{"id":221,"date":"2026-07-31T09:51:37","date_gmt":"2026-07-31T01:51:37","guid":{"rendered":"https:\/\/yykcj.com\/?p=221"},"modified":"2026-07-31T09:51:37","modified_gmt":"2026-07-31T01:51:37","slug":"chrome-devtools-%e9%ab%98%e7%ba%a7%e8%b0%83%e8%af%95%e6%8a%80%e5%b7%a7%ef%bc%9a%e4%bb%8e%e5%85%a5%e9%97%a8%e5%88%b0%e7%b2%be%e9%80%9a-2","status":"publish","type":"post","link":"https:\/\/yykcj.com\/?p=221","title":{"rendered":"Chrome DevTools \u9ad8\u7ea7\u8c03\u8bd5\u6280\u5de7\uff1a\u4ece\u5165\u95e8\u5230\u7cbe\u901a"},"content":{"rendered":"

\u5f15\u8a00<\/h2>\n

\u4f5c\u4e3a\u524d\u7aef\u5f00\u53d1\u8005\uff0cChrome DevTools \u662f\u6211\u4eec\u6700\u5e38\u7528\u7684\u8c03\u8bd5\u5de5\u5177\u4e4b\u4e00\u3002\u7136\u800c\uff0c\u5927\u591a\u6570\u5f00\u53d1\u8005\u53ea\u4f7f\u7528\u4e86\u5b83\u7684\u57fa\u7840\u529f\u80fd\uff08\u5982\u67e5\u770b\u5143\u7d20\u3001\u63a7\u5236\u53f0\u8f93\u51fa\uff09\uff0c\u800c\u5ffd\u7565\u4e86\u5b83\u5f3a\u5927\u7684\u9ad8\u7ea7\u8c03\u8bd5\u80fd\u529b\u3002\u672c\u6587\u5c06\u5e26\u4f60\u63a2\u7d22 Chrome DevTools \u4e2d\u90a3\u4e9b\u9c9c\u4e3a\u4eba\u77e5\u4f46\u6781\u5176\u6709\u7528\u7684\u9ad8\u7ea7\u6280\u5de7\uff0c\u52a9\u4f60\u6210\u4e3a\u8c03\u8bd5\u5927\u5e08\u3002<\/p>\n

\u4e00\u3001\u6761\u4ef6\u65ad\u70b9\u4e0e\u65e5\u5fd7\u70b9<\/h2>\n

1. \u6761\u4ef6\u65ad\u70b9<\/h3>\n

\u5f53\u6211\u4eec\u9700\u8981\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\u6682\u505c\u4ee3\u7801\u6267\u884c\u65f6\uff0c\u6761\u4ef6\u65ad\u70b9\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ea\u60f3\u5728 count<\/code> \u5927\u4e8e 5 \u65f6\u6682\u505c\uff1a<\/p>\n

