{"id":38111,"date":"2023-09-12T09:33:21","date_gmt":"2023-06-12T08:21:12","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%a0%e4%bb%ac%e7%9a%84react%e5%be%88%e6%85%a2\/"},"modified":"2024-05-03T23:20:36","modified_gmt":"2024-05-03T15:20:36","slug":"%e4%bd%a0%e4%bb%ac%e7%9a%84react%e5%be%88%e6%85%a2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%a0%e4%bb%ac%e7%9a%84react%e5%be%88%e6%85%a2\/","title":{"rendered":"\u4f60\u4eec\u7684React\u5f88\u6162"},"content":{"rendered":"<p>\u62b1\u6b49\uff0c\u6807\u9898\u5938\u5f20\u4e86\u4e00\u70b9\u3002<br \/>\n\u6700\u8fd1\u5728\u8fdb\u884cReact\u9879\u76ee\u9875\u9762\u7684\u5f00\u53d1\u65f6\uff0c\u6211\u53d1\u73b0\u9875\u9762\u6e32\u67d3\u6709\u70b9\u6162\uff08\u8d1f\u8f7d\u5f88\u9ad8\uff09\uff0c\u6240\u4ee5\u601d\u8003\u4e86\u5982\u4f55\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff0c\u6211\u603b\u7ed3\u4e86\u4ee5\u4e0b\u7684\u65b9\u6cd5\u3002\u4e0d\u4f1a\u8ba8\u8bbapreact\u6216\u5176\u4ed6\u5e93\u7684\u4e8b\u3002<\/p>\n<p>\u5982\u679c\u6709\u5174\u8da3\uff0c\u8fd9\u91cc\u4e5f\u53ef\u4ee5\u770b\u770b\uff1a<br \/>\n\u4ee5ReactJS\u521b\u5efa\u73b0\u4ee3SPA\u5165\u95e8\uff08\u57fa\u7840\u7bc7\uff09<\/p>\n<p>2019\u5e7407\u670806\u65e5\u88dc\u5145\uff1a<br \/>\n\u5173\u4e8e\u6d4f\u89c8\u5668\u6e32\u67d3\u673a\u5236\u6709\u4e00\u7bc7\u4e0d\u9519\u7684\u6587\u7ae0\uff0c\u5efa\u8bae\u5148\u9605\u8bfb\u4e00\u4e0b\u3002<br \/>\n\u4f18\u8d28\u6587\u7ae01\uff1a\u5b9e\u9645\u4e0a\u201c\u6253\u5f00\u6d4f\u89c8\u5668\u76f4\u5230\u9875\u9762\u663e\u793a\u51fa\u6765\u201d\u4f1a\u53d1\u751f\u4ec0\u4e48\uff1f<br \/>\n\u4f18\u8d28\u6587\u7ae02\uff1a\u6d4f\u89c8\u5668\u6e32\u67d3\u5165\u95e8-\u901a\u8fc7\u4e86\u89e3\u53d8\u5f97\u53ef\u89c1\u7684\u4e16\u754c<br \/>\n\u4e00\u4e2a\u50cf\u7d20\u663e\u793a\u5728\u6d4f\u89c8\u5668\u4e2d\u7684\u8fc7\u7a0b\uff1a\u50cf\u7d20\u7684\u751f\u547d 2018<\/p>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u8bb2\u8ff0\u4e86\u5173\u4e8eReact DOM\u6811\uff08\u5e03\u5c40\uff09\u6e32\u67d3\u7684\u4f18\u5316\u7b56\u7565\u3002<\/p>\n<p>2020\u5e7402\u670815\u65e5\u66f4\u65b0\uff1a<br \/>\n\u7eed\u96c6\uff1a\u4f60\u4eec\u7684React\u592a\u6162\u4e86\uff08SSG\u7248\u672c\uff09<\/p>\n<p>2022\u5e7407\u670804\u65e5\u66f4\u65b0\uff1a<br \/>\n\u901a\u8fc7\u7981\u7528ISR\u548cCSR\u5728\u57fa\u7840\u67b6\u6784\u7ea7\u522b\u52a8\u6001\u751f\u6210\u9759\u6001HTML\uff01\uff1a\u63a8\u8350\u9ad8\u901f\u7684Headless NextJS.<\/p>\n<p>2023\u5e7410\u670809\u65e5\u66f4\u65b0\uff1a<br \/>\n\u9ad8\u901f\u53ef\u4f38\u7f29\u7f51\u9875\u521b\u5efa\u529f\u80fd\u7684\u6700\u7ec8\u5f62\u5f0f\uff1aQwik\u5c55\u793a\u4e86\u4ee4\u4eba\u60ca\u53f9\u7684\u5185\u5bb9\u53ef\u4f38\u7f29\u5e76\u4e14\u6781\u901f\u7684\u7f51\u9875\u6700\u7ec8\u5f62\u5f0f<\/p>\n<h1>\u94c1\u8def\u6a21\u578b<\/h1>\n<p>\u9996\u5148\uff0c\u6709\u4e00\u4efd\u8c37\u6b4c\u7684\u6027\u80fd\u6307\u5357\uff0c\u5176\u4e2d\u4f7f\u7528RAIL\u6a21\u578b\u6765\u8861\u91cf\u6027\u80fd\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e6\u30fc\u30b6\u30fc\u3092\u7b2c\u4e00\u306b\u8003\u3048\u307e\u3059\u3002\u6700\u7d42\u76ee\u6a19\u306f\u3001\u7279\u5b9a\u306e\u7aef\u672b\u3067\u306e\u30b5\u30a4\u30c8\u306e\u51e6\u7406\u901f\u5ea6\u3092\u4e0a\u3052\u308b\u3053\u3068\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e6\u30fc\u30b6\u30fc\u304c\u6e80\u8db3\u611f\u3092\u5f97\u308b\u3053\u3068\u304c\u6700\u7d42\u76ee\u6a19\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e6\u30fc\u30b6\u30fc\u306b\u5bfe\u3057\u3066\u5373\u5ea7\u306b\u5fdc\u7b54\u3057\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306f\u3001100 \u30df\u30ea\u79d2\u4ee5\u5185\u306b\u8a8d\u8b58\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3084\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u306f\u300110 \u30df\u30ea\u79d2\u4ee5\u5185\u306b\u30d5\u30ec\u30fc\u30e0\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9\u306e\u30a2\u30a4\u30c9\u30eb\u6642\u9593\u3092\u6700\u5927\u9650\u306b\u6d3b\u7528\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30e6\u30fc\u30b6\u30fc\u306e\u4f5c\u696d\u3092\u59a8\u3052\u307e\u305b\u3093\u3002\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6 \u30b3\u30f3\u30c6\u30f3\u30c4\u306f 1000 \u30df\u30ea\u79d2\u4ee5\u5185\u306b\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/ul>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/10-0.png\" alt=\"rail.png\" \/><\/div>\n<h2>\u7528\u6237\u5bf9\u5ef6\u8fdf\u7684\u53cd\u5e94<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">0\uff5e16 \u30df\u30ea\u79d2: \u3068\u3066\u3082\u826f\u3044\u3001\u30b2\u30fc\u30e0\u3068\u304b\u3067\u308260FPS(1\u30d5\u30ec\u30fc\u30e0\u3042\u305f\u308a\u306e\u63cf\u753b\u9593\u9694\u304c16\u30df\u30ea\u79d2)\u3068\u304b\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">0\uff5e100 \u30df\u30ea\u79d2: \u30da\u30fc\u30b8\u5185\u52d5\u4f5c\u3068\u3057\u3066\u306f\u8a31\u5bb9\u7bc4\u56f2<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">100\uff5e300 \u30df\u30ea\u79d2: \u30da\u30fc\u30b8\u5185\u52d5\u4f5c\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u3068\u3057\u3066\u306f\u3084\u3084\u9045\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">300\uff5e1000 \u30df\u30ea\u79d2: \u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u5358\u4f4d\u3067\u3042\u308c\u3070\u30b9\u30e0\u30fc\u30ba\u306a\u4f53\u9a13\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">1000 \u30df\u30ea\u79d2\u4ee5\u4e0a: \uff11\u79d2\u3092\u8d85\u3048\u308b\u3068\u30e6\u30fc\u30b6\u306f\u5b9f\u884c\u3057\u305f\u30bf\u30b9\u30af\u3078\u306e\u95a2\u5fc3\u3092\u5931\u3046<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">10,000 \u30df\u30ea\u79d2\u4ee5\u4e0a: \u30e6\u30fc\u30b6\u30fc\u306f\u4e0d\u6e80\u3092\u611f\u3058\u3066\u30bf\u30b9\u30af\u3092\u4e2d\u65ad\u3057\u3001\u305d\u306e\u307e\u307e\u623b\u3063\u3066\u3053\u306a\u3044\u6050\u308c\u304c\u3042\u308a\u307e\u3059<\/ul>\n<p>\u5728\u7528\u6237\u4f53\u9a8c\u65b9\u9762\uff0c\u5feb\u901f\u54cd\u5e94\u662f\u4e00\u79cd\u4f18\u52bf\u3002<\/p>\n<h1>\u53ef\u89c6\u5316\u663e\u793a\u54ea\u4e2a\u7ec4\u4ef6\u6b63\u5728\u8fdb\u884c\u6e32\u67d3\u3002<\/h1>\n<p>\u53ef\u4ee5\u4f7f\u7528Chrome\u7684React