{"id":210,"date":"2022-03-06T00:23:36","date_gmt":"2022-03-05T16:23:36","guid":{"rendered":"https:\/\/www.hgostand.com\/?p=210"},"modified":"2022-03-23T15:28:14","modified_gmt":"2022-03-23T07:28:14","slug":"chrome-%e6%9e%b6%e6%9e%84%e8%ae%be%e8%ae%a1","status":"publish","type":"post","link":"https:\/\/wite.oxoooo.com\/?p=210","title":{"rendered":"Chrome \u67b6\u6784\u8bbe\u8ba1"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">CPU \u4e0e GPU<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CPU \u548c GPU \u4f5c\u4e3a\u8ba1\u7b97\u673a\u4e2d\u6700\u91cd\u8981\u7684\u4e24\u4e2a\u8ba1\u7b97\u5355\u5143\u76f4\u63a5\u51b3\u5b9a\u4e86\u8ba1\u7b97\u6027\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/94\/9407812940681a84a4b4661b551da819.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">CPU \u662f\u8ba1\u7b97\u673a\u7684\u5927\u8111\uff0c\u8d1f\u8d23\u5904\u7406\u5404\u79cd\u4e0d\u540c\u7684\u4efb\u52a1\u3002\u5728\u8fc7\u53bb\uff0c\u5927\u591a\u6570 CPU \u662f\u5355\u82af\u7247\u7684\uff0c\u6838\u5fc3\u88ab\u5b89\u7f6e\u5728\u540c\u4e00\u4e2a\u82af\u7247\u4e0a\u3002\u66f4\u65b0\u7684 CPU \u53ef\u4ee5\u652f\u6301\u591a\u6838\u5fc3\uff0c\u8fd0\u7b97\u80fd\u529b\u5927\u5927\u52a0\u5f3a\u3002\u800c\u6700\u65b0\u7684\u7684 cpu \u5df2\u7ecf\u8fbe\u5230 10 \u6838\u5fc3 20 \u7ebf\u7a0b\u6570\u7684\u80fd\u529b\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/8f\/8fc555c4a70f7f844dbb34edec74cf1f.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">GPU \u662f\u53e6\u4e00\u4e2a\u8ba1\u7b97\u673a\u7684\u7ec4\u6210\u90e8\u5206\uff0c\u4e0e CPU \u4e0d\u540c\uff0cGPU 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src=\"https:\/\/static001.geekbang.org\/infoq\/2a\/2af38ddf296b92cd6bbbf97322774c33.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u53ef\u4ee5\u628a\u8ba1\u7b97\u673a\u81ea\u4e0b\u800c\u4e0a\u5206\u6210\u4e09\u5c42\uff1a\u786c\u4ef6\u3001\u64cd\u4f5c\u7cfb\u7edf\u548c\u5e94\u7528\u3002\u6709\u4e86\u64cd\u4f5c\u7cfb\u7edf\u7684\u5b58\u5728\uff0c\u4e0a\u5c42\u8fd0\u884c\u7684\u5e94\u7528\u53ef\u4ee5\u4f7f\u7528\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u80fd\u529b\u4f7f\u7528\u786c\u4ef6\u8d44\u6e90\u800c\u4e0d\u4f1a\u76f4\u63a5\u8bbf\u95ee\u786c\u4ef6\u8d44\u6e90\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fdb\u7a0b\u4e0e\u7ebf\u7a0b<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/97\/97afac83d32e43397ea484653bb6b1ec.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u8fdb\u7a0b\u662f\u5e94\u7528\u6b63\u5728\u8fd0\u884c\u7684\u7a0b\u5e8f\u3002\u800c\u7ebf\u7a0b\u662f\u8fdb\u7a0b\u4e2d\u66f4\u5c0f\u7684\u4e00\u90e8\u5206\u3002\u5f53\u5e94\u7528\u88ab\u542f\u52a8\uff0c\u8fdb\u7a0b\u5c31\u88ab\u521b\u5efa\u51fa\u6765\u3002\u7a0b\u5e8f\u53ef\u4ee5\u521b\u5efa\u7ebf\u7a0b\u6765\u5e2e\u52a9\u5176\u5de5\u4f5c\u3002\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u4e3a\u8fdb\u7a0b\u5206\u914d\u79c1\u6709\u7684\u5185\u5b58\u7a7a\u95f4\u4ee5\u4f9b\u4f7f\u7528\uff0c\u5f53\u5173\u95ed\u7a0b\u5e8f\u65f6\uff0c\u8fd9\u6bb5\u79c1\u6709\u7684\u5185\u5b58\u4e5f\u4f1a\u88ab\u91ca\u653e\u3002\u5176\u5b9e\u8fd8\u6709\u6bd4\u7ebf\u7a0b\u66f4\u5c0f\u7684\u5b58\u5728\u5c31\u662f<strong>\u534f\u7a0b\uff0c\u800c\u534f\u6210\u662f\u8fd0\u884c\u5728\u7ebf\u7a0b\u4e2d\u66f4\u5c0f\u7684\u5355\u4f4d\u3002async\/await \u5c31\u662f\u57fa\u4e8e\u534f\u7a0b\u5b9e\u73b0\u7684\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fdb\u7a0b\u95f4\u901a\u4fe1\uff08IPC\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/b8\/b8306ca61a00c7ccfa68476e61a0b105.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u8ba9\u64cd\u4f5c\u7cfb\u7edf\u5f00\u542f\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u5904\u7406\u4e0d\u540c\u7684\u4efb\u52a1\u3002\u5f53\u4e24\u4e2a\u8fdb\u7a0b\u9700\u8981\u901a\u4fe1\u65f6\uff0c\u53ef\u4ee5\u65f6\u7528 IPC(Inter Process Communication)\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u591a\u6570\u7a0b\u5e8f\u88ab\u8bbe\u8ba1\u6210\u4f7f\u7528 IPC \u6765\u8fdb\u884c\u8fdb\u7a0b\u95f4\u7684\u901a\u4fe1\uff0c\u597d\u5904\u5728\u4e8e\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u7ed9\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u53d1\u6d88\u606f\u800c\u6ca1\u6709\u56de\u5e94\u65f6\uff0c\u5e76\u4e0d\u5f71\u54cd\u5f53\u524d\u7684\u8fdb\u7a0b\u7ee7\u7eed\u5de5\u4f5c\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u6d4f\u89c8\u5668\u67b6\u6784<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u501f\u52a9\u8fdb\u7a0b\u548c\u7ebf\u7a0b\uff0c\u6d4f\u89c8\u5668\u53ef\u4ee5\u88ab\u8bbe\u8ba1\u6210\u5355\u8fdb\u7a0b\u3001\u591a\u7ebf\u7a0b\u67b6\u6784\uff0c\u6216\u8005\u5229\u7528 IPC \u5b9e\u73b0\u591a\u8fdb\u7a0b\u3001\u591a\u7ebf\u7a0b\u67b6\u6784\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"865\" height=\"259\" src=\"https:\/\/www.hgostand.com\/wp-content\/uploads\/2022\/03\/image.png\" alt=\"\" class=\"wp-image-211\" srcset=\"https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/03\/image.png 865w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/03\/image-300x90.png 300w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/03\/image-768x230.png 768w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/03\/image-535x160.png 535w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/03\/image-500x150.png 500w\" sizes=\"(max-width: 865px) 100vw, 865px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u6211\u4eec\u4ee5 Chrome \u591a\u8fdb\u7a0b\u67b6\u6784\u4ecb\u7ecd\uff0c\u5728 Chrome \u4e2d\u5b58\u5728\u8fd9\u4e0d\u540c\u79cd\u7c7b\u578b\u7684\u8fdb\u7a0b\uff0c\u5b83\u4eec\u5404\u53f8\u5176\u804c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/89\/898bb4e5c529e5d3280b6787a7d261a3.