e8b\u4ef6\u53d1\u751f\u65f6\u5019\uff0c\u6d4f\u89c8\u5668\u662f\u5982\u4f55\u5904\u7406\u8fd9\u4e9b\u4e8b\u4ef6\u7684\u5462\uff1f<\/p>\n<p>\u4ee5\u70b9\u51fb\u4e8b\u4ef6\uff08click event\uff09\u4e3a\u4f8b\uff0c\u8ba9\u9f20\u6807\u70b9\u51fb\u9875\u9762\u65f6\u5019\uff0c\u9996\u5148\u63a5\u53d7\u5230\u4e8b\u4ef6\u4fe1\u606f\u7684\u662fBrowser Process\uff0c\u4f46\u662fBrowser Process\u53ea\u77e5\u9053\u4e8b\u4ef6\u53d1\u751f\u7684\u7c7b\u578b\u548c\u53d1\u751f\u7684\u4f4d\u7f6e\uff0c\u5177\u4f53\u600e\u4e48\u5bf9\u8fd9\u4e2a\u70b9\u51fb\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\uff0c\u8fd8\u662f\u7531Tab\u5185\u7684Renderer Process\u8fdb\u884c\u7684\u3002Browser Process\u63a5\u53d7\u5230\u4e8b\u4ef6\u540e\uff0c\u968f\u540e\u4fbf\u628a\u4e8b\u4ef6\u7684\u4fe1\u606f\u4f20\u9012\u7ed9\u4e86\u6e32\u67d3\u8fdb\u7a0b\uff0c\u6e32\u67d3\u8fdb\u7a0b\u4f1a\u627e\u5230\u6839\u636e\u4e8b\u4ef6\u53d1\u751f\u7684\u5750\u6807\uff0c\u627e\u5230\u76ee\u6807\u5bf9\u8c61\uff08target\uff09\uff0c\u5e76\u4e14\u8fd0\u884c\u8fd9\u4e2a\u76ee\u6807\u5bf9\u8c61\u7684\u70b9\u51fb\u4e8b\u4ef6\u7ed1\u5b9a\u7684\u76d1\u542c\u51fd\u6570\uff08listener\uff09\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u5408\u6210\u5668\u7ebf\u7a0b\u63a5\u6536\u4e8b\u4ef6<\/strong><\/div>\n<p>\u524d\u9762\u6211\u4eec\u8bf4\u5230\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u53ef\u4ee5\u72ec\u7acb\u4e8e\u4e3b\u7ebf\u7a0b\u4e4b\u5916\u901a\u8fc7\u5df2\u5149\u6805\u5316\u7684\u5c42\u521b\u5efa\u7ec4\u5408\u5e27\uff0c\u4f8b\u5982\u9875\u9762\u6eda\u52a8\uff0c\u5982\u679c\u6ca1\u6709\u5bf9\u9875\u9762\u6eda\u52a8\u7ed1\u5b9a\u76f8\u5173\u7684\u4e8b\u4ef6\uff0c\u7ec4\u5408\u5668\u7ebf\u7a0b\u53ef\u4ee5\u72ec\u7acb\u4e8e\u4e3b\u7ebf\u7a0b\u521b\u5efa\u7ec4\u5408\u5e27\uff0c\u5982\u679c\u9875\u9762\u7ed1\u5b9a\u4e86\u9875\u9762\u6eda\u52a8\u4e8b\u4ef6\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u4f1a\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u8fdb\u884c\u4e8b\u4ef6\u5904\u7406\u540e\u624d\u4f1a\u521b\u5efa\u7ec4\u5408\u5e27\u3002\u90a3\u4e48\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u662f\u5982\u4f55\u5224\u65ad\u51fa\u8fd9\u4e2a\u4e8b\u4ef6\u662f\u5426\u9700\u8981\u8def\u7531\u7ed9\u4e3b\u7ebf\u7a0b\u5904\u7406\u7684\u5462\uff1f<\/p>\n<p>\u7531\u4e8e\u6267\u884c JS \u662f\u4e3b\u7ebf\u7a0b\u7684\u5de5\u4f5c\uff0c\u5f53\u9875\u9762\u5408\u6210\u65f6\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u4f1a\u6807\u8bb0\u9875\u9762\u4e2d\u7ed1\u5b9a\u6709\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u533a\u57df\u4e3a\u975e\u5feb\u901f\u6eda\u52a8\u533a\u57df(non-fast scrollable region)\uff0c\u5982\u679c\u4e8b\u4ef6\u53d1\u751f\u5728\u8fd9\u4e9b\u5b58\u5728\u6807\u6ce8\u7684\u533a\u57df\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u4f1a\u628a\u4e8b\u4ef6\u4fe1\u606f\u53d1\u9001\u7ed9\u4e3b\u7ebf\u7a0b\uff0c\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u8fdb\u884c\u4e8b\u4ef6\u5904\u7406\uff0c\u5982\u679c\u4e8b\u4ef6\u4e0d\u662f\u53d1\u751f\u5728\u8fd9\u4e9b\u533a\u57df\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u5219\u4f1a\u76f4\u63a5\u5408\u6210\u65b0\u7684\u5e27\u800c\u4e0d\u7528\u7b49\u5230\u4e3b\u7ebf\u7a0b\u7684\u54cd\u5e94\u3002<\/p>\n<p>\u800c\u5bf9\u4e8e\u975e\u5feb\u901f\u6eda\u52a8\u533a\u57df\u7684\u6807\u8bb0\uff0c\u5f00\u53d1\u8005\u9700\u8981\u6ce8\u610f\u5168\u5c40\u4e8b\u4ef6\u7684\u7ed1\u5b9a\uff0c\u6bd4\u5982\u6211\u4eec\u4f7f\u7528\u4e8b\u4ef6\u59d4\u6258\uff0c\u5c06\u76ee\u6807\u5143\u7d20\u7684\u4e8b\u4ef6\u4ea4\u7ed9\u6839\u5143\u7d20body\u8fdb\u884c\u5904\u7406\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>document.body.addEventListener('touchstart', event => {  \r\n  if (event.target === area) {  \r\n    event.preventDefault()  \r\n  }  \r\n}) <\/pre>\n<p>\u5728\u5f00\u53d1\u8005\u89d2\u5ea6\u770b\uff0c\u8fd9\u4e00\u6bb5\u4ee3\u7801\u6ca1\u4ec0\u4e48\u95ee\u9898\uff0c\u4f46\u662f\u4ece\u6d4f\u89c8\u5668\u89d2\u5ea6\u770b\uff0c\u8fd9\u4e00\u6bb5\u4ee3\u7801\u7ed9body\u5143\u7d20\u7ed1\u5b9a\u4e86\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u4e5f\u5c31\u610f\u5473\u7740\u6574\u4e2a\u9875\u9762\u90fd\u88ab\u7f16\u8f91\u4e3a\u4e00\u4e2a\u975e\u5feb\u901f\u6eda\u52a8\u533a\u57df\uff0c\u8fd9\u4f1a\u4f7f\u5f97\u5373\u4f7f\u4f60\u7684\u9875\u9762\u7684\u67d0\u4e9b\u533a\u57df\u6ca1\u6709\u7ed1\u5b9a\u4efb\u4f55\u4e8b\u4ef6\uff0c\u6bcf\u6b21\u7528\u6237\u89e6\u53d1\u4e8b\u4ef6\u65f6\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u4e5f\u9700\u8981\u548c\u4e3b\u7ebf\u7a0b\u901a\u4fe1\u5e76\u7b49\u5f85\u53cd\u9988\uff0c\u6d41\u7545\u7684\u5408\u6210\u5668\u72ec\u7acb\u5904\u7406\u5408\u6210\u5e27\u7684\u6a21\u5f0f\u5c31\u5931\u6548\u4e86\u3002<\/p>\n<p>\u5176\u5b9e\u8fd9\u79cd\u60c5\u51b5\u4e5f\u5f88\u597d\u5904\u7406\uff0c\u53ea\u9700\u8981\u5728\u4e8b\u4ef6\u76d1\u542c\u65f6\u4f20\u9012passtive\u53c2\u6570\u4e3a true\uff0cpasstive\u4f1a\u544a\u8bc9\u6d4f\u89c8\u5668\u4f60\u65e2\u8981\u7ed1\u5b9a\u4e8b\u4ef6\uff0c\u53c8\u8981\u8ba9\u7ec4\u5408\u5668\u7ebf\u7a0b\u76f4\u63a5\u8df3\u8fc7\u4e3b\u7ebf\u7a0b\u7684\u4e8b\u4ef6\u5904\u7406\u76f4\u63a5\u5408\u6210\u521b\u5efa\u7ec4\u5408\u5e27\u3002<\/p>\n<pre>document.body.addEventListener('touchstart', \u2028event => {  \r\n    if (event.target === area) {  \r\n        event.preventDefault()  \r\n    }  \r\n }, {passive: true}); <\/pre>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u67e5\u627e\u4e8b\u4ef6\u7684\u76ee\u6807\u5bf9\u8c61\uff08event target\uff09<\/strong><\/div>\n<p>\u5f53\u5408\u6210\u5668\u7ebf\u7a0b\u63a5\u6536\u5230\u4e8b\u4ef6\u4fe1\u606f\uff0c\u5224\u5b9a\u5230\u4e8b\u4ef6\u53d1\u751f\u4e0d\u5728\u975e\u5feb\u901f\u6eda\u52a8\u533a\u57df\u540e\uff0c\u5408\u6210\u5668\u7ebf\u7a0b\u4f1a\u5411\u4e3b\u7ebf\u7a0b\u53d1\u9001\u8fd9\u4e2a\u65f6\u95f4\u4fe1\u606f\uff0c\u4e3b\u7ebf\u7a0b\u83b7\u53d6\u5230\u4e8b\u4ef6\u4fe1\u606f\u7684\u7b2c\u4e00\u4ef6\u4e8b\u5c31\u662f\u901a\u8fc7\u547d\u4e2d\u6d4b\u8bd5\uff08hit test\uff09\u53bb\u627e\u5230\u4e8b\u4ef6\u7684\u76ee\u6807\u5bf9\u8c61\u3002\u5177\u4f53\u7684\u547d\u4e2d\u6d4b\u8bd5\u6d41\u7a0b\u662f\u904d\u5386\u5728\u7ed8\u5236\u9636\u6bb5\u751f\u6210\u7684\u7ed8\u753b\u8bb0\u5f55\uff08paint records\uff09\u6765\u627e\u5230\u5305\u542b\u4e86\u4e8b\u4ef6\u53d1\u751f\u5750\u6807\u4e0a\u7684\u5143\u7d20\u5bf9\u8c61\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 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