Devtools\u63d2\u4ef6\u4e2d\u7684Highlight Update\u529f\u80fd\u6765\u53ef\u89c6\u5316\u6e32\u67d3\u7684\u4f4d\u7f6e\u3002\u6e32\u67d3\u7684\u5730\u65b9\u5c06\u4ee5\u8fb9\u6846\u65b9\u5f0f\u9ad8\u4eae\u663e\u793a\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/16-0.gif\" alt=\"\u753b\u9762\u53ce\u9332-2018-12-01-15.31.422.gif\" \/><\/div>\n<h1>React 16\u7684\u6e32\u67d3\u6027\u80fd\u6d4b\u91cf\u65b9\u6cd5<\/h1>\n<p>\u4f7f\u7528React 16\u548cChrome Devtools\u8c03\u8bd5React\u6027\u80fd\u7684\u65b9\u6cd5\u4e0e\u539f\u6587\u5b8c\u5168\u4e00\u6837\u3002<\/p>\n<p>\u7531\u4e8eReact Devtool\u63d2\u4ef6\u7b49\u53ef\u80fd\u5bf9\u6e32\u67d3\u6027\u80fd\u4ea7\u751f\u8d1f\u9762\u5f71\u54cd\uff0c\u5efa\u8bae\u5728\u5b9e\u9645\u6d4b\u91cf\u65f6\u5c06\u5176\u7981\u7528\u3002<br \/>\n\u4e3a\u4e86\u5145\u5206\u5229\u7528\u5c4f\u5e55\u7a7a\u95f4\uff0c\u5c06Chrome Dev tool\u7684\u7a97\u53e3\u62c6\u5206\u51fa\u6765\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/20-0.gif\" alt=\"2.gif\" \/><\/div>\n<p>\u5b9e\u9645\u8fd0\u884c\u73af\u5883\u672a\u5fc5\u662f\u9ad8\u6027\u80fd\u7684\u4e2a\u4eba\u7535\u8111\u3002\u53ef\u80fd\u662f\u4f4e\u6027\u80fd\u7684\u79fb\u52a8\u8bbe\u5907\u3002<br \/>\n\u5728\u6027\u80fd\u9009\u9879\u5361\u4e2d\uff0c\u6709\u4e00\u4e2a\u53ef\u4ee5\u6a21\u62df\u964d\u7ea7\u7684CPU\u8bbe\u7f6e\u3002<br \/>\n\u5728\u7f51\u7edc\u8bbe\u7f6e\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u6a21\u62df\u901a\u4fe1\u73af\u5883\u4e0d\u4f73\uff0c\u6bd4\u59823G\u7f51\u7edc\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/22-0.gif\" alt=\"3.gif\" \/><\/div>\n<p>\u5237\u65b0\u9875\u9762\u5e76\u6d4b\u91cf\u52a0\u8f7d\u6027\u80fd\u9700\u8981\u6309\u4e0b\u6027\u80fd\u9009\u9879\u5361\u4e0a\u7684\u66f4\u65b0\u6309\u94ae\u3002<br \/>\n\u8981\u5728\u9875\u9762\u5185\u6267\u884c\u64cd\u4f5c\u5e76\u8fdb\u884c\u6d4b\u91cf\uff0c\u8bf7\u6309\u4e0b\u6307\u5b9a\u6309\u94ae\uff0c\u7136\u540e\u6309\u4e0b\u505c\u6b62\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/24-0.gif\" alt=\"4.gif\" \/><\/div>\n<p>\u811a\u672c\u6267\u884c\u7684\u90e8\u5206\u662f\u9ec4\u8272\u90e8\u5206\u3002\u603b\u7ed3\u4e2d\u663e\u793a\u4e86\u811a\u672c\u6267\u884c\u7684\u603b\u65f6\u95f4\u3002\u84dd\u7ebf\u8868\u793aDOMContentLoaded\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u95f4\uff0c\u5373\u9996\u6b21\u5b8c\u6210DOM\u89e3\u6790\u7684\u65f6\u95f4\uff0c\u7ea2\u7ebf\u8868\u793aload\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u95f4\uff0c\u5373\u9875\u9762\u5b8c\u5168\u52a0\u8f7d\u7684\u65f6\u95f4\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/26-0.png\" alt=\"5.png\" \/><\/div>\n<p>\u6253\u5f00 User Timing\uff0c\u7136\u540e\u8f6c\u5230 React \u5904\u7406\u7684\u90e8\u5206\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/28-1.gif\" alt=\"1.gif\" \/><\/div>\n<p>\u5982\u679c\u5b58\u5728\u6e90\u4ee3\u7801\u6620\u5c04\u6587\u4ef6\uff0c\u60a8\u53ef\u4ee5\u66f4\u8fdb\u4e00\u6b65\u4e86\u89e3\u5728\u5904\u7406\u8fc7\u7a0b\u7684\u54ea\u4e2a\u90e8\u5206\u82b1\u8d39\u4e86\u65f6\u95f4\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u70b9\u51fb\u6846\u67b6\u56fe\u7684\u6761\u5f62\u56fe\uff0c\u53ef\u4ee5\u4e86\u89e3\u6bcf\u4e2a\u64cd\u4f5c\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6253\u5f00\u201cBottom-Up\u201d\u6807\u7b7e\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5bf9\u65f6\u95f4\u8fdb\u884c\u6392\u5e8f\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5982\u679c\u6709\u6e90\u4ee3\u7801\u6620\u5c04\u6587\u4ef6\uff0c\u5c06\u4f1a\u663e\u793a\u51fa\u6765\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u53ef\u4ee5\u8c03\u67e5\u5b9e\u9645\u6e90\u4ee3\u7801\u4e2d\u54ea\u91cc\u82b1\u8d39\u4e86\u65f6\u95f4\u3002<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/31-0.png\" alt=\"7.png\" \/><\/div>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/32-0.png\" alt=\"8.png\" \/><\/div>\n<p>\u5982\u679c\u5728webpack\u4e2d\u6784\u5efaSourceMap\u6587\u4ef6\uff0c\u53ef\u4ee5\u901a\u8fc7webpack.config.js\u4e2d\u7684devtool\u8bbe\u7f6e\u8fdb\u884c\u8f93\u51fa\u3002<br \/>\n\u6709\u5173\u8f93\u51fa\u683c\u5f0f\uff0c\u8bf7\u53c2\u8003webpack\u5b98\u65b9\u6587\u6863\u3002<\/p>\n<p>\u53c2\u8003\uff1a\u5f00\u53d1\u5de5\u5177<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">mode<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">development<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ \u958b\u767a\u30e2\u30fc\u30c9<\/span>\r\n  <span class=\"na\">devtool<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">source-map<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ \u30bd\u30fc\u30b9\u30de\u30c3\u30d7\u30d5\u30a1\u30a4\u30eb\u51fa\u529b<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u5728React\u4e2d\u63d0\u5347\u6e32\u67d3\u6027\u80fd\u7684\u4f18\u5316\u7b56\u7565<\/h1>\n<p>\u5047\u8bbe\u5728\u67d0\u4e2a\u9875\u9762\u4e0a\u663e\u793a\u4e86\u5982\u4e0bDOM\u6811\u7ed3\u6784\u3002\u6bcf\u4e2a\u8282\u70b9\u90fd\u662f\u4e00\u4e2aReact\u7ec4\u4ef6\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/38-0.png\" alt=\"\u7121\u984c\u306e\u56f3\u5f62\u63cf\u753b.png\" \/><\/div>\n<p>\u5f53\u5728\u672b\u7aef\u8282\u70b9D\u4e0a\u8c03\u7528setState\u6765\u6539\u53d8\u7ec4\u4ef6\u72b6\u6001\u65f6\uff0c\u5c06\u89e6\u53d1D\u7684\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53d7\u5f71\u54cd\u7684\u8303\u56f4\u4ec5\u9650\u4e8eD\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/40-0.png\" alt=\"\u7121\u984c\u306e\u56f3\u5f62\u63cf\u753b (1).png\" \/><\/div>\n<p>\u5982\u679c\u5728\u7236\u7ec4\u4ef6A\u4e2d\u8c03\u7528\u4e86setState\uff0c\u90a3\u4e48A\u7684render\u65b9\u6cd5\u4f1a\u88ab\u8c03\u7528\uff0c\u5e76\u4e14\u6240\u6709\u5b50\u7ec4\u4ef6\u90fd\u4f1a\u88ab\u91cd\u65b0\u6e32\u67d3\u3002\uff08\u53ea\u6709\u5b50\u7ec4\u4ef6\u662fReact.Component\u6216\u8005\u65e0\u72b6\u6001\u7ec4\u4ef6\u7684\u60c5\u51b5\u4e0b\u624d\u4f1a\u89e6\u53d1\u91cd\u65b0\u6e32\u67d3\uff09<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u4e00\u4e9b\u5b50\u7ec4\u4ef6\u4e0d\u9700\u8981\u91cd\u65b0\u6e32\u67d3\uff0c\u5b83\u4eec\u7684render\u65b9\u6cd5\u4e5f\u4f1a\u88ab\u8c03\u7528\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u65e0\u7528\u7684\u6e32\u67d3\u3002<br \/>\n\uff08\u65e0\u8bba\u662f\u5c06state\u53c2\u6570\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u7684props\u8fd8\u662f\u5176\u4ed6\u65b9\u5f0f\uff0c\u5b50\u7ec4\u4ef6\u53ca\u4ee5\u4e0b\u7684render\u65b9\u6cd5\u90fd\u4f1a\u88ab\u8c03\u7528\uff01\uff09<br \/>\n\u5982\u679c\u7236\u7ec4\u4ef6\u4e0b\u6302\u8f7d\u7684\u5b50\u7ec4\u4ef6\u5f88\u591a\uff0c\u90a3\u4e48\u5982\u679c\u6ca1\u6709\u91c7\u53d6\u4efb\u4f55\u63aa\u65bd\uff0c\u6e32\u67d3\u8d1f\u62c5\u4f1a\u9010\u6e10\u589e\u52a0\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/42-0.png\" alt=\"\u7121\u984c\u306e\u56f3\u5f62\u63cf\u753b.png\" \/><\/div>\n<p>\u5982\u679c\u4f7f\u7528redux\u548creact-redux\uff0c\u53ef\u4ee5\u5c06\u6e32\u67d3\u5f71\u54cd\u7684\u7ec4\u4ef6\u9650\u5b9a\u5728\u7279\u5b9a\u8303\u56f4\u5185\uff08\u53ea\u53c2\u8003connect\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570mapStateToProps\u7684\u90e8\u5206\uff09\u3002\u8fd9\u79cd\u7ed3\u6784\u7684\u597d\u5904\u662f\u53ef\u4ee5\u901a\u8fc7connect\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570mapDispatchToProps\u4ece\u4efb\u4f55\u5730\u65b9\u8c03\u7528redux\u7684\u64cd\u4f5c\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u7236\u7ec4\u4ef6\uff08\u5728\u56fe\u4e2d\u4e3aA\uff09\u4e0d\u5e94\u8be5\u5f15\u7528mapStateToProps\uff08\u5982\u679c\u5f15\u7528\u5e76\u66f4\u65b0A\u7684props\uff0c\u6574\u4e2a\u6811\u5c06\u4f1a\u91cd\u65b0\u6e32\u67d3\uff09\u3002\u4f46\u662f\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cB\u4ee5\u4e0b\u7684D\u548cE\u4ecd\u7136\u4f1a\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/44-0.png\" alt=\"\u7121\u984c\u306e\u56f3\u5f62\u63cf\u753b.png\" \/><\/div>\n<p>\u4e3a\u4e86\u663e\u8457\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff0c\u60a8\u9700\u8981\u5728\u5b50\u7ec4\u4ef6\u4e2d\u91cd\u5199 shouldComponentUpdate \u65b9\u6cd5\uff0c\u5e76\u6839\u636e\u6761\u4ef6\u8fd4\u56de false\uff08\u9ed8\u8ba4\u4e3a true\uff09\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/46-0.jpeg\" alt=\"1_cEWErpe-oY-_S1dOaT1NtA.jpeg\" \/><\/div>\n<p>\u5982\u679c\u8981\u81ea\u5df1\u7f16\u5199shouldComponentUpdate\uff0c\u9700\u8981\u6bd4\u8f83\u4f20\u5165shouldComponentUpdate\u7684props\u3001state\u548c\u7ec4\u4ef6\u81ea\u8eab\u7684props\u3001state\uff0c\u53ea\u6709\u6709\u5dee\u5f02\u624d\u4f1a\u8fdb\u884c\u6e32\u67d3\u5224\u65ad\u3002<\/p>\n<p>\u53c2\u8003\uff1a\u5c3d\u91cf\u51cf\u5c11React\u7684\u91cd\u65b0\u6e32\u67d3\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">SampleComponent<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">static<\/span> <span class=\"kd\">get<\/span> <span class=\"nf\">defaultProps<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"na\">sampleProp<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"na\">sampleState<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nf\">shouldComponentUpdate<\/span><span class=\"p\">(<\/span><span class=\"nx\">nextProps<\/span><span class=\"p\">,<\/span> <span class=\"nx\">nextState<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"o\">!<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">sampleState<\/span> <span class=\"o\">===<\/span> <span class=\"nx\">nextState<\/span><span class=\"p\">.<\/span><span class=\"nx\">sampleState<\/span> <span class=\"o\">&amp;&amp;<\/span>\r\n             <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">props<\/span><span class=\"p\">.<\/span><span class=\"nx\">sampleProp<\/span> <span class=\"o\">===<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">props<\/span><span class=\"p\">.<\/span><span class=\"nx\">SampleProp<\/span><span class=\"p\">)<\/span>\r\n\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nf\">render<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ \u7565<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u81eaReact 15.3\u7248\u672c\u5f00\u59cb\uff0c\u53ef\u4ee5\u4f7f\u7528PureComponent\u81ea\u52a8\u5904\u7406\u4e0a\u8ff0shouldComponentUpdate\u7684\u5224\u65ad\u64cd\u4f5c\u3002<br \/>\n\u7b80\u5355\u7684\u505a\u6cd5\u662f\u5c06React.Component\u66ff\u6362\u4e3aReact.PureComponent\uff0c<br \/>\n\u5bf9\u4e8e\u65e0\u72b6\u6001\u51fd\u6570\u7ec4\u4ef6\uff08SFC\uff09\uff0c\u53ef\u4ee5\u5728React 16.6\u7248\u672c\u4e4b\u540e\u4f7f\u7528React.memo\u8fdb\u884c\u5305\u88f9\u3002<br \/>\n\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u901a\u8fc7connect\u8fde\u63a5\u7684\u7ec4\u4ef6\u9ed8\u8ba4\u4f1a\u88ab\u89c6\u4e3aPureComponent\u5904\u7406\u3002<br \/>\n\u53c2\u8003: connect\u7684\u7b2c\u56db\u4e2a\u53c2\u6570options\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a\u57fa\u672c\u4e0a\u53ef\u4ee5\u91c7\u7528PureComponent\u3001React.memo\u548creact-redux\u7684connect\u7ed3\u5408\u8d77\u6765\uff0c\u4f46\u5fc5\u987b\u6ce8\u610f\u4e0b\u9762\u7684\u53cd\u6a21\u5f0f\u3002<\/p>\n<h2>\u5f15\u53d1 PureComponent \u7684\u91cd\u65b0\u6e32\u67d3\u7684\u53cd\u6a21\u5f0f<\/h2>\n<p>\u7279\u522b\u662f\u5728\u5c06\u53c2\u6570\u4f20\u9012\u7ed9\u5b50PureComponent\u7684props\u65f6\uff0c\u9700\u8981\u6ce8\u610f\uff0c\u5426\u5219\u4f1a\u5f15\u53d1\u5b50\u7ec4\u4ef6\u7684\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\n\u4f20\u9012\u7ed9props\u7684\u5185\u5bb9\u4e0d\u9700\u8981\u91cd\u65b0\u751f\u6210\uff0c\u5bf9\u5417\uff1f<br \/>\n\u5728render\u4e2d\u5c3d\u91cf\u907f\u514d\u5b9a\u4e49\u53d8\u91cf\u6216\u7acb\u5373\u6267\u884c\u3002<\/p>\n<p>\u8bf7\u52ff\u5c06\u7bad\u5934\u51fd\u6570\u4f20\u9012\u7ed9\u3010React\u3011PureComponent\u3002<\/p>\n<p>\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u5173\u4e8eref\uff0c\u4e0d\u5fc5\u4f7f\u7528props\uff0c\u53ef\u4ee5\u4f20\u9012\u5185\u8054\u7bad\u5934\u51fd\u6570\u4e5f\u53ef\u4ee5\u3002\u53c2\u8003\uff1a\u5373\u4f7f\u5728PureComponent\u4e2d\u4e5f\u53ef\u4ee5\u4f20\u9012\u5185\u8054\u7bad\u5934\u51fd\u6570\u3002<\/p>\n<h3>\u7528\u7acb\u5373\u6267\u884c\u51fd\u6570\u5c06\u7bad\u5934\u51fd\u6570\u4f20\u9012\u7ed9props\u3002<\/h3>\n<p>\u5982\u679c\u76f4\u63a5\u5c06\u5373\u65f6\u51fd\u6570\u4f20\u9012\u7ed9props\uff0c\u90a3\u4e48\u6bcf\u6b21\u8c03\u7528\u7236\u7ec4\u4ef6\u7684render\u65f6\uff0c\u5373\u65f6\u51fd\u6570\u90fd\u4f1a\u4f5c\u4e3a\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u91cd\u65b0\u751f\u6210\u3002<br \/>\n\u56e0\u6b64\uff0c\u5728PureComponent\u7684shouldComponentUpdate\u65b9\u6cd5\u4e2d\uff0c\u4f1a\u8ba4\u4e3a\u4f20\u5165\u7684props\u662f\u4e0d\u540c\u7684\uff0c\u4ece\u800c\u5bfc\u81f4\u91cd\u65b0\u6e32\u67d3\u3002<br \/>\n\u4e0b\u9762\u7684\u793a\u4f8b\u662f\u5c06\u7236\u7ec4\u4ef6\u7684\u5904\u7406\u51fd\u6570\u901a\u8fc7change props\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u30fb\u4e0d\u5141\u8bb8<\/p>\n<pre class=\"post-pre\"><code> <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">change<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hoge<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30fb\u597d\u7684 de)<\/p>\n<p>\u4f7f\u7528bind\u51fd\u6570<\/p>\n<pre class=\"post-pre\"><code>\r\n <span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span>\r\n   <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span><span class=\"p\">.<\/span><span class=\"nf\">bind<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">)<\/span>\r\n <span class=\"p\">}<\/span>\r\n\r\n <span class=\"nf\">hoge<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hoge<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n <span class=\"p\">}<\/span>\r\n \r\n <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">change<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u60a8\u4f7f\u7528plugin-proposal-class-properties\u63d2\u4ef6\uff0c\u60a8\u53ef\u4ee5\u5728\u7c7b\u5185\u7bad\u5934\u51fd\u6570\u4e2d\u8fdb\u884c\u5b9a\u4e49\u5e76\u6307\u5b9a\u3002<\/p>\n<pre class=\"post-pre\"><code>\r\n <span class=\"nx\">hoge<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hoge<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n <span class=\"p\">}<\/span>\r\n \r\n <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">change<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u5e26\u6709\u9ed8\u8ba4\u53c2\u6570\u7684\u60c5\u51b5\u4e0b\u5c06\u5176\u4f20\u9012\u7ed9props\u3002<\/h3>\n<p>\u5982\u679c\u503c\u5728\u8fc7\u7a0b\u4e2d\u53d1\u751f\u53d8\u5316\uff0cprops\u88ab\u89c6\u4e3a\u5df2\u66f4\u6539\uff0c\u5e76\u8c03\u7528\u5b50\u7ec4\u4ef6\u7684 render\u3002<\/p>\n<p>\u30fb\u4e0d\u53ef\u4ee5<\/p>\n<pre class=\"post-pre\"><code> <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">options<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">abc<\/span> <span class=\"o\">||<\/span> <span class=\"p\">[]<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>  \r\n<\/code><\/pre>\n<p>\u53ef\u4ee5\uff0c\u6211\u4eec\u5728\u6784\u9020\u51fd\u6570\u4e2d\u505a\u3002<\/p>\n<pre class=\"post-pre\"><code> <span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span>\r\n   <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">abc<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[]<\/span>\r\n <span class=\"p\">}<\/span>\r\n\r\n <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">options<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">abc<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>  \r\n<\/code><\/pre>\n<h3>\u5c06bind\u64cd\u4f5c\u5728render\u4e2d\u5b8c\u6210<\/h3>\n<p>\u2022 &#8220;\u4e0d\u884c&#8221; (B\u00f9<\/p>\n<pre class=\"post-pre\"><code> <span class=\"nf\">hoge<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hoge<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n <span class=\"p\">}<\/span>\r\n\r\n <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">change<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span><span class=\"p\">.<\/span><span class=\"nf\">bind<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">)<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u597d\u7684\uff0c\u6211\u4eec\u7528\u6784\u9020\u51fd\u6570\u6765\u505a\u5427\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span>\r\n   <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span><span class=\"p\">.<\/span><span class=\"nf\">bind<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">)<\/span>\r\n <span class=\"p\">}<\/span>\r\n\r\n <span class=\"nf\">hoge<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">hoge<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n <span class=\"p\">}<\/span>\r\n \r\n <span class=\"nf\">render <\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n   <span class=\"k\">return<\/span> <span class=\"p\">&lt;<\/span><span class=\"nc\">Child<\/span> <span class=\"na\">change<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">hoge<\/span><span class=\"si\">}<\/span> <span class=\"p\">\/&gt;<\/span>\r\n <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>SFC vs React.memo vs PureComponent \u7684\u6bd4\u8f83<\/h2>\n<p>\u5173\u4e8e\u65e0\u72b6\u6001\u7ec4\u4ef6\uff08Stateless Component\uff09\uff0c\u5c06\u5176\u6539\u4e3aSFC\u53ef\u4ee5\u907f\u514dReact\u4e2d\u4e0d\u5fc5\u8981\u7684\u751f\u547d\u5468\u671f\u5904\u7406\uff0c\u4ece\u800c\u63d0\u9ad8\u6e32\u67d3\u901f\u5ea6\u3002<br \/>\n\u53c2\u8003\uff1a\u300a\u73b0\u5728React\u529f\u80fd\u7ec4\u4ef6\u5feb\u4e8645%\u300b<br \/>\n\u2192 \u867d\u7136\u6807\u9898\u4e2d\u663e\u793a\u4e8645%\uff0c\u4f46\u636e\u6587\u7ae0\u5185\u7684\u56fe\u7247\u663e\u793a\uff0c\u5c06class\u7ec4\u4ef6\u8f6c\u6362\u4e3a\u51fd\u6570\u7ec4\u4ef6\u53ea\u80fd\u5e26\u67656%\u7684\u6027\u80fd\u63d0\u5347\u3002<\/p>\n<p>\u5728\u4f7f\u7528React.memo\u6216PureComponent\u65f6\uff0c\u9700\u8981\u8003\u8651HOC\u6216\u751f\u547d\u5468\u671f\u65b9\u6cd5\u7684\u6027\u80fd\u5f00\u9500\uff0c\u56e0\u6b64\u5bf9\u4e8e\u53ea\u5305\u542b\u8f83\u5c0f\u89c4\u6a21DOM\u7684\u7ec4\u4ef6\u800c\u8a00\uff0cReact.memo\u6216PureComponent\u53ef\u80fd\u8fc7\u4e8e\u590d\u6742\uff0c\u53cd\u800c\u4f1a\u964d\u4f4e\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5728\u8003\u8651\u5230\u9700\u8981\u6e32\u67d3\u7684DOM\u6570\u91cf\u548c\u5176\u4ed6\u8981\u7d20\u4e4b\u95f4\u9700\u8981\u6743\u8861\u53d6\u820d\u65f6\uff0c\u9700\u8981\u8003\u8651\u5728\u4f55\u79cd\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002<br \/>\n\u5728\u5b9e\u9645\u60c5\u51b5\u4e0b\uff0c\u65e0\u6cd5\u786e\u5b9a\u6743\u8861\u53d6\u820d\u7684\u5177\u4f53\u70b9\uff0c\u76f4\u5230\u8fdb\u884c\u5b9e\u9645\u7684\u6d4b\u91cf\u4e3a\u6b62\u3002<br \/>\n\u5bf9\u4e8eReact.memo\u6765\u8bf4\uff0c\u53ea\u6709\u5728props\u5185\u5bb9\u4e0d\u53d1\u751f\u53d8\u5316\uff08\u5373\u6e32\u67d3\u5185\u5bb9\u4ece\u521d\u59cb\u72b6\u6001\u5f00\u59cb\u4e0d\u53d1\u751f\u53d8\u5316\uff09\u7684\u60c5\u51b5\u4e0b\u624d\u9002\u5408\u4f7f\u7528\u3002<\/p>\n<p>\u540c\u65f6\uff0c\u5728React 16.8\u5f15\u5165\u7684React Hooks\u4e2d\uff0c\u4f7f\u7528useState\u53ef\u4ee5\u4f7f\u51fd\u6570\u5f0f\u7ec4\u4ef6\u4e5f\u62e5\u6709\u72b6\u6001\u3002(\u4ee5\u4e0b\u7b80\u79f0FC)<br \/>\nReact 16.8: \u5bf9\u6700\u7ec8\u7248\u672c\u7684React Hooks\u8fdb\u884c\u8be6\u7ec6\u4ecb\u7ecd<br \/>\n\u6b64\u5916\uff0c\u901a\u8fc7\u4f7f\u7528useMemo\u548cuseCallback\uff0c\u53ef\u4ee5\u5728\u51fd\u6570\u5f0f\u7ec4\u4ef6\u4e2d\u91cd\u7528\u53d8\u91cf\u548c\u51fd\u6570\uff0c\u800c\u65e0\u9700\u91cd\u65b0\u751f\u6210\uff0c\u56e0\u6b64\u6027\u80fd\u53ef\u80fd\u66f4\u597d\u3002<br \/>\n\u968f\u610f\u4f7f\u7528React Hooks\u7684useCallback\/useMemo\u53ef\u80fd\u4f1a\u964d\u4f4e\u53ef\u8bfb\u6027\uff0c\u5e76\u589e\u52a0\u9519\u8bef\u7684\u53ef\u80fd\u6027\uff0c\u56e0\u6b64\u5728\u9002\u5f53\u7684\u573a\u5408\u4f7f\u7528\u4f1a\u66f4\u597d\u3002<\/p>\n<p>\u5728\u4f7f\u7528`useMemo`\u4e4b\u524d\uff0c\u66f4\u597d\u7684\u505a\u6cd5\u4f3c\u4e4e\u662f\u4f18\u5148\u5220\u9664\u65e0\u7528\u7684`div`\uff0c\u800c\u4e0d\u662f\u52aa\u529b\u4f7f\u7528`useMemo`\u3002<br \/>\n\u53c2\u8003\uff1a\u5728\u62c5\u5fc3`useMemo`\u7684\u6210\u672c\u4e4b\u524d\uff0c\u5148\u51cf\u5c11\u591a\u4f59\u7684`div`\uff01<\/p>\n<p>\u901a\u8fc7\u4f7f\u7528 React.Fragment \u6216\u91cd\u65b0\u5ba1\u67e5\u6837\u5f0f\uff0c\u4e3b\u8981\u662f\u6837\u5f0f\u4e0d\u5fc5\u8981\u7684 div \u5c06\u51cf\u5c11\u3002<\/p>\n<pre class=\"post-pre\"><code>\/\/ \u7121\u99c4\u306a\u4f8b\r\n<span class=\"nt\">&lt;div<\/span> <span class=\"na\">style=<\/span><span class=\"s\">{{display:<\/span> <span class=\"err\">'<\/span><span class=\"na\">flex<\/span><span class=\"err\">',<\/span> <span class=\"na\">justifyContent:<\/span> <span class=\"err\">'<\/span><span class=\"na\">center<\/span><span class=\"err\">',<\/span> <span class=\"na\">alignItems:<\/span> <span class=\"err\">'<\/span><span class=\"na\">center<\/span><span class=\"err\">'}}<\/span><span class=\"nt\">&gt;<\/span>\r\n  <span class=\"nt\">&lt;div&gt;<\/span>\r\n   \u30b3\u30f3\u30c6\u30f3\u30c4\r\n  <span class=\"nt\">&lt;\/div&gt;<\/span>\r\n<span class=\"nt\">&lt;\/div&gt;<\/span>\r\n\r\n\/\/ \u7121\u99c4\u304c\u5c11\u306a\u3044\u4f8b\r\n<span class=\"nt\">&lt;div<\/span> <span class=\"na\">style=<\/span><span class=\"s\">{{margin:<\/span> <span class=\"err\">'<\/span><span class=\"na\">auto<\/span><span class=\"err\">'}}<\/span><span class=\"nt\">&gt;<\/span>\r\n \u30b3\u30f3\u30c6\u30f3\u30c4\r\n<span class=\"nt\">&lt;\/div&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u987a\u4fbf\u8bf4\u4e00\u53e5\uff0c\u5728\u6837\u5f0f\u65b9\u9762\uff0c\u5c3d\u91cf\u51cf\u5c11\u4f7f\u7528div\uff0c\u4ec5\u4ec5\u4f7f\u7528CSS\u9009\u62e9\u5668\u5e76\u4e0d\u80fd\u4f7f\u7f51\u7ad9\u52a0\u8f7d\u901f\u5ea6\u53d8\u5feb\uff0c\u8fd9\u662f\u4e00\u4e2a\u6bd4\u8f83\u56f0\u96be\u7684\u5730\u65b9\u5c31\u662f&#8230; \u53c2\u8003\uff1a\u8003\u8651\u7f51\u9875\u52a0\u8f7d\u901f\u5ea6\u7684CSS\u9009\u62e9\u5668\u5199\u6cd5\u3002<\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u53cd\u6a21\u5f0f\uff0c\u6211\u4eec\u5c06\u5c3d\u91cf\u5c06\u5177\u6709\u72b6\u6001\u7684\u7ec4\u4ef6\u9650\u5b9a\u5728\u672b\u7aef\u7ec4\u4ef6\u4e2d\uff0c\u5e76\u5728\u9875\u9762\u4e0a\u53ea\u4fdd\u7559\u9875\u9762\u7ea7\u522b\u7684\u72b6\u6001\u3002<br \/>\n\u5bf9\u4e8e\u9700\u8981\u5f15\u7528\u6570\u636e\u7684\u7ec4\u4ef6\uff0c\u6211\u4eec\u5c06\u4f7f\u7528connect\u76f4\u63a5\u5f15\u7528\u6570\u636e\u3002\uff08\u5305\u62ec\u53ef\u4ee5\u5728\u9875\u9762\u5185\u66f4\u65b0\u7684\u6570\u636e\uff09<br \/>\n\u6211\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u4e3aFC\u7ec4\u4ef6\u7ec4\u5408React.memo\u7684\u7236\u7ec4\u4ef6\u53ef\u4ee5\u9650\u5236\u6e32\u67d3\u7684\u5f71\u54cd\u8303\u56f4\uff0c\u8fd9\u79cd\u7c92\u5ea6\u53ef\u4ee5\u7c7b\u6bd4\u4e3aAtomic Design\u4e2d\u7684Organisms\uff08\u6709\u673a\u4f53\uff09\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/85-0.png\" alt=\"68747470733a2f2f71696974612d696d6167652d73746f72652e73332e616d617a6f6e6177732e636f6d2f302f35353037372f36613935613461372d336537332d336165302d633866342d3261356261376639653964362e706e67.png\" \/><\/div>\n<p>\u539f\u5b50\uff1a\u8bbe\u8ba1\u7684\u6700\u5c0f\u8981\u7d20\uff0c\u989c\u8272\uff0c\u5b57\u4f53\uff0c\u6807\u9898\uff0c\u6309\u94ae\uff0c\u8f93\u5165\u6846\u7b49\u3002<br \/>\n\u5206\u5b50\uff1a\u901a\u8fc7\u7ec4\u5408\u539f\u5b50\u8fdb\u884c\u5206\u7ec4\u7684\u6a21\u5f0f\uff08\u4f8b\u5982\u6807\u9898\u548c\u6b63\u6587\u7684\u7ec4\u5408\uff09\u3002<br \/>\n\u6709\u673a\u4f53\uff1a\u901a\u8fc7\u7ec4\u5408\u5206\u5b50\u521b\u5efa\u7684\u754c\u9762\uff08\u4f8b\u5982\u6807\u9898+\u83dc\u5355\u680f\u2192\u5bfc\u822a\u680f\uff09\u3002<br \/>\n\u6a21\u677f\uff1a\u7531\u6709\u673a\u4f53\u7ec4\u5408\u800c\u6210\u7684\u9875\u9762\u7ebf\u6846\u3002<br \/>\n\u9875\u9762\uff1a\u5305\u542b\u9875\u9762\u72ec\u6709\u8bbe\u8ba1\u5143\u7d20\u7684\u7ebf\u6846\u4e4b\u5916\u7684\u9875\u9762\u672c\u8eab\u3002<\/p>\n<h3>\u6700\u540e\u53ea\u8981\u5168\u90e8\u6362\u6210FC\u5c31\u884c\u5417\uff1f<\/h3>\n<p>React Hooks-\u6bd4\u9ad8\u9636\u7ec4\u4ef6\uff08HOC\uff09\u6162\u5417\uff1f\u6d4b\u8bd5\u7ed3\u679c\u663e\u793a\uff0c\u5e26\u6709useEffect\u7684\u51fd\u6570\u7ec4\u4ef6\uff08FC\uff09\u548cHOC\u8fdb\u884c\u4e86\u57fa\u51c6\u6d4b\u8bd5\uff0c\u7ed3\u679c\u53d1\u73b0HOC\u66f4\u5feb\u3002<\/p>\n<p>\u8fd9\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u786e\u5b9e\u6709\u7f3a\u9677\u3002<br \/>\n\u636e\u8bf4componentDidMount\u6bd4useEffect\u66f4\u65e9\u56de\u8c03\uff0c\u4f46\u5728\u56de\u8c03\u65f6\u7528\u6237\u5b9e\u9645\u4e0a\u770b\u4e0d\u5230\u4efb\u4f55\u4e1c\u897f\u3002<br \/>\n\u6839\u636e\u4f7f\u7528useLayoutEffect\u8fdb\u884c\u6bd4\u8f83\u7684\u7ed3\u679c\uff0cHooks\u4f3c\u4e4e\u66f4\u5177\u4f18\u52bf\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u5e76\u4e0d\u80fd\u7b3c\u7edf\u5730\u8bf4Hooks\u5c31\u4e00\u5b9a\u66f4\u5feb\u3002<br \/>\n\uff08\u5c3d\u7ba1\u5982\u6b64\uff0c\u7531\u4e8e\u4f7f\u7528\u81ea\u5b9a\u4e49Hooks\u53ef\u4ee5\u5c06\u903b\u8f91\u5904\u7406\u548cUI\u663e\u793a\u5206\u79bb\uff0c\u76ee\u524d\u6765\u8bf4\u4f7f\u7528Hooks\u7684\u597d\u5904\u66f4\u5927\u3002\uff09<\/p>\n<h2>\u51cf\u8f7b\u9891\u7e41\u7ec4\u4ef6\u91cd\u65b0\u6e32\u67d3\u7684\u8d1f\u62c5<\/h2>\n<p>\u4f7f\u7528CSS\u6765\u52a0\u5febReact\u5e94\u7528\u7684\u901f\u5ea6<\/p>\n<p>\u5f53\u7ec4\u4ef6\u4e2d\u5b58\u5728\u9891\u7e41\u6e32\u67d3\u6216\u8005\u6e32\u67d3\u7c92\u5ea6\u8f83\u5927\u7684\u903b\u8f91\uff08\u5982useEffect\uff09\uff0c\u5c06\u5176\u5206\u79bb\u5230\u65e0\u903b\u8f91\u7684\u7ec4\u4ef6\u4e2d\u4f7f\u7528\u662f\u6709\u6548\u7684\u3002<\/p>\n<h2>\u68c0\u6d4b\u5230\u65e0\u6548\u6e32\u67d3<\/h2>\n<p>\u5f53\u4f60\u4f7f\u7528why-did-you-update\u5305\u65f6\uff0c\u4f60\u53ef\u4ee5\u5728\u5c5e\u6027\u6216\u72b6\u6001\u4f20\u9012\u7ed9\u5b50\u7ec4\u4ef6\u7684\u65f6\u5019\u68c0\u6d4b\u5230\u4e0d\u5fc5\u8981\u7684\u6e32\u67d3\uff08\u7528\u4e8e\u8c03\u8bd5\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u7121\u99c4\u306a\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u691c\u77e5\u3059\u308b<\/span>\r\n<span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"nx\">process<\/span><span class=\"p\">.<\/span><span class=\"nx\">env<\/span><span class=\"p\">.<\/span><span class=\"nx\">NODE_ENV<\/span> <span class=\"o\">!==<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">production<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span><span class=\"nx\">whyDidYouUpdate<\/span><span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">why-did-you-update<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"nf\">whyDidYouUpdate<\/span><span class=\"p\">(<\/span><span class=\"nx\">React<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/96-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2018-12-06 19.03.35.png\" \/><\/div>\n<h2>\u6837\u672c<\/h2>\n<p>\u6211\u5199\u4e86\u4e00\u4e2a\u5173\u4e8e\u5728StackBlitz\u4e0a\u8c03\u7528\u5448\u73b0\u6bd4\u8f83\u7684\u6d4b\u8bd5\uff0c\u53ef\u4ee5\u770b\u5230\u5b83\u7684\u884c\u4e3a\u3002 \u8bf7\u5c1d\u8bd5\u6253\u5f00\u63a7\u5236\u53f0\u4ee5\u786e\u8ba4\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/99-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2018-12-01 22.57.52.png\" \/><\/div>\n<h1>\u4f7f\u7528\u4ee3\u7801\u5206\u5272\u548c\u52a8\u6001\u5bfc\u5165\u6765\u52a0\u901f\u52a0\u8f7d\u3002<\/h1>\n<p>\u4f7f\u7528\u4ee3\u7801\u5206\u5272\u529f\u80fd\u53ef\u4ee5\u5728\u6784\u5efa\u65f6\u5c06\u6307\u5b9a\u7684\u7ec4\u4ef6\u4ecebundle.js\u4e2d\u62c6\u5206\u5230\u53e6\u4e00\u4e2aJS\u6587\u4ef6\u4e2d\u3002<\/p>\n<p>\u5728Webpack\u4e2d\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7Webpack\u7684\u4f18\u5316\u9009\u9879\u5c06\u4e3b\u8981\u5e93\u5206\u79bb\u5230\u5355\u72ec\u7684\u6587\u4ef6\u4e2d\u3002webpack\u7684\u4ee3\u7801\u62c6\u5206\u529f\u80fd\u3002<\/p>\n<p>\u4ee5\u4e0b\u7684\u4f8b\u5b50\u5c55\u793a\u4e86\u5c06\u4e00\u4e2a\u540d\u4e3abundle.js\u7684\u6587\u4ef6\u5206\u6210react.js\u6587\u4ef6\u3001core.js\u6587\u4ef6\u548cbundle.js\u6587\u4ef6\u8fd9\u4e09\u4e2a\u6587\u4ef6\u7684\u8fc7\u7a0b\u3002<br \/>\n\uff08\u4e0e\u52a0\u8f7d\u4e00\u4e2a\u5e9e\u5927\u7684bundle.js\u76f8\u6bd4\uff0c\u540c\u65f6\u52a0\u8f7d\u591a\u4e2a\u5927\u5c0f\u76f8\u540c\u7684js\u6587\u4ef6\u53ef\u4ee5\u52a0\u5feb\u52a0\u8f7d\u901f\u5ea6\uff09<br \/>\n\u4e0ereact\u76f8\u5173\u7684\u5305\u88ab\u5206\u79bb\u5230react.js\u6587\u4ef6\u4e2d\uff0c\u800c\u5176\u4ed6\u4f53\u79ef\u8f83\u5927\u7684\u5e93\u5219\u88ab\u5206\u79bb\u5230core.js\u6587\u4ef6\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Visualizer<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">webpack-visualizer-plugin<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">mode<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">production<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ \u672c\u756a\u74b0\u5883<\/span>\r\n  <span class=\"na\">optimization<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">splitChunks<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"na\">cacheGroups<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">react<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"na\">test<\/span><span class=\"p\">:<\/span> <span class=\"sr\">\/react\/<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"na\">chunks<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">all<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n        <span class=\"na\">core<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n          <span class=\"na\">test<\/span><span class=\"p\">:<\/span> <span class=\"sr\">\/redux|core-js|jss|history|matarial-ui|lodash|moment|rollbar|<\/span><span class=\"se\">\\.<\/span><span class=\"sr\">io|platform|axios\/<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">core<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"na\">chunks<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">all<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">},<\/span>\r\n      <span class=\"p\">},<\/span>\r\n    <span class=\"p\">},<\/span>\r\n  <span class=\"p\">},<\/span>\r\n  <span class=\"na\">plugins<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"k\">new<\/span> <span class=\"nc\">Visualizer<\/span><span class=\"p\">({<\/span><span class=\"na\">filename<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/stats.html<\/span><span class=\"dl\">'<\/span><span class=\"p\">})<\/span>\r\n  <span class=\"p\">],<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4f7f\u7528webpack-visualizer-plugin\u63d2\u4ef6\u53ef\u4ee5\u5c06\u751f\u6210\u7684js\u6587\u4ef6\u7684\u5927\u5c0f\u5206\u5e03\u53ef\u89c6\u5316\uff08\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u662f\u8f93\u51fastats.html\uff09\u3002<br \/>\n\u6bcb\u5eb8\u7f6e\u7591\u5730\uff0c\u5e94\u8be5\u4ece\u5305\u4e2d\u6392\u9664\u672a\u4f7f\u7528\u7684\u5e93\u3002\u6216\u8005\uff0c\u9700\u8981\u6ce8\u610f\u8fc7\u5927\u7684\u5305\uff0c\u4ee5\u514dbundle.js\u7684\u5927\u5c0f\u81a8\u80c0\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/106-0.png\" alt=\"5b284d60-71da-11e5-8d35-7d1d4c58843a.png\" \/><\/div>\n<p>\u6700\u8fd1\uff0c\u5728\u4f7f\u7528webpack-bundle-analyzer\u63d2\u4ef6\u65f6\u80fd\u591f\u66f4\u8be6\u7ec6\u5730\u663e\u793a\u7ec6\u5206\u7ec4\u4ef6\uff0c\u6240\u4ee5\u6211\u5b8c\u5168\u4f7f\u7528\u8fd9\u4e2a\u63d2\u4ef6\u3002<br \/>\n\u53ea\u9700\u8981\u5c06\u914d\u7f6e\u6dfb\u52a0\u5230\u63d2\u4ef6\u5373\u53ef\u3002<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"nx\">plugins<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"k\">new<\/span> <span class=\"nc\">BundleAnalyzerPlugin<\/span><span class=\"p\">()<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d325837434c4406c61bfd\/109-0.gif\" alt=\"93f72404-b338-11e6-92d4-9a365550a701.gif\" \/><\/div>\n<p>\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e00\u79cd\u79f0\u4e3a\u52a8\u6001\u5bfc\u5165\u7684\u6280\u672f\u6765\u5f02\u6b65\u52a0\u8f7dJS\u6587\u4ef6\u3002\u8fd9\u6837\u53ef\u4ee5\u7f29\u77ed\u7531\u4e8e\u540c\u6b65\u52a0\u8f7d\u800c\u88ab\u963b\u585e\u7684\u65f6\u95f4\u3002\uff08\u203b\u7136\u800c\uff0c\u5728\u8fdb\u884cSSR\u65f6\uff0c\u5b58\u5728\u9875\u9762\u7ec4\u4ef6\u4e0e\u540c\u6b65\u52a0\u8f7d\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002\uff09\u4e3a\u6b64\uff0c\u6211\u5236\u4f5c\u4e86\u4e00\u4e2a\u5173\u4e8e\u4ec5\u5bf9\u7740\u9646\u9875\u8fdb\u884c\u540c\u6b65\u52a0\u8f7d\u7684\u793a\u4f8b\u3002\u5173\u4e8eSSR\uff08\u670d\u52a1\u5668\u7aef\u6e32\u67d3\uff09\u7684\u5185\u5bb9\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u540c\u671f<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">Sample<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/Sample<\/span><span class=\"dl\">'<\/span>\r\n<span class=\"c1\">\/\/ \u975e\u540c\u671f<\/span>\r\n<span class=\"k\">import<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">.\/Sample<\/span><span class=\"dl\">'<\/span><span class=\"p\">).<\/span><span class=\"nf\">then<\/span><span class=\"p\">(<\/span><span class=\"nx\">module<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"k\">default<\/span><span class=\"p\">).<\/span><span class=\"nf\">then<\/span><span class=\"p\">(<\/span><span class=\"nx\">Sample<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span><span class=\"cm\">\/*\u51e6\u7406*\/<\/span><span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<p>\u53e6\u5916\uff0c\u5728\u4f7f\u7528webpack\u8fdb\u884c\u6784\u5efa\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u7ed9\u5bfc\u5165\u6587\u4ef6\u6dfb\u52a0\u4e00\u4e2a\u540d\u4e3awebpackChunkName\u7684\u9b54\u672f\u6ce8\u91ca\u6765\u5c06\u5bfc\u5165\u7684\u6587\u4ef6\u4ecebundle.js\u4e2d\u5206\u79bb\u51fa\u6765\u3002<br \/>\n\u4e0b\u9762\u7684\u793a\u4f8b\u662f\u5c06Sample\u7ec4\u4ef6\u5206\u79bb\u5230sample.js\u4e2d\u7684\u793a\u4f8b\uff08webpackChunkName\u9700\u8981\u6307\u5b9a\u6587\u4ef6\u540d\uff0c\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span><span class=\"p\">(<\/span><span class=\"cm\">\/* webpackChunkName: \"sample\" *\/<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/Sample<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u81ea webpack 4.6.0 \u7248\u672c\u4ee5\u540e\uff0c\u8fd8\u53ef\u4ee5\u6dfb\u52a0\u9884\u53d6(prefetch)\u529f\u80fd\u3002<br \/>\n\u901a\u8fc7\u7ed9 webpackPrefetch \u6dfb\u52a0\u9b54\u672f\u6ce8\u91ca\uff0c\u53ef\u4ee5\u5728\u7a7a\u95f2\u65f6\u95f4\u4e2d\u9884\u5148\u83b7\u53d6 js \u8d44\u6e90\u6587\u4ef6\u3002<br \/>\n\u60a8\u4e5f\u53ef\u4ee5\u901a\u8fc7\u7c7b\u4f3c z-index \u7684\u6570\u503c\u6765\u6307\u5b9a\u52a0\u8f7d\u4f18\u5148\u7ea7\uff08\u5982\u679c\u8fd9\u6837\u505a\uff0c\u5219 true \u88ab\u5f53\u4f5c 0 \u5904\u7406\uff09\u3002<br \/>\n\u53c2\u8003\uff1awebpack \u4e2d\u7684 \u5bf9\u4e8e webpackPrefetch\uff0c\u7531\u4e8e\u5b83\u4f1a\u5f02\u6b65\u5730\u83b7\u53d6\u6307\u5b9a\u7684 js \u8d44\u6e90\u6587\u4ef6\uff0c<br \/>\n\u56e0\u6b64\u6700\u597d\u5c06\u5176\u9650\u5236\u5728\u9884\u8ba1\u4f1a\u5728\u4e0b\u4e00\u9875\u4e2d\u4f7f\u7528\u7684 Component \u4e0a\u3002\uff08\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u901a\u4fe1\uff09<br \/>\n\u8fd8\u6ca1\u6709\u7ecf\u8fc7\u9a8c\u8bc1\uff0c\u4e0d\u8fc7\u8fd8\u6709\u4e00\u4e9b\u50cf Guess.js \u8fd9\u6837\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7 GA \u7684\u8ddf\u8e2a\u6570\u636e\u7b49\u6765\u63a8\u6d4b\u7528\u6237\u53ef\u80fd\u4f1a\u8f6c\u5230\u54ea\u4e2a\u9875\u9762\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span><span class=\"p\">(<\/span><span class=\"cm\">\/* webpackPrefetch: true, webpackChunkName: \"sample\" *\/<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/Sample<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u867d\u7136\u73b0\u5728\u4e5f\u5df2\u7ecf\u5b9e\u73b0\u4e86React.lazy\u529f\u80fd\uff0c\u4f46\u7531\u4e8e\u5c1a\u672a\u652f\u6301\u670d\u52a1\u5668\u7aef\u6e32\u67d3\uff0c\u6240\u4ee5\u8fd8\u662f\u63a8\u8350\u4f7f\u7528loadable-components\u3002\uff08\u53ef\u4ee5\u5728\u9700\u8981\u65f6\u5f02\u6b65\u52a0\u8f7d\uff09<\/p>\n<p>\u4f7f\u7528\u65b9\u6cd5\u5927\u81f4\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">loadable<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">@loadable\/component<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Sample<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">loadable<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"k\">import<\/span><span class=\"p\">(<\/span><span class=\"cm\">\/* webpackChunkName: 'sample' *\/<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.