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d4f\u89c8\u5668\u8fdb\u7a0b\u505a\u4e3a Chrome \u4e2d\u6700\u6838\u5fc3\u7684\u8fdb\u7a0b\u7ba1\u7406\u7740 Chrome \u4e2d\u7684\u5176\u4ed6\u8fdb\u7a0b\uff0c\u800c Renderer \u5219\u8d1f\u8d23\u6e32\u67d3\u4e0d\u540c\u7684\u7ad9\u70b9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fdb\u7a0b\u5de5\u4f5c\u5185\u5bb9<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/7b\/7bc84e5abe039f836a0af8002d4a63fd.png\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u6d4f\u89c8\u5668\u8fdb\u7a0b\uff08Browser process\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d4f\u89c8\u5668\u8fdb\u7a0b\u8d1f\u8d23\u7ba1\u7406 Chrome \u5e94\u7528\u672c\u8eab\uff0c\u5305\u62ec\u5730\u5740\u680f\u3001\u4e66\u7b7e\u3001\u524d\u8fdb\u548c\u540e\u9000\u6309\u94ae\u3002\u540c\u65f6\u4e5f\u8d1f\u8d23\u53ef\u4e0d\u89c1\u7684\u529f\u80fd\uff0c\u6bd4\u5982\u7f51\u7edc\u8bf7\u6c42\u3001\u6587\u4ef6\u6309\u8bbf\u95ee\u7b49\uff0c\u4e5f\u8d1f\u8d23\u5176\u4ed6\u8fdb\u7a0b\u7684\u8c03\u5ea6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6e32\u67d3\u8fdb\u7a0b\uff08Renderer process\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e32\u67d3\u8fdb\u7a0b\u8d1f\u8d23\u7ad9\u70b9\u7684\u6e32\u67d3\uff0c\u5176\u4e2d\u4e5f\u5305\u62ec JavaScript \u4ee3\u7801\u7684\u8fd0\u884c\uff0cweb worker \u7684\u7ba1\u7406\u7b49\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u63d2\u4ef6\u8fdb\u7a0b\uff08Plugin process\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u63d2\u4ef6\u8fdb\u7a0b\u8d1f\u8d23\u4e3a\u6d4f\u89c8\u5668\u63d0\u4f9b\u5404\u79cd\u989d\u5916\u7684\u63d2\u4ef6\u529f\u80fd\uff0c\u4f8b\u5982 flash\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">GPU \u8fdb\u7a0b\uff08GPU process\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">GPU \u8fdb\u7a0b\u8d1f\u8d23\u63d0\u4f9b\u6210\u50cf\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7136\u8fd8\u6709\u5176\u4ed6\u50cf\u6269\u5c55\u8fdb\u7a0b\u6216\u5de5\u5177\u8fdb\u7a0b\u7b49\u5176\u4ed6\u8fdb\u7a0b\uff0c\u53ef\u4ee5\u5728 Chrome \u7684 Task Manager 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class=\"wp-block-paragraph\">\u53e6\u4e00\u4e2a\u597d\u5904\u662f\uff0c\u501f\u52a9\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u8fdb\u7a0b\u5b89\u5168\u7684\u63a7\u5236\uff0c\u6d4f\u89c8\u5668\u53ef\u4ee5\u5c06\u9875\u9762\u653e\u7f6e\u5728\u6c99\u7bb1\u4e2d\uff0c\u7ad9\u70b9\u7684\u4ee3\u7801\u53ef\u4ee5\u8fd0\u884c\u5728\u9694\u79bb\u7684\u73af\u5883\u4e2d\uff0c\u4fdd\u8bc1\u6838\u5fc3\u8fdb\u7a0b\u7684\u5b89\u5168\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u867d\u7136\u591a\u8fdb\u7a0b\u7684\u67b6\u6784\u4f18\u4e8e\u5355\u8fdb\u7a0b\u67b6\u6784\uff0c\u4f46\u7531\u4e8e\u8fdb\u7a0b\u72ec\u4eab\u81ea\u5df1\u7684\u79c1\u6709\u5185\u5b58\uff0c\u4ee5\u6e32\u67d3\u8fdb\u7a0b\u4e3a\u4f8b\uff0c\u867d\u7136\u6e32\u67d3\u7684\u7ad9\u70b9\u4e0d\u540c\uff0c\u4f46\u5de5\u4f5c\u5185\u5bb9\u5927\u4f53\u76f8\u4f3c\uff0c\u4e3a\u4e86\u5b8c\u6210\u6e32\u67d3\u5de5\u4f5c\u5b83\u4eec\u4f1a\u5728\u81ea\u5df1\u7684\u5185\u5b58\u4e2d\u5305\u542b\u76f8\u540c\u7684\u529f\u80fd\uff0c\u4f8b\u5982 V8 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class=\"wp-block-paragraph\">\u57fa\u4e8e\u7ad9\u70b9\u9694\u79bb\u7684\u6e32\u67d3\u8fdb\u7a0b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5229\u7528 iframe \u6211\u4eec\u53ef\u4ee5\u5728\u540c\u4e00\u4e2a\u9875\u9762\u8bbf\u95ee\u4e0d\u540c\u7ad9\u70b9\u7684\u8d44\u6e90\uff0c\u4f46\u4ece\u5b89\u5168\u7684\u89d2\u5ea6\u8003\u8651\uff0c\u540c\u6e90\u7b56\u7565\u4e0d\u5141\u8bb8\u4e00\u4e2a\u7ad9\u70b9\u5728\u672a\u5f97\u5230\u540c\u610f\u7684\u60c5\u51b5\u4e0b\u8bbf\u95ee\u5176\u4ed6\u7ad9\u70b9\u7684\u8d44\u6e90\uff0c\u6240\u4ee5\u4ece Chrome 67 \u5f00\u59cb\u6bcf\u4e2a\u7ad9\u70b9\u7531\u72ec\u7acb\u7684\u6e32\u67d3\u8fdb\u7a0b\u5904\u7406\u88ab\u9ed8\u8ba4\u542f\u7528\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/fa\/fa70a857e645bec8876257580a935282.png\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d4f\u89c8\u5668\u8fdb\u7a0b<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img 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class=\"wp-block-paragraph\">\u5f53\u6240\u6709\u7684\u68c0\u67e5\u7ed3\u675f\u540e\uff0c\u7f51\u7edc\u7ebf\u7a0b\u786e\u4fe1\u6d4f\u89c8\u5668\u53ef\u4ee5\u8bbf\u95ee\u7ad9\u70b9\u65f6\uff0c\u7f51\u7edc\u7ebf\u7a0b\u901a\u77e5 UI \u7ebf\u7a0b\u6570\u636e\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\u3002UI \u7ebf\u7a0b\u4f1a\u6839\u636e\u5f53\u524d\u7684\u7ad9\u70b9\u627e\u5230\u4e00\u4e2a\u6e32\u67d3\u8fdb\u7a0b\u5b8c\u6210\u63a5\u4e0b\u6765\u7684\u6e32\u67d3\u5de5\u4f5c\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/32\/320ebdce97d9fb29329fd47c0c5f0c07.png\">findrenderer.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u7b2c\u4e8c\u6b65\uff0cUI \u7ebf\u7a0b\u5c06\u8bf7\u6c42\u5730\u5740\u4f20\u9012\u7ed9\u7f51\u7edc\u7ebf\u7a0b\u65f6\uff0cUI \u7ebf\u7a0b\u5c31\u5df2\u7ecf\u77e5\u9053\u4e86\u8981\u8bbf\u95ee\u7684\u7ad9\u70b9\u3002\u6b64\u65f6 UI 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class=\"wp-block-heading\">\u7b2c\u56db\u6b65\uff1a\u63d0\u4ea4\u8bbf\u95ee<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ecf\u5386\u524d\u9762\u7684\u6b65\u9aa4\uff0c\u6570\u636e\u548c\u6e32\u67d3\u8fdb\u7a0b\u90fd\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\u3002\u6d4f\u89c8\u5668\u8fdb\u7a0b\u4f1a\u901a\u8fc7 IPC \u5411\u6e32\u67d3\u8fdb\u7a0b\u63d0\u4ea4\u8fd9\u6b21\u8bbf\u95ee\uff0c\u540c\u65f6\u4e5f\u4f1a\u4fdd\u8bc1\u6e32\u67d3\u8fdb\u7a0b\u53ef\u4ee5\u901a\u8fc7\u7f51\u7edc\u7ebf\u7a0b\u7ee7\u7eed\u83b7\u53d6\u6570\u636e\u3002\u4e00\u65e6\u6d4f\u89c8\u5668\u8fdb\u7a0b\u6536\u5230\u6765\u81ea\u6e32\u67d3\u8fdb\u7a0b\u7684\u786e\u8ba4\u5b8c\u6bd5\u7684\u6d88\u606f\uff0c\u5c31\u610f\u5473\u7740\u8bbf\u95ee\u7684\u8fc7\u7a0b\u7ed3\u675f\u4e86\uff0c\u6587\u6863\u6e32\u67d3\u7684\u8fc7\u7a0b\u5c31\u5f00\u59cb\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u65f6\uff0c\u5730\u5740\u680f\u663e\u793a\u51fa\u8868\u660e\u5b89\u5168\u7684\u56fe\u6807\uff0c\u540c\u65f6\u663e\u793a\u51fa\u7ad9\u70b9\u7684\u4fe1\u606f\u3002\u8bbf\u95ee\u5386\u53f2\u4e2d\u4e5f\u4f1a\u52a0\u5165\u5f53\u524d\u7684\u7ad9\u70b9\u4fe1\u606f\u3002\u4e3a\u4e86\u80fd\u6062\u590d\u8bbf\u95ee\u5386\u53f2\u4fe1\u606f\uff0c\u5f53\u9875\u7b7e\u6216\u7a97\u53e3\u88ab\u5173\u95ed\u65f6\uff0c\u8bbf\u95ee\u5386\u53f2\u7684\u4fe1\u606f\u4f1a\u88ab\u5b58\u50a8\u5728\u786c\u76d8\u4e2d\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/b9\/b9882cfdfbc700b2698116669bf40d4e.png\">commit.png<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Extra Step\uff1a\u52a0\u8f7d\u5b8c\u6bd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u8bbf\u95ee\u88ab\u63d0\u4ea4\u7ed9\u6e32\u67d3\u8fdb\u7a0b\uff0c\u6e32\u67d3\u8fdb\u7a0b\u4f1a\u7ee7\u7eed\u52a0\u8f7d\u9875\u9762\u8d44\u6e90\u5e76\u4e14\u6e32\u67d3\u9875\u9762\u3002\u5f53\u6e32\u67d3\u8fdb\u7a0b&#8221;\u7ed3\u675f&#8221;\u6e32\u67d3\u5de5\u4f5c\uff0c\u4f1a\u7ed9\u6d4f\u89c8\u5668\u8fdb\u7a0b\u53d1\u9001\u6d88\u606f\uff0c\u8fd9\u4e2a\u6d88\u606f\u4f1a\u5728\u9875\u9762\u4e2d\u6240\u6709\u5b50\u9875\u9762\uff08frame\uff09\u7ed3\u675f\u52a0\u8f7d\u540e\u53d1\u51fa\uff0c\u4e5f\u5c31\u662f onLoad \u4e8b\u4ef6\u89e6\u53d1\u540e\u53d1\u9001\u3002\u5f53\u6536\u5230&#8221;\u7ed3\u675f&#8221;\u6d88\u606f\u540e\uff0cUI \u7ebf\u7a0b\u4f1a\u9690\u85cf\u9875\u7b7e\u6807\u9898\u4e0a\u7684\u52a0\u8f7d\u72b6\u6001\u56fe\u6807\uff0c\u8868\u660e\u9875\u9762\u52a0\u8f7d\u5b8c\u6bd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u8fd9\u91cc&#8221;\u7ed3\u675f&#8221;\u5e76\u4e0d\u610f\u5473\u7740\u6240\u6709\u7684\u52a0\u8f7d\u5de5\u4f5c\u90fd\u7ed3\u675f\u4e86\uff0c\u56e0\u4e3a\u53ef\u80fd\u8fd8\u6709 JavaScript \u5728\u52a0\u8f7d\u989d\u5916\u7684\u8d44\u6e90\u6216\u8005\u6e32\u67d3\u65b0\u7684\u89c6\u56fe\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/b9\/b93f199ad2138be6e445d1ceb4416033.png\">loaded.png<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u8bbf\u95ee\u4e0d\u540c\u7684\u7ad9\u70b9<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u6b21\u666e\u901a\u7684\u8bbf\u95ee\u5230\u6b64\u5c31\u7ed3\u675f\u4e86\u3002\u5f53\u6211\u4eec\u8f93\u5165\u53e6\u5916\u4e00\u4e2a\u5730\u5740\u65f6\uff0c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u4f1a\u91cd\u590d\u4e0a\u9762\u7684\u8fc7\u7a0b\u3002\u4f46\u662f\u5728\u5f00\u59cb\u65b0\u7684\u8bbf\u95ee\u524d\uff0c\u4f1a\u786e\u8ba4\u5f53\u524d\u7684\u7ad9\u70b9\u662f\u5426\u5173\u5fc3<code>beforeunload<\/code>\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>beforeunload<\/code>\u4e8b\u4ef6\u53ef\u4ee5\u63d0\u9192\u7528\u6237\u662f\u5426\u8981\u8bbf\u95ee\u65b0\u7684\u7ad9\u70b9\u6216\u8005\u5173\u95ed\u9875\u7b7e\uff0c\u5982\u679c\u7528\u6237\u62d2\u7edd\u5219\u65b0\u7684\u8bbf\u95ee\u6216\u5173\u95ed\u4f1a\u88ab\u963b\u6b62\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u6240\u6709\u7684\u5305\u62ec\u6e32\u67d3\u3001\u8fd0\u884c Javascript \u7684\u5de5\u4f5c\u90fd\u53d1\u751f\u5728\u6e32\u67d3\u8fdb\u7a0b\u4e2d\uff0c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u9700\u8981\u5728\u65b0\u7684\u8bbf\u95ee\u5f00\u59cb\u524d\u4e0e\u6e32\u67d3\u8fdb\u7a0b\u786e\u8ba4\u5f53\u524d\u7684\u7ad9\u70b9\u662f\u5426\u5173\u5fc3<code>unload<\/code>\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/71\/71402d5b3a3f7d5629a242727e606079.png\">beforeunload.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u6b21\u8bbf\u95ee\u662f\u4ece\u4e00\u4e2a\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u53d1\u8d77\u7684\uff0c\u4f8b\u5982\u7528\u6237\u70b9\u51fb\u4e00\u4e2a\u94fe\u63a5\u6216\u8005\u8fd0\u884c JavaScript \u4ee3\u7801<code>location = 'http:\/\/newsite.com'<\/code>\u65f6\uff0c\u6e32\u67d3\u8fdb\u7a0b\u9996\u5148\u68c0\u67e5<code>beforeunload<\/code>\u3002\u7136\u540e\u518d\u6267\u884c\u548c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u521d\u59cb\u5316\u8bbf\u95ee\u540c\u6837\u7684\u6b65\u9aa4\uff0c\u53ea\u4e0d\u8fc7\u533a\u522b\u5728\u4e8e\u8fd9\u6837\u7684\u8bbf\u95ee\u8bf7\u6c42\u662f\u7531\u6e32\u67d3\u8fdb\u7a0b\u5411\u6d4f\u89c8\u5668\u8fdb\u7a0b\u53d1\u8d77\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u65b0\u7684\u7ad9\u70b9\u8bf7\u6c42\u88ab\u521b\u5efa\u65f6\uff0c\u4e00\u4e2a\u72ec\u7acb\u7684\u6e32\u67d3\u8fdb\u7a0b\u5c06\u88ab\u7528\u4e8e\u5904\u7406\u8fd9\u4e2a\u8bf7\u6c42\u3002\u4e3a\u4e86\u652f\u6301\u50cf<code>unload<\/code>\u7684\u4e8b\u4ef6\u89e6\u53d1\uff0c\u8001\u7684\u6e32\u67d3\u8fdb\u7a0b\u9700\u8981\u4fdd\u6301\u4f4f\u5f53\u524d\u7684\u72b6\u6001\u3002\u66f4\u8be6\u7ec6\u7684\u751f\u547d\u5468\u671f\u4ecb\u7ecd\u53ef\u4ee5\u53c2\u8003<a href=\"https:\/\/developers.google.com\/web\/updates\/2018\/07\/page-lifecycle-api#overview_of_page_lifecycle_states_and_events\">Page lifecycle<\/a>\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/e0\/e074926b6b24cae624f6c1c906c16616.png\">unload.png<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Service worker<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Service worker \u662f\u4e00\u79cd\u53ef\u4ee5 web \u5f00\u53d1\u8005\u63a7\u5236\u7f13\u5b58\u7684\u6280\u672f\u3002\u5982\u679c Service worker \u88ab\u5b9e\u73b0\u6210\u4ece\u672c\u5730\u5b58\u50a8\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u90a3\u4e48\u539f\u672c\u7684\u8bf7\u6c42\u5c31\u4e0d\u4f1a\u88ab\u6d4f\u89c8\u5668\u53d1\u9001\u7ed9\u670d\u52a1\u5668\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cService worker \u4e2d\u7684\u4ee3\u7801\u662f\u8fd0\u884c\u5728\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u7684\u3002\u5f53\u8bbf\u95ee\u5f00\u59cb\u65f6\uff0c\u7f51\u7edc\u7ebf\u7a0b\u4f1a\u6839\u636e\u57df\u540d\u68c0\u67e5\u662f\u5426\u6709 Service worker \u4f1a\u5904\u7406\u5f53\u524d\u5730\u5740\u7684\u8bf7\u6c42\uff0c\u5982\u679c\u6709\uff0c\u5219 UI \u7ebf\u7a0b\u4f1a\u627e\u5230\u5bf9\u5e94\u7684\u6e32\u67d3\u8fdb\u7a0b\u53bb\u6267\u884c Service worker \u7684\u4ee3\u7801\uff0c\u800c Service worker \u53ef\u4ee5\u8ba9\u5f00\u53d1\u8005\u51b3\u5b9a\u8fd9\u4e2a\u8bf7\u6c42\u662f\u4ece\u672c\u5730\u5b58\u50a8\u8fd8\u662f\u4ece\u7f51\u7edc\u4e2d\u83b7\u53d6\u6570\u636e\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/8c\/8c45c55d238b901239d0eb4bd40f2892.png\">scope_lookup.png<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/fd\/fdeaee16c665e81bc59f42122080916f.png\">serviceworker.png<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u8bbf\u95ee\u9884\u52a0\u8f7d<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c Service worker \u6700\u7ec8\u51b3\u5b9a\u8981\u4ece\u7f51\u7edc\u4e2d\u83b7\u53d6\u6570\u636e\u65f6\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u8fd9\u79cd\u8de8\u8fdb\u7a0b\u7684\u901a\u4fe1\u4f1a\u9020\u6210\u4e00\u4e9b\u5ef6\u8fdf\u3002<a