\/Sample<\/span><span class=\"dl\">'<\/span><span class=\"p\">))<\/span>\r\n<\/code><\/pre>\n<p>\u5236\u4f5c\u4e00\u4e2a\u4e0eloadable\u529f\u80fd\u76f8\u5f53\u7684\u7b80\u6613\u7ec4\u4ef6\u7684\u65b9\u5f0f\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u9045\u5ef6\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u884c\u3046\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span>\r\n<span class=\"k\">export<\/span> <span class=\"k\">default <\/span><span class=\"p\">(<\/span><span class=\"nx\">loader<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n  <span class=\"kd\">class<\/span> <span class=\"nc\">AsyncComponent<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">React<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span>\r\n      <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span>\r\n      <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span> <span class=\"na\">Component<\/span><span class=\"p\">:<\/span> <span class=\"nx\">AsyncComponent<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"nf\">componentDidMount<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"c1\">\/\/ \u9045\u5ef6\u3057\u3066\u8aad\u307f\u8fbc\u307f\u5b8c\u4e86\u3055\u305b\u308b<\/span>\r\n      <span class=\"nf\">setTimeout<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nf\">setState<\/span><span class=\"p\">({<\/span><span class=\"na\">startProgress<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">}),<\/span> <span class=\"mi\">500<\/span><span class=\"p\">)<\/span>\r\n      <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">loader<\/span><span class=\"p\">()<\/span>\r\n          <span class=\"p\">.<\/span><span class=\"nf\">then<\/span><span class=\"p\">(<\/span><span class=\"nx\">module<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"k\">default<\/span><span class=\"p\">)<\/span> <span class=\"c1\">\/\/ export default\u3055\u308c\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span>\r\n          <span class=\"p\">.<\/span><span class=\"nf\">then<\/span><span class=\"p\">(<\/span><span class=\"nx\">Component<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"c1\">\/\/ \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3057\u305f\u3082\u306e\u306b\u5dee\u3057\u66ff\u3048<\/span>\r\n            <span class=\"nx\">AsyncComponent<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">Component<\/span>\r\n            <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nf\">setState<\/span><span class=\"p\">({<\/span> <span class=\"nx\">Component<\/span> <span class=\"p\">})<\/span>\r\n          <span class=\"p\">})<\/span>\r\n      <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"nf\">render<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"c1\">\/\/ Wrap\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"o\">&lt;<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">Component<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">props<\/span> <span class=\"p\">}<\/span> <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\r\n<\/span>      <span class=\"p\">}<\/span>\r\n\r\n      <span class=\"k\">if <\/span><span class=\"p\">(<\/span><span class=\"o\">!<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">startProgress<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"kc\">null<\/span>\r\n      <span class=\"p\">}<\/span>\r\n\r\n      <span class=\"c1\">\/\/ Loading\u4e2d\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/span>\r\n      <span class=\"k\">return<\/span> <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Now<\/span> <span class=\"nx\">Loading<\/span><span class=\"p\">...<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\r\n<\/span>    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5bf9\u4e8e\u7eb5\u5411\u8f83\u957f\u7684\u9875\u9762\uff0c\u9664\u4e86\u7b2c\u4e00\u89c6\u56fe\uff08First View\uff09\u4e4b\u5916\uff0c\u91c7\u7528\u5f02\u6b65\u5bfc\u5165\uff08\u975e\u540c\u6b65\u5bfc\u5165\uff09\u7684\u65b9\u5f0f\u53ef\u4ee5\u52a0\u5feb\u521d\u59cb\u6e32\u67d3\u901f\u5ea6\u3002<br \/>\n\uff08\u4f46\u662f\uff0c\u5bf9\u4e8e\u4ec5\u652f\u6301SSR\u7684\u9875\u9762\u6216AMP\u9875\u9762\uff0c\u53ea\u80fd\u5728\u670d\u52a1\u5668\u7aef\u5b8c\u6210\u5168\u90e8\u6e32\u67d3\u3002\uff09<\/p>\n<p>React\u7684code splitting\u7528\u7684\u5e93loadable-components\u975e\u5e38\u597d\uff0c\u5b83\u8fd8\u63d0\u4f9b\u4e86\u5728\u94fe\u63a5\u60ac\u505c\u65f6\u9884\u63d0\u53d6\u529f\u80fd\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6b64\u529f\u80fd\u8fdb\u4e00\u6b65\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684JS\u6587\u4ef6\u52a0\u8f7d\u3002\uff08\u76f4\u5230\u9700\u8981\u65f6\u518d\u52a0\u8f7d\uff09\u6211\u63a8\u8350\u5927\u5bb6\u4f7f\u7528loadable-components\u3002<\/p>\n<h1>\u5173\u4e8eSSR\uff08\u670d\u52a1\u5668\u7aef\u6e32\u67d3\uff09\u548cSSG\uff08\u9759\u6001\u7f51\u7ad9\u751f\u6210\uff09\u7684\u5185\u5bb9\u3002<\/h1>\n<p>\u5728\u8fc7\u53bb\uff0c\u6211\u4e00\u76f4\u8ba4\u4e3a\u670d\u52a1\u5668\u7aef\u6e32\u67d3\uff08SSR\uff09\u6bd4\u5ba2\u6237\u7aef\u7aef\u6e32\u67d3\uff08CSR\uff09\u66f4\u5feb\u3002\u4f46\u5b9e\u9645\u4e0a\uff0c\u8fd9\u53d6\u51b3\u4e8e\u670d\u52a1\u5668\u548c\u6d4f\u89c8\u5668\u7684\u6027\u80fd\u4ee5\u53ca\u7f51\u7edc\u8fde\u63a5\u72b6\u51b5\u3002\u6709\u8da3\u7684\u662f\uff0c\u6709\u65f6\u5019SSR\u7684\u603b\u52a0\u8f7d\u65f6\u95f4\u53ef\u80fd\u6bd4CSR\u66f4\u6162\u3002\uff08\u5f53\u7136\uff0c\u5728\u9996\u6b21\u89c6\u56fe\u4ea4\u4e92\u65b9\u9762\uff0cCSR\u53ef\u4ee5\u5728\u767d\u5c4f\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u90e8\u5206\u5c55\u793a\uff0c\u8fd9\u4f1a\u66f4\u597d\u3002\uff09\u670d\u52a1\u5668\u7aef\u6e32\u67d3\u7684\u597d\u5904\u5927\u4e8e\u5ba2\u6237\u7aef\u7aef\u6e32\u67d3\u3002<\/p>\n<p>\u636e\u8bf4\u8fd9\u662f\u7531\u4e8e\u9875\u9762\u7684 DOM \u5143\u7d20\u8f83\u591a\uff0c\u5728\u540e\u7aef\u6e32\u67d3\u65f6\u9700\u8981\u82b1\u8d39\u8f83\u957f\u7684\u65f6\u95f4\uff0c\u5bfc\u81f4 TTFB\uff08\u9996\u5b57\u8282\u5230\u8fbe\u65f6\u95f4\uff09\u53d8\u6162\u3002\uff08RenderDOMServer.renderToString \u7684\u8d1f\u8f7d\u8f83\u9ad8\uff09\u4f5c\u4e3a\u89e3\u51b3\u529e\u6cd5\uff0c\u53ef\u4ee5\u8003\u8651\uff1a<\/p>\n<p>\u30fb\u901a\u8fc7CDN\u7b49\u65b9\u5f0f\u5c06\u9875\u9762\u7f13\u5b58\u8d77\u6765<br 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