href=\"https:\/\/developers.google.com\/web\/updates\/2017\/02\/navigation-preload\">Navigation Preload<\/a>\u662f\u4e00\u79cd\u53ef\u4ee5\u5728 Service worker \u542f\u52a8\u7684\u540c\u65f6\u52a0\u8f7d\u8d44\u6e90\u7684\u4f18\u5316\u673a\u5236\u3002\u501f\u52a9\u7279\u6b8a\u7684\u8bf7\u6c42\u5934\uff0c\u670d\u52a1\u5668\u53ef\u4ee5\u51b3\u5b9a\u8fd4\u56de\u4ec0\u4e48\u6837\u7684\u5185\u5bb9\u7ed9\u6d4f\u89c8\u5668\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/21\/212631fa2520d730f17b0461ddae71d6.png\">navpreload.png<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6e32\u67d3\u8fdb\u7a0b\u8d1f\u8d23\u9875\u9762\u7684\u5185\u5bb9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e32\u67d3\u8fdb\u7a0b\u8d1f\u8d23\u6240\u6709\u53d1\u751f\u5728\u6d4f\u89c8\u5668\u9875\u7b7e\u4e2d\u7684\u4e8b\u60c5\u3002\u5728\u4e00\u4e2a\u6e32\u67d3\u8fdb\u7a0b\u4e2d\uff0c\u4e3b\u7ebf\u7a0b\u8d1f\u8d23\u89e3\u6790\uff0c\u7f16\u8bd1\u6216\u8fd0\u884c\u4ee3\u7801\u7b49\u5de5\u4f5c\uff0c\u5f53\u6211\u4eec\u4f7f\u7528 Worker \u65f6\uff0cWorker \u7ebf\u7a0b\u4f1a\u8d1f\u8d23\u8fd0\u884c\u4e00\u90e8\u5206\u4ee3\u7801\u3002\u5408\u6210\u7ebf\u7a0b\u548c\u5149\u6805\u7ebf\u7a0b\u662f\u4e5f\u662f\u8fd0\u884c\u5728\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u7684\uff0c\u8d1f\u8d23\u66f4\u9ad8\u6548\u548c\u987a\u7545\u7684\u6e32\u67d3\u9875\u9762\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e32\u67d3\u8fdb\u7a0b\u6700\u91cd\u8981\u7684\u5de5\u4f5c\u5c31\u662f\u5c06 HTML\u3001CSS \u548c Javascript \u4ee3\u7801\u8f6c\u6362\u6210\u4e00\u4e2a\u53ef\u4ee5\u4e0e\u7528\u6237\u4ea7\u751f\u4ea4\u4e92\u7684\u9875\u9762\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/bd\/bdfa66a4ef1fbd2805797bc4cd90f8d8.png\">renderer.png<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u89e3\u6790\u8fc7\u7a0b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u7684\u7ae0\u8282\u4e3b\u8981\u4ecb\u7ecd\u6e32\u67d3\u8fdb\u7a0b\u5982\u4f55\u5c06\u4ece\u7f51\u7edc\u7ebf\u7a0b\u4e2d\u83b7\u53d6\u7684\u6587\u672c\u8f6c\u5316\u6210\u56fe\u50cf\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DOM \u7684\u521b\u5efa<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u6e32\u67d3\u8fdb\u7a0b\u63a5\u6536\u5230\u6765\u81ea\u6d4f\u89c8\u5668\u8fdb\u7a0b\u63d0\u4ea4\u8bbf\u95ee\u7684\u6d88\u606f\u540e\u5c31\u5f00\u59cb\u63a5\u53d7 HTML \u6570\u636e\uff0c\u4e3b\u7ebf\u7a0b\u5f00\u59cb\u89e3\u6790 HTML \u6587\u672c\u5b57\u7b26\u4e32\uff0c\u5e76\u4e14\u5c06\u5176\u8f6c\u5316\u6210 <strong>Document Object Model\uff08DOM\uff09<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DOM \u662f\u4e00\u79cd\u6d4f\u89c8\u5668\u5185\u90e8\u7528\u4e8e\u8868\u8fbe\u9875\u9762\u7ed3\u6784\u7684\u6570\u636e\uff0c\u540c\u65f6\u4e5f\u4e3a Web \u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u64cd\u4f5c\u9875\u9762\u5143\u7d20\u7684\u63a5\u53e3\uff0c\u8ba9 web \u5f00\u53d1\u8005\u53ef\u4ee5\u5728 Javascript \u4ee3\u7801\u4e2d\u83b7\u53d6\u548c\u64cd\u4f5c\u9875\u9762\u4e2d\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06 HTML \u6587\u672c\u8f6c\u5316\u6210 DOM \u7684\u6807\u51c6\u88ab<a href=\"https:\/\/html.spec.whatwg.org\/\">HTML Standard<\/a>\u5b9a\u4e49\u3002\u6211\u4eec\u4f1a\u53d1\u73b0\u5728\u8f6c\u5316\u8fc7\u7a0b\u4e2d\u6d4f\u89c8\u5668\u4ece\u6765\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u7c7b\u4f3c\u5173\u95ed\u6807\u7b7e\u7684\u4e22\u5931\uff0c\u5f00\u59cb\u3001\u5173\u95ed\u6807\u7b7e\u5339\u914d\u9519\u8bef\u7b49\u7b49\u3002\u8fd9\u662f\u56e0\u4e3a HTML \u6807\u51c6\u4e2d\u5b9a\u4e49\u4e86\u8981\u9759\u9ed8\u7684\u5904\u7406\u8fd9\u4e9b\u9519\u8bef\uff0c\u5982\u679c\u5bf9\u6b64\u611f\u5174\u8da3\u53ef\u4ee5\u9605\u8bfb<a href=\"https:\/\/html.spec.whatwg.org\/multipage\/parsing.html#an-introduction-to-error-handling-and-strange-cases-in-the-parser\">An introduction to error handling and strange cases in the parser<\/a>\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u989d\u5916\u8d44\u6e90\u7684\u52a0\u8f7d<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u7f51\u7ad9\u901a\u5e38\u8fd8\u4f1a\u4f7f\u7528\u7c7b\u4f3c\u56fe\u7247\uff0c\u6837\u5f0f\u6587\u4ef6\u548c JavaScript \u4ee3\u7801\u7b49\u989d\u5916\u7684\u8d44\u6e90\u3002\u8fd9\u4e9b\u8d44\u6e90\u4e5f\u9700\u8981\u4ece\u7f51\u7edc\u6216\u7f13\u5b58\u4e2d\u83b7\u53d6\u3002\u4e3b\u7ebf\u7a0b\u5728\u8f6c\u5316 HTML \u7684\u8fc7\u7a0b\u4e2d\u7406\u5e94\u6328\u4e2a\u52a0\u8f7d\u5b83\u4eec\uff0c\u4f46\u662f\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387\uff0c\u9884\u52a0\u8f7d\u626b\u63cf\uff08Preload Scanner\uff09\u4e0e\u8f6c\u6362\u8fc7\u7a0b\u4f1a\u540c\u65f6\u8fd0\u884c\u7740\u3002\u5f53\u9884\u52a0\u8f7d\u626b\u63cf\u5728\u5206\u6790\u5668\u5206\u6790 HTML \u8fc7\u7a0b\u4e2d\u53d1\u73b0\u4e86\u7c7b\u4f3c img \u6216 link \u8fd9\u6837\u7684\u6807\u7b7e\u65f6\uff0c\u5c31\u4f1a\u53d1\u9001\u8bf7\u6c42\u7ed9\u6d4f\u89c8\u5668\u8fdb\u7a0b\u7684\u7f51\u7edc\u7ebf\u7a0b\uff0c\u800c\u4e3b\u7ebf\u7a0b\u4f1a\u6839\u636e\u8fd9\u4e9b\u989d\u5916\u8d44\u6e90\u662f\u5426\u4f1a\u963b\u585e\u8f6c\u5316\u8fc7\u7a0b\u800c\u51b3\u5b9a\u662f\u5426\u7b49\u5f85\u8d44\u6e90\u52a0\u8f7d\u5b8c\u6bd5\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/fa\/fa689d6a31b8687522c58774c8d9d064.png\">dom.png<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">JavaScript \u4f1a\u963b\u585e\u8f6c\u5316\u8fc7\u7a0b<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 HTML \u5206\u6790\u5668\u53d1\u73b0<code>&lt;script&gt;<\/code>\u6807\u7b7e\u65f6\uff0c\u4f1a\u6682\u505c\u63a5\u4e0b\u6765\u7684 HTML \u8f6c\u5316\u5de5\u4f5c\uff0c\u7136\u540e\u52a0\u8f7d\u3001\u89e3\u6790\u5e76\u4e14\u8fd0\u884c Javascript \u4ee3\u7801\u3002\u56e0\u4e3a\u5728 Javascript \u4ee3\u7801\u4e2d\u53ef\u80fd\u4f1a\u4f7f\u7528\u7c7b\u4f3c<code>document.write<\/code>\u8fd9\u6837\u7684 API \u53bb\u6539\u53d8 DOM \u7684\u7ed3\u6784\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48 HTML \u5206\u6790\u5668\u5fc5\u987b\u7b49\u5f85 Javascript \u4ee3\u7801\u8fd0\u884c\u7ed3\u675f\u624d\u80fd\u7ee7\u7eed\u5206\u6790\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u544a\u8bc9\u6d4f\u89c8\u5668\u8981\u5982\u4f55\u52a0\u8f7d\u8d44\u6e90<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6211\u4eec\u7684 Javascript \u4ee3\u7801\u5e76\u4e0d\u9700\u8981\u6539\u53d8 DOM\uff0c\u53ef\u4ee5\u4e3a<code>&lt;script&gt;<\/code>\u6807\u7b7e\u6dfb\u52a0<code>async<\/code>\u6216<code>defer<\/code>\u5c5e\u6027\uff0c\u8fd9\u6837\u6d4f\u89c8\u5668\u5c31\u4f1a\u5f02\u6b65\u7684\u52a0\u8f7d\u8fd9\u4e9b\u8d44\u6e90\u5e76\u4e14\u4e0d\u4f1a\u963b\u585e HTML \u8f6c\u5316\u8fc7\u7a0b\u3002<strong>\u5982\u679c script \u6807\u7b7e\u662f\u7531 JavaScript \u4ee3\u7801\u521b\u5efa\u7684\uff0c\u6807\u7b7e\u7684 async \u5c5e\u6027\u4f1a\u9ed8\u8ba4\u4e3a true\u3002<\/strong>\u540c\u65f6\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u9884\u52a0\u8f7d\u6280\u672f\uff0c\u6bd4\u5982<code>&lt;link ref=\"preload\"&gt;<\/code>\u6765\u901a\u77e5\u6d4f\u89c8\u5668\u8fd9\u4e9b\u8d44\u6e90\u9700\u8981\u8d8a\u5feb\u4e0b\u8f7d\u8d8a\u597d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6837\u5f0f\u8ba1\u7b97\uff08Style calculation\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u5c55\u793a\u4e00\u4e2a\u9875\u9762\uff0c\u5149\u6709 DOM \u662f\u4e0d\u591f\u7684\uff0c\u56e0\u4e3a\u6211\u4eec\u8fd8\u9700\u8981\u6837\u5f0f\u6765\u8ba9\u9875\u9762\u53d8\u5f97\u66f4\u7f8e\u89c2\u3002\u4e3b\u7ebf\u7a0b\u4f1a\u89e3\u6790\u6837\u5f0f\uff08CSS\uff09\u5e76\u51b3\u5b9a\u6bcf\u4e2a DOM \u5143\u7d20\u7684\u6837\u5f0f\u3002\u8fd9\u4e9b\u6837\u5f0f\u53d6\u51b3\u4e8e CSS \u9009\u62e9\u5668\u7684\u8303\u56f4\uff0c\u5728\u6d4f\u89c8\u5668\u5f00\u53d1\u8005\u5de5\u5177\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e9b\u4fe1\u606f\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/fb\/fb7d195814a04c6ed98eab8dbda477c6.png\">computedstyle.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5373\u4f7f\u6211\u4eec\u6ca1\u6709\u7ed9 DOM \u6307\u5b9a\u4efb\u4f55\u7684\u6837\u5f0f\uff0c<code>&lt;h1&gt;<\/code>\u6807\u7b7e\u4e5f\u4f1a\u6bd4<code>&lt;h2&gt;<\/code>\u6807\u7b7e\u663e\u793a\u7684\u5927\u3002\u8fd9\u662f\u56e0\u4e3a\u6d4f\u89c8\u5668\u4e3a\u4e0d\u540c\u7684\u6807\u7b7e\u5185\u7f6e\u4e86\u4e0d\u540c\u7684\u6837\u5f0f\u3002\u53ef\u4ee5\u901a\u8fc7<a href=\"https:\/\/source.chromium.org\/chromium\/chromium\/src\/+\/master:third_party\/blink\/renderer\/core\/html\/resources\/html.css\">Chromium\u6e90\u4ee3\u7801<\/a>\u5f97\u5230\u8fd9\u4e9b\u9ed8\u8ba4\u6837\u5f0f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5e03\u5c40\uff08layout\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b8c\u6210\u4e86\u6837\u5f0f\u8ba1\u7b97\u5de5\u4f5c\u540e\uff0c\u6e32\u67d3\u8fdb\u7a0b\u5df2\u7ecf\u77e5\u9053\u4e86 DOM \u7684\u7ed3\u6784\u548c\u6bcf\u4e2a\u8282\u70b9\u7684\u6837\u5f0f\uff0c\u4f46\u662f\u4f9d\u7136\u4e0d\u8db3\u4ee5\u6e32\u67d3\u4e00\u4e2a\u9875\u9762\u3002\u60f3\u8c61\u4e00\u4e0b\uff0c\u8ba9\u4f60\u5728\u7535\u8bdd\u4e2d\u5411\u670b\u53cb\u63cf\u8ff0\u4e00\u5f20\u56fe\uff1a\u201c\u56fe\u4e2d\u6709\u4e00\u4e2a\u5927\u7ea2\u8272\u5706\u548c\u4e00\u4e2a\u5c0f\u7684\u3001\u84dd\u8272\u7684\u65b9\u5757\u201d\u662f\u4e0d\u8db3\u4ee5\u8ba9\u670b\u53cb\u77e5\u9053\u8fd9\u5f20\u56fe\u5230\u5e95\u662f\u4ec0\u4e48\u6837\u7684\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/06\/0658494542e14f7db66b913c02c03202.png\">tellgame.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e03\u5c40\u662f\u4e3a\u5143\u7d20\u6307\u5b9a\u51e0\u4f55\u4fe1\u606f\u7684\u8fc7\u7a0b\u3002\u4e3b\u7ebf\u7a0b\u904d\u5386 DOM \u7ed3\u6784\u4e2d\u7684\u5143\u7d20\u53ca\u5176\u6837\u5f0f\uff0c\u540c\u65f6\u521b\u5efa\u51fa\u5e26\u6709\u5750\u6807\u548c\u5143\u7d20\u5c3a\u5bf8\u4fe1\u606f\u7684\u5e03\u5c40\u6811\uff08Layout tree\uff09\u3002\u5e03\u5c40\u6811\u7684\u7ed3\u6784\u4e0e DOM \u6811\u7684\u7ed3\u6784\u5341\u5206\u76f8\u4f3c\uff0c\u4f46\u53ea\u5305\u542b\u5c06\u4f1a\u5728\u9875\u9762\u4e2d\u663e\u793a\u7684\u5143\u7d20\u3002<strong>\u5f53\u4e00\u4e2a\u5143\u7d20\u7684\u6837\u5f0f\u88ab\u8bbe\u7f6e\u6210 display: none \u65f6\uff0c\u5143\u7d20\u5c31\u4e0d\u4f1a\u51fa\u73b0\u5728\u5e03\u5c40\u6811\u4e2d\uff0c\u4f46\u90a3\u4e9b\u6837\u5f0f\u88ab\u8bbe\u7f6e\u6210 visiblility\uff1ahidden \u7684\u5143\u7d20\u4f1a\u51fa\u73b0\u5728\u5e03\u5c40\u6811\u4e2d\u3002<\/strong>\u76f8\u4f3c\u7684\uff0c\u5f53\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u5305\u542b\u5185\u5bb9\u7684\u4f2a\u5143\u7d20\uff08\u4f8b\u5982<code>p::before { content: 'Hi!' }<\/code>\uff09\u65f6\uff0c\u5143\u7d20\u4f1a\u51fa\u73b0\u5728\u5e03\u5c40\u6811\u4e2d\u5373\u4f7f\u8fd9\u4e2a\u5143\u7d20\u4e0d\u5b58\u5728\u4e8e DOM \u6811\u4e2d\uff0c\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec<strong>\u4f7f\u7528 DOM \u63d0\u4f9b\u7684 API \u65e0\u6cd5\u83b7\u53d6\u4f2a\u5143\u7d20<\/strong>\u7684\u539f\u56e0\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/0c\/0c1de85206f0d177f93a70931a0f8272.png\">layout.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63cf\u8ff0\u9875\u9762\u5e03\u5c40\u4fe1\u606f\u662f\u4e00\u9879\u5177\u6709\u6311\u6218\u6027\u7684\u5de5\u4f5c\uff0c\u5373\u4f7f\u5728\u53ea\u6709\u5757\u5143\u7d20\u7684\u9875\u9762\u4e2d\u4e5f\u5fc5\u987b\u8981\u8003\u8651\u5b57\u4f53\u7684\u5927\u5c0f\u548c\u5728\u54ea\u91cc\u6362\u884c\uff0c\u56e0\u4e3a\u5728\u8ba1\u7b97\u4e0b\u4e00\u4e2a\u5143\u7d20\u7684\u4f4d\u7f6e\u65f6\u9700\u8981\u77e5\u9053\u4e0a\u4e00\u4e2a\u5143\u7d20\u7684\u5c3a\u5bf8\u548c\u5f62\u72b6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CSS \u53ef\u4ee5\u8ba9\u5143\u7d20\u6d6e\u52a8\u3001\u53ef\u4ee5\u8ba9\u5143\u7d20\u5728\u7236\u5143\u7d20\u4e2d\u6ea2\u51fa\uff0c\u53ef\u4ee5\u6539\u53d8\u6587\u5b57\u7684\u65b9\u5411\u3002\u53ef\u4ee5\u60f3\u8c61\uff0c\u5728\u5e03\u5c40\u8fd9\u4e2a\u9636\u6bb5\u662f\u591a\u4e48\u7e41\u91cd\u7684\u5de5\u4f5c\u3002\u5728 Chrome \u4e2d\uff0c\u6709\u4e00\u6574\u4e2a\u56e2\u961f\u5728\u7ef4\u62a4\u5e03\u5c40\u5de5\u4f5c\uff0c\u66f4\u8be6\u7ec6\u7684\u4fe1\u606f\u53ef\u4ee5\u89c2\u770b<a href=\"https:\/\/www.youtube.com\/watch?v=Y5Xa4H2wtVA\">\u89c6\u9891<\/a>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7ed8\u5236\uff08Paint\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/d8\/d8fe81b968531c8b3d4767006ea9725d.png\">drawgame.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u4e86 DOM\u3001\u6837\u5f0f\u548c\u5e03\u5c40\u8fd8\u662f\u65e0\u6cd5\u5b8c\u6210\u6e32\u67d3\u5de5\u4f5c\u3002\u8bd5\u60f3\uff0c\u5f53\u6211\u4eec\u8bd5\u56fe\u590d\u5236\u4e00\u5f20\u56fe\u753b\u3002\u6211\u4eec\u77e5\u9053\u56fe\u753b\u4e2d\u5143\u7d20\u7684\u5c3a\u5bf8\u3001\u5f62\u72b6\u548c\u4f4d\u7f6e\uff0c\u6211\u4eec\u8fd8\u9700\u8981\u77e5\u9053\u7ed8\u5236\u8fd9\u4e9b\u5143\u7d20\u7684\u987a\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982\uff0c\u5f53\u4e00\u4e2a\u5143\u7d20 z-index \u5c5e\u6027\u88ab\u8bbe\u7f6e\u540e\uff0c\u7ed8\u5236\u7684\u987a\u5e8f\u4f1a\u5bfc\u81f4\u6e32\u67d3\u6210\u9519\u8bef\u7684\u7ed3\u679c\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/11\/116fb1ec64e618a7562788911bca8d75.png\">zindex.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u4e3b\u7ebf\u7a0b\u904d\u5386\u5e03\u5c40\u6811\u5e76\u521b\u5efa\u7ed8\u5236\u8bb0\u5f55\uff0c\u7ed8\u5236\u8bb0\u5f55\u662f\u4e00\u7cfb\u5217\u7531\u7ed8\u5236\u6b65\u9aa4\u7ec4\u6210\u7684\u6d41\u7a0b\uff0c\u4f8b\u5982\u5148\u7ed8\u5236\u80cc\u666f\uff0c\u7136\u540e\u662f\u6587\u5b57\uff0c\u7136\u540e\u662f\u5f62\u72b6\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/a6\/a68fd128fc59b9b2bed3511fcf223c94.png\">paint.png<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6e32\u67d3\u8fc7\u7a0b\u662f\u6602\u8d35\u7684<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u6e32\u67d3\u8fc7\u7a0b\u4e2d\uff0c\u4efb\u4f55\u4e00\u4e2a\u6b65\u9aa4\u4e2d\u4ea7\u751f\u7684\u6570\u636e\u53d8\u5316\u90fd\u4f1a\u5f15\u8d77\u540e\u7eed\u4e00\u7cfb\u5217\u7684\u7684\u53d8\u5316\u3002\u4f8b\u5982\uff0c\u5f53\u5e03\u5c40\u6811\u6539\u53d8\u65f6\uff0c\u7ed8\u5236\u9700\u8981\u91cd\u6784\u9875\u9762\u4e2d\u53d8\u5316\u7684\u90e8\u5206\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4e00\u4e9b\u5143\u7d20\u6709\u52a8\u753b\u53d1\u751f\u65f6\uff0c\u6d4f\u89c8\u5668\u9700\u8981\u5728\u6bcf\u4e00\u5e27\u4e2d\u7ed8\u5236\u8fd9\u4e9b\u5143\u7d20\u3002\u5f53\u65e0\u6cd5\u4fdd\u8bc1\u6bcf\u4e00\u5e27\u7ed8\u5236\u7684\u8fde\u7eed\u6027\u65f6\uff0c\u7528\u6237\u5c31\u4f1a\u611f\u89c9\u5230\u5361\u987f\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/54\/54a9da693ebba8579317ff57be2993ea.png\">pagejank1.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u5e38\u60c5\u51b5\u4e0b\u6e32\u67d3\u64cd\u4f5c\u53ef\u4ee5\u4e0e\u5c4f\u5e55\u5237\u65b0\u4fdd\u6301\u540c\u6b65\uff0c\u4f46\u7531\u4e8e\u8fd9\u4e9b\u64cd\u4f5c\u8fd0\u884c\u5728\u4e3b\u7ebf\u7a0b\u4e2d\uff0c\u4e5f\u5c31\u610f\u5473\u8fd9\u4e9b\u64cd\u4f5c\u53ef\u80fd\u88ab\u6b63\u5728\u8fd0\u884c\u7684 Javascript \u4ee3\u7801\u6240\u963b\u585e\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/6b\/6bd8886a8c2b26a72105c7a2fba7bf3a.png\">pagejank2.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u4e0d\u5f71\u54cd\u6e32\u67d3\u64cd\u4f5c\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06 Javascript \u64cd\u4f5c\u4f18\u5316\u6210\u5c0f\u5757\uff0c\u7136\u540e\u4f7f\u7528<code>requestAnimationFrame()<\/code>\uff0c\u5173\u4e8e\u5982\u4f55\u4f18\u5316\u53ef\u4ee5\u53c2\u8003<a href=\"https:\/\/developers.google.com\/web\/fundamentals\/performance\/rendering\/optimize-javascript-execution\">Optimize JavaScript Exectuion<\/a>\u3002\u5f53\u9700\u8981\u5927\u91cf\u8ba1\u7b97\u65f6\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528 Worker \u6765\u907f\u514d\u963b\u585e\u4e3b\u8fdb\u7a0b\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/45\/45d6db6a394174c914eb37e13743f94d.png\">raf.png<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5408\u6210\uff08Compositing\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\uff0c\u6d4f\u89c8\u5668\u5df2\u7ecf\u77e5\u9053\u4e86\u6587\u6863\u7ed3\u6784\u3001\u6bcf\u4e00\u4e2a\u5143\u7d20\u7684\u6837\u5f0f\uff0c\u5143\u7d20\u7684\u51e0\u4f55\u4fe1\u606f\uff0c\u7ed8\u5236\u7684\u987a\u5e8f\u3002\u5c06\u8fd9\u4e9b\u4fe1\u606f\u8f6c\u5316\u6210\u5c4f\u5e55\u4e0a\u50cf\u7d20\u7684\u8fc7\u7a0b\u53eb\u505a\u5149\u6805\u5316\uff0c\u5149\u6805\u5316\u662f\u56fe\u5f62\u5b66\u7684\u8303\u7574\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/9e\/9ed512afc63c664458faf1bd42247cc0.gif\">rasterizing.gif<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f20\u7edf\u7684\u505a\u6cd5\u662f\u5c06\u53ef\u89c6\u533a\u57df\u7684\u5185\u5bb9\u8fdb\u884c\u5149\u6805\u5316\u3002\u968f\u7740\u7528\u6237\u6eda\u52a8\u9875\u9762\uff0c\u4e0d\u65ad\u7684\u5149\u6805\u5316\u66f4\u591a\u7684\u533a\u57df\u3002\u7136\u800c\u5bf9\u4e8e\u73b0\u4ee3\u6d4f\u89c8\u5668\uff0c\u6709\u7740\u66f4\u590d\u6742\u7684\u7684\u8fc7\u7a0b\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u88ab\u79f0\u505a\u5408\u6210\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/ae\/ae1b6d19e8aeb45841f04bbfa72760dd.gif\">composit.gif<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5408\u6210\u662f\u4e00\u79cd\u5c06\u9875\u9762\u62c6\u5206\u6210\u591a\u5c42\u7684\u6280\u672f\uff0c\u5408\u6210\u7ebf\u7a0b\u53ef\u4ee5\u5c06\u5404\u4e2a\u5c42\u5728\u4e0d\u540c\u7ebf\u7a0b\u4e2d\u5149\u6805\u5316\uff0c\u518d\u7ec4\u5408\u6210\u4e00\u4e2a\u9875\u9762\u3002\u5f53\u6eda\u52a8\u65f6\uff0c\u5982\u679c\u5c42\u5df2\u7ecf\u88ab\u5149\u6805\u5316\uff0c\u5219\u4f1a\u4f7f\u7528\u5df2\u7ecf\u5b58\u5728\u7684\u5c42\u5408\u6210\u65b0\u7684\u5e27\uff0c\u52a8\u753b\u5219\u53ef\u4ee5\u901a\u8fc7\u79fb\u52a8\u5c42\u6765\u5b9e\u73b0\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5c42\uff08Layer\uff09<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u51b3\u5b9a\u5c42\u5305\u542b\u54ea\u4e9b\u5143\u7d20\uff0c\u4e3b\u7ebf\u7a0b\u9700\u8981\u904d\u5386\u5e03\u5c40\u6811\u4ee5\u627e\u5230\u9700\u8981\u751f\u6210\u7684\u90e8\u5206\u3002\u5bf9\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u5f53\u67d0\u4e00\u90e8\u5206\u9700\u8981\u7528\u72ec\u7acb\u7684\u5c42\u6e32\u67d3\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 css \u5c5e\u6027<code>will-change<\/code>\u8ba9\u6d4f\u89c8\u5668\u521b\u5efa\u5c42\uff0c\u5173\u4e8e\u6d4f\u89c8\u5668\u5982\u4f55\u751f\u6210\u5c42\u7684\u6807\u51c6\u53ef\u81ea\u884c\u67e5\u9605\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/b0\/b08901dee7af151982f600e6a7a6ba43.png\">layer.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u867d\u7136\u901a\u8fc7\u5206\u5c42\u53ef\u4ee5\u4f18\u5316\u6d4f\u89c8\u5668\u6027\u80fd\uff0c\u4f46\u5e76\u4e0d\u610f\u5473\u7740\u5e94\u8be5\u7ed9\u6bcf\u4e2a\u5143\u7d20\u4e00\u4e2a\u5c42\uff0c\u8fc7\u591a\u7684\u5c42\u53cd\u800c\u5f71\u54cd\u6027\u80fd\uff0c\u6240\u4ee5\u5728\u5c42\u7684\u5212\u5206\u4e0a\u5e94\u8be5\u5177\u4f53\u5f62\u51b5\u5177\u4f53\u5206\u6790\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6805\u683c\u7ebf\u7a0b\u4e0e\u5408\u6210\u7ebf\u7a0b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u5e03\u5c40\u6811\u548c\u7ed8\u5236\u987a\u5e8f\u786e\u5b9a\u4ee5\u540e\uff0c\u4e3b\u7ebf\u7a0b\u4f1a\u5c06\u8fd9\u4e9b\u4fe1\u606f\u63d0\u4ea4\u7ed9\u5408\u6210\u7ebf\u7a0b\u3002\u5408\u6210\u7ebf\u7a0b\u4f1a\u5149\u6805\u5316\u5404\u4e2a\u5c42\u3002\u4e00\u4e2a\u5c42\u5305\u542b\u7684\u5185\u5bb9\u53ef\u80fd\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u9875\u9762\uff0c\u4e5f\u53ef\u80fd\u662f\u9875\u9762\u7684\u90e8\u5206\uff0c\u6240\u4ee5\u5408\u6210\u7ebf\u7a0b\u5c06\u5c42\u62c6\u5206\u6210\u8bb8\u591a\u5757\uff0c\u5e76\u5c06\u5b83\u4eec\u53d1\u9001\u7ed9\u6805\u683c\u7ebf\u7a0b\u3002\u6805\u683c\u7ebf\u7a0b\u5149\u6805\u5316\u8fd9\u4e9b\u5757\u5e76\u5c06\u5b83\u4eec\u5b58\u50a8\u5728 GPU \u7f13\u5b58\u4e2d\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/37\/371b5fa654d59f0c8ccb2f4f0658c20a.png\">raster.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5408\u6210\u7ebf\u7a0b\u53ef\u4ee5\u51b3\u5b9a\u6805\u683c\u7ebf\u7a0b\u5149\u6805\u5757\u7684\u4f18\u5148\u7ea7\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u7528\u6237\u80fd\u770b\u5230\u7684\u90e8\u5206\u53ef\u4ee5\u5148\u88ab\u5149\u6805\u5316\u3002\u4e00\u4e2a\u5c42\u4e5f\u4f1a\u5305\u542b\u591a\u79cd\u5757\u4ee5\u652f\u6301\u7c7b\u4f3c\u7f29\u653e\u8fd9\u6837\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u5757\u88ab\u5149\u6805\u5316\u540e\uff0c\u5408\u6210\u7ebf\u7a0b\u4f1a\u4f7f\u7528 draw quads \u6536\u96c6\u8fd9\u4e9b\u4fe1\u606f\u5e76\u521b\u5efa\u5408\u6210\u5e27\uff08Compositor frame\uff09\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Draw quads<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b58\u50a8\u5728\u7f13\u5b58\u4e2d\uff0c\u5305\u542b\u7c7b\u4f3c\u5757\u4f4d\u7f6e\u8fd9\u6837\u7684\u4fe1\u606f\uff0c\u7528\u4e8e\u63cf\u8ff0\u5982\u4f55\u4f7f\u7528\u5757\u5408\u6210\u9875\u9762\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Compositor frame<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u4e8e\u5b58\u50a8\u8868\u73b0\u9875\u9762\u4e00\u5e27\u4e2d\u5305\u542b\u54ea\u4e9b Draw quads \u7684\u96c6\u5408\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\u4e00\u4e2a\u5408\u6210\u5e27\u88ab\u63d0\u4ea4\u7ed9\u6d4f\u89c8\u5668\u8fdb\u7a0b\u3002\u8fd9\u65f6\u5982\u679c\u6d4f\u89c8\u5668 UI \u6709\u53d8\u5316\uff0c\u6216\u8005\u63d2\u4ef6\u7684 UI \u6709\u53d8\u5316\u65f6\uff0c\u53e6\u4e00\u4e2a\u5408\u6210\u5e27\u5c31\u4f1a\u88ab\u521b\u5efa\u51fa\u6765\u3002\u6240\u4ee5\u6bcf\u5f53\u6709\u4ea4\u4e92\u53d1\u751f\u65f6\uff0c\u5408\u6210\u7ebf\u7a0b\u5c31\u4f1a\u521b\u5efa\u66f4\u591a\u7684\u5408\u6210\u5e27\u7136\u540e\u901a\u8fc7 GPU \u5c06\u65b0\u7684\u90e8\u5206\u6e32\u67d3\u51fa\u6765\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/39\/397d4949099dd6d1aaffcb55e8678e37.png\">composit.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5408\u6210\u7684\u597d\u5904\u5728\u4e8e\u5176\u72ec\u7acb\u4e8e\u4e3b\u7ebf\u7a0b\u3002\u5408\u6210\u7ebf\u7a0b\u4e0d\u9700\u8981\u7b49\u5f85\u6837\u5f0f\u8ba1\u7b97\u548c Javascript \u4ee3\u7801\u7684\u8fd0\u884c\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u5408\u6210\u66f4\u9002\u5408\u4f18\u5316\u4ea4\u4e92\u6027\u80fd\uff0c\u4f46\u5982\u679c\u5e03\u5c40\u6216\u8005\u7ed8\u5236\u9700\u8981\u91cd\u65b0\u8ba1\u7b97\u5219\u4e3b\u7ebf\u7a0b\u662f\u5fc5\u987b\u8981\u53c2\u4e0e\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u8d28\u4e0a\uff0c\u6d4f\u89c8\u5668\u7684\u6e32\u67d3\u8fc7\u7a0b\u5c31\u662f\u5c06\u6587\u672c\u8f6c\u6362\u6210\u56fe\u50cf\u7684\u8fc7\u7a0b\uff0c\u800c\u5f53\u7528\u6237\u4e0e\u9875\u9762\u53d1\u751f\u4ea4\u4e92\u52a8\u4f5c\u65f6\uff0c\u5219\u663e\u793a\u65b0\u7684\u56fe\u50cf\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u7531\u6e32\u67d3\u8fdb\u7a0b\u4e2d\u7684\u4e3b\u7ebf\u7a0b\u5b8c\u6210\u8ba1\u7b97\u5de5\u4f5c\uff0c\u7531\u5408\u6210\u7ebf\u7a0b\u548c\u6805\u683c\u7ebf\u7a0b\u5b8c\u6210\u56fe\u50cf\u7684\u7ed8\u5236\u5de5\u4f5c\u3002\u800c\u5728\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\uff0c\u8fd8\u6709\u5f3a\u5236\u5e03\u5c40\u3001\u91cd\u6392\u3001\u91cd\u7ed8\u7b49\u66f4\u52a0\u7ec6\u8282\u7684\u6982\u5ff5\u4f1a\u5728\u540e\u9762\u7684\u6587\u7ae0\u4e2d\u505a\u8bb2\u89e3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ece\u6d4f\u89c8\u5668\u7684\u89d2\u5ea6\u770b\u4e8b\u4ef6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u6211\u4eec\u542c\u5230\u4e8b\u4ef6\u65f6\uff0c\u901a\u5e38\u4f1a\u8054\u60f3\u5230\u5728\u4e00\u4e2a\u6587\u672c\u6846\u4e2d\u8f93\u5165\u6216\u8005\u5355\u51fb\u9f20\u6807\uff0c\u4f46\u4ece\u6d4f\u89c8\u5668\u7684\u89d2\u5ea6\u770b\uff0c\u8f93\u5165\u4e8b\u4ef6\u610f\u5473\u7740\u6240\u6709\u7684\u7528\u6237\u52a8\u4f5c\u3002\u9f20\u6807\u6eda\u8f6e\u6eda\u52a8\u6216\u8005\u5c4f\u5e55\u89e6\u6478\u90fd\u662f\u8f93\u5165\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u7528\u6237\u4e0e\u9875\u9762\u53d1\u751f\u4ea4\u4e92\u65f6\uff0c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u9996\u5148\u63a5\u6536\u5230\u4e8b\u4ef6\uff0c\u7136\u800c\uff0c\u6d4f\u89c8\u5668\u8fdb\u7a0b\u53ea\u5173\u5fc3\u4e8b\u4ef6\u53d1\u751f\u65f6\u662f\u5728\u54ea\u4e2a\u9875\u7b7e\u4e2d\uff0c\u6240\u4ee5\u6d4f\u89c8\u5668\u8fdb\u7a0b\u4f1a\u5c06\u4e8b\u4ef6\u7c7b\u578b\u548c\u4f4d\u7f6e\u4fe1\u606f\u7b49\u53d1\u9001\u7ed9\u8d1f\u8d23\u5f53\u524d\u9875\u7b7e\u7684\u6e32\u67d3\u8fdb\u7a0b\uff0c\u6e32\u67d3\u8fdb\u7a0b\u4f1a\u6070\u5f53\u7684\u627e\u5230\u4e8b\u4ef6\u53d1\u751f\u7684\u5143\u7d20\u5e76\u4e14\u89e6\u53d1\u4e8b\u4ef6\u76d1\u542c\u5668\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/7f\/7f8581ec78d48302c8ea81f713cdfa56.png\">input (1).png<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5408\u6210\u7ebf\u7a0b\u5bf9\u4e8b\u4ef6\u7684\u5904\u7406<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u524d\u9762\u7684\u7ae0\u8282\u4e2d\uff0c\u6211\u4eec\u77e5\u9053\u4e86\u5408\u6210\u7ebf\u7a0b\u53ef\u4ee5\u901a\u8fc7\u5408\u6210\u6280\u672f\u5408\u6210\u4e0d\u540c\u7684\u5149\u6805\u5c42\u4f18\u5316\u6027\u80fd\uff0c\u5982\u679c\u9875\u9762\u5e76\u4e0d\u76d1\u542c\u4efb\u4f55\u4e8b\u4ef6\uff0c\u5408\u6210\u7ebf\u7a0b\u53ef\u4ee5\u5b8c\u5168\u72ec\u7acb\u4e8e\u4e3b\u7ebf\u7a0b\u751f\u6210\u65b0\u7684\u5408\u6210\u5e27\u3002\u4f46\u5982\u679c\u9875\u9762\u76d1\u542c\u4e86\u4e8b\u4ef6\u5462\uff1f<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6807\u8bb0\u201c\u6162\u6eda\u52a8\u201d\u533a\u57df<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u8fd0\u884c Javascript \u662f\u4e3b\u7ebf\u7a0b\u7684\u5de5\u4f5c\uff0c\u5f53\u9875\u9762\u88ab\u5408\u6210\u7ebf\u7a0b\u5408\u6210\u8fc7\uff0c\u5408\u6210\u7ebf\u7a0b\u4f1a\u6807\u8bb0\u90a3\u4e9b\u6709\u4e8b\u4ef6\u76d1\u542c\u7684\u533a\u57df\u3002\u6709\u4e86\u8fd9\u4e9b\u4fe1\u606f\uff0c\u5f53\u4e8b\u4ef6\u53d1\u751f\u5728\u54cd\u5e94\u7684\u533a\u57df\u65f6\uff0c\u5408\u6210\u7ebf\u7a0b\u5c31\u4f1a\u5c06\u4e8b\u4ef6\u53d1\u9001\u7ed9\u4e3b\u7ebf\u7a0b\u5904\u7406\u3002\u5982\u679c\u5728\u975e\u4e8b\u4ef6\u76d1\u542c\u533a\u57df\uff0c\u5219\u6e32\u67d3\u8fdb\u7a0b\u76f4\u63a5\u521b\u5efa\u65b0\u7684\u5e27\u800c\u4e0d\u5173\u5fc3\u4e3b\u7ebf\u7a0b\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/6f\/6fda6b7355162ca393787e870630a083.png\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5728\u4e8b\u4ef6\u76d1\u542c\u65f6\u6807\u8bb0<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 web \u5f00\u53d1\u4e2d\u5e38\u89c1\u7684\u65b9\u5f0f\u5c31\u662f\u4e8b\u4ef6\u4ee3\u7406\u3002\u5229\u7528\u4e8b\u4ef6\u5192\u6ce1\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u76ee\u6807\u5143\u7d20\u7684\u4e0a\u5c42\u5143\u7d20\u4e2d\u76d1\u542c\u4e8b\u4ef6\u3002\u53c2\u7167\u4e0b\u9762\u7684\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>document.body.addEventListener('touchstart', event =&gt; {<\/code><code>  if (event.target === area) {<\/code><code>    event.preventDefault();<\/code><code>  }<\/code><code>});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u590d\u5236\u4ee3\u7801<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u8fd9\u79cd\u5199\u6cd5\uff0c\u53ef\u4ee5\u66f4\u9ad8\u6548\u7684\u76d1\u542c\u4e8b\u4ef6\u3002\u4f46\u5982\u679c\u4ece\u6d4f\u89c8\u5668\u7684\u89d2\u5ea6\u770b\uff0c\u6b64\u65f6\u6574\u4e2a\u9875\u9762\u4f1a\u88ab\u6807\u8bb0\u6210\u201c\u6162\u6eda\u52a8\u201d\u533a\u57df\u3002\u8fd9\u610f\u5473\u7740\u867d\u7136\u9875\u9762\u4e2d\u7684\u67d0\u4e9b\u90e8\u5206\u5e76\u4e0d\u9700\u8981\u4e8b\u4ef6\u76d1\u542c\uff0c\u4f46\u5408\u6210\u7ebf\u7a0b\u4f9d\u7136\u8981\u5728\u6bcf\u6b21\u4ea4\u4e92\u53d1\u751f\u540e\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u5904\u7406\u4e8b\u4ef6\uff0c\u5408\u6210\u7ebf\u7a0b\u7684\u4f18\u5316\u6548\u679c\u4e0d\u590d\u5b58\u5728\u3002<img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/f2\/f2e60c76e1cb2b104a46c0da8787d229.png\">nfsr2.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u5728\u4e8b\u4ef6\u4ee3\u7406\u65f6\u4f20\u5165<code>passive: true<\/code><strong>\uff08IE \u4e0d\u652f\u6301\uff09<\/strong>\u53c2\u6570\u3002\u8fd9\u6837\u544a\u8bc9\u6e32\u67d3\u7ebf\u7a0b\uff0c\u4f9d\u7136\u9700\u8981\u5c06\u4e8b\u4ef6\u53d1\u9001\u7ed9\u4e3b\u7ebf\u7a0b\u5904\u7406\uff0c\u4f46\u4e0d\u9700\u8981\u7b49\u5f85\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>document.body.addEventListener('touchstart', event =&gt; {<\/code><code>    if (event.target === area) {<\/code><code>        event.preventDefault()<\/code><code>    }<\/code><code> }, {passive: true});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u590d\u5236\u4ee3\u7801<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u4e8e\u4f7f\u7528 passive \u6539\u5584\u6eda\u5c4f\u6027\u80fd\uff0c\u53ef\u4ee5\u53c2\u8003<a href=\"https:\/\/developer.mozilla.org\/zh-CN\/docs\/Web\/API\/EventTarget\/addEventListener#%E4%BD%BF%E7%94%A8_passive_%E6%94%B9%E5%96%84%E7%9A%84%E6%BB%9A%E5%B1%8F%E6%80%A7%E8%83%BD\">MDN \u4f7f\u7528passive\u6539\u5584\u6eda\u5c4f\u6027\u80fd<\/a>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u67e5\u627e\u4e8b\u4ef6\u76ee\u6807<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><img decoding=\"async\" src=\"https:\/\/static001.geekbang.org\/infoq\/0e\/0eb159798080da4adc7ffb76cf184ffa.png\">hittest.png<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u6e32\u67d3\u7ebf\u7a0b\u5c06\u4e8b\u4ef6\u53d1\u9001\u7ed9\u4e3b\u7ebf\u7a0b\u540e\uff0c\u7b2c\u4e00\u4ef6\u4e8b\u5c31\u662f\u627e\u5230\u4e8b\u4ef6\u89e6\u53d1\u7684\u76ee\u6807\u3002\u901a\u8fc7\u5728\u6e32\u67d3\u8fc7\u7a0b\u4e2d\u751f\u6210\u7684\u7ed8\u5236\u4fe1\u606f\uff0c\u53ef\u4ee5\u6839\u636e\u5750\u6807\u627e\u5230\u76ee\u6807\u5143\u7d20\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u51cf\u5c11\u53d1\u9001\u7ed9\u4e3b\u7ebf\u7a0b\u7684\u4e8b\u4ef6\u6570\u91cf<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u4fdd\u8bc1\u52a8\u753b\u7684\u987a\u7545\uff0c\u9700\u8981\u663e\u793a\u5668\u5728\u6bcf\u79d2\u5237\u65b0 60 \u6b21\u3002\u5bf9\u4e8e\u5178\u578b\u7684\u89e6\u6478\u4e8b\u4ef6\u7531\u5408\u6210\u7ebf\u7a0b\u63d0\u4ea4\u7ed9\u4e3b\u7ebf\u7a0b\u7684\u4e8b\u4ef6\u9891\u7387\u53ef\u4ee5\u8fbe\u5230\u6bcf\u79d2 60-120 \u6b21\uff0c\u5bf9\u4e8e\u5178\u578b\u7684\u9f20\u6807\u4e8b\u4ef6\u6bcf\u79d2\u4f1a\u53d1\u9001 100 \u6b21\u3002\u4e8b\u4ef6\u53d1\u9001\u7684\u9891\u7387\u901a\u5e38\u6bd4\u5c4f\u5e55\u5237\u65b0\u9891\u7387\u8981\u9ad8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u7c7b\u4f3c<code>touchmove<\/code>\u8fd9\u6837\u7684\u4e8b\u4ef6\u6bcf\u79d2\u5411\u4e3b\u7ebf\u7a0b\u53d1\u9001 120 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