\nfor (let i = 0; i < 10; i++) {\n    console.log('\u5f53\u524d i \u7684\u503c\uff1a', i);\n}\n<\/code><\/pre>\n
\u5728 DevTools \u4e2d\uff0c\u53f3\u952e\u70b9\u51fb\u884c\u53f7\uff0c\u9009\u62e9\u201c\u6dfb\u52a0\u6761\u4ef6\u65ad\u70b9\u201d\uff0c\u7136\u540e\u8f93\u5165\u6761\u4ef6 i > 5<\/code>\u3002\u8fd9\u6837\uff0c\u53ea\u6709\u6ee1\u8db3\u6761\u4ef6\u65f6\u624d\u4f1a\u6682\u505c\u3002<\/p>\n
2. \u65e5\u5fd7\u70b9<\/h3>\n
\u65e5\u5fd7\u70b9\u53ef\u4ee5\u5728\u4e0d\u6682\u505c\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\u8f93\u51fa\u65e5\u5fd7\uff0c\u6bd4 console.log<\/code> \u66f4\u7075\u6d3b\uff0c\u4e14\u65e0\u9700\u4fee\u6539\u4ee3\u7801\u3002\u53f3\u952e\u70b9\u51fb\u884c\u53f7\uff0c\u9009\u62e9\u201c\u6dfb\u52a0\u65e5\u5fd7\u70b9\u201d\uff0c\u8f93\u5165\u8868\u8fbe\u5f0f\uff0c\u5982 \u53d8\u91cf x \u7684\u503c\u662f\uff1a${x}<\/code>\u3002\u65e5\u5fd7\u70b9\u4f1a\u5728\u6bcf\u6b21\u6267\u884c\u5230\u8be5\u884c\u65f6\u8f93\u51fa\uff0c\u4f46\u4e0d\u4f1a\u4e2d\u65ad\u7a0b\u5e8f\u3002<\/p>\n
\ud83d\udca1 \u63d0\u793a<\/strong>\uff1a\u65e5\u5fd7\u70b9\u7279\u522b\u9002\u5408\u5728\u5faa\u73af\u4e2d\u8c03\u8bd5\uff0c\u907f\u514d\u9891\u7e41\u6682\u505c\u3002<\/p>\n
\u4e8c\u3001\u4f7f\u7528 Source \u9762\u677f\u8fdb\u884c\u9ad8\u7ea7\u8c03\u8bd5<\/h2>\n
1. \u4f7f\u7528 Watch \u548c Scope \u9762\u677f<\/h3>\n
\u5728\u8c03\u8bd5\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 Watch \u9762\u677f\u6dfb\u52a0\u76d1\u89c6\u8868\u8fbe\u5f0f\uff0c\u5b9e\u65f6\u67e5\u770b\u53d8\u91cf\u53d8\u5316\u3002Scope \u9762\u677f\u5219\u663e\u793a\u5f53\u524d\u4f5c\u7528\u57df\u5185\u7684\u6240\u6709\u53d8\u91cf\uff0c\u65b9\u4fbf\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n
2. \u4f7f\u7528 Call Stack \u8ffd\u8e2a\u51fd\u6570\u8c03\u7528<\/h3>\n
\u5f53\u4ee3\u7801\u51fa\u73b0\u5f02\u5e38\u65f6\uff0cCall Stack \u9762\u677f\u4f1a\u663e\u793a\u51fd\u6570\u7684\u8c03\u7528\u94fe\uff0c\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\u6e90\u5934\u3002<\/p>\n
3. \u4f7f\u7528 Blackbox \u811a\u672c<\/h3>\n
\u5982\u679c\u67d0\u4e9b\u7b2c\u4e09\u65b9\u5e93\u7684\u4ee3\u7801\u5e72\u6270\u4e86\u8c03\u8bd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u6807\u8bb0\u4e3a Blackbox\uff0c\u8fd9\u6837\u5728\u5355\u6b65\u8c03\u8bd5\u65f6\uff0cDevTools \u4f1a\u81ea\u52a8\u8df3\u8fc7\u8fd9\u4e9b\u811a\u672c\u3002<\/p>\n
\u4e09\u3001\u6027\u80fd\u5206\u6790\uff1a\u627e\u51fa\u6027\u80fd\u74f6\u9888<\/h2>\n
1. \u4f7f\u7528 Performance \u9762\u677f<\/h3>\n
\u6027\u80fd\u95ee\u9898\u5f80\u5f80\u96be\u4ee5\u5b9a\u4f4d\u3002Performance \u9762\u677f\u53ef\u4ee5\u5f55\u5236\u9875\u9762\u8fd0\u884c\u65f6\u6027\u80fd\uff0c\u5e76\u751f\u6210\u706b\u7130\u56fe\u3002\u901a\u8fc7\u5206\u6790\uff0c\u6211\u4eec\u53ef\u4ee5\u627e\u51fa\u8017\u65f6\u7684\u51fd\u6570\u3002<\/p>\n
\n\/\/ \u4e00\u4e2a\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u7684\u51fd\u6570\nfunction expensiveOperation() {\n    let sum = 0;\n    for (let i = 0; i < 1000000; i++) {\n        sum += i;\n    }\n    return sum;\n}\n<\/code><\/pre>\n
\u5f55\u5236\u65f6\uff0c\u70b9\u51fb\u201c\u5f55\u5236\u201d\u6309\u94ae\uff0c\u7136\u540e\u89e6\u53d1\u9875\u9762\u64cd\u4f5c\uff0c\u6700\u540e\u505c\u6b62\u5f55\u5236\u3002\u5728\u706b\u7130\u56fe\u4e2d\uff0c\u5bbd\u5927\u7684\u5757\u901a\u5e38\u8868\u793a\u8017\u65f6\u957f\u7684\u51fd\u6570\u3002<\/p>\n
2. \u4f7f\u7528 Memory \u9762\u677f\u68c0\u6d4b\u5185\u5b58\u6cc4\u6f0f<\/h3>\n
\u5185\u5b58\u6cc4\u6f0f\u4f1a\u5bfc\u81f4\u9875\u9762\u5361\u987f\u3002Memory \u9762\u677f\u4e2d\u7684 Heap Snapshot \u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5206\u6790\u5185\u5b58\u5206\u914d\u60c5\u51b5\u3002<\/p>\n
    \n
  1. \u5728\u9875\u9762\u52a0\u8f7d\u540e\uff0c\u5f55\u5236\u4e00\u4e2a\u5806\u5feb\u7167\u3002<\/li>\n
  2. \u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\uff0c\u518d\u6b21\u5f55\u5236\u5feb\u7167\u3002<\/li>\n
  3. \u6bd4\u8f83\u4e24\u4e2a\u5feb\u7167\uff0c\u67e5\u770b\u65b0\u589e\u7684\u5185\u5b58\u5206\u914d\u3002<\/li>\n<\/ol>\n
    \u5982\u679c\u67d0\u4e9b\u5bf9\u8c61\u4e00\u76f4\u5b58\u5728\u4e14\u6570\u91cf\u589e\u957f\uff0c\u53ef\u80fd\u5c31\u662f\u5185\u5b58\u6cc4\u6f0f\u7684\u6839\u6e90\u3002<\/p>\n
    \u56db\u3001\u7f51\u7edc\u9762\u677f\u7684\u9ad8\u7ea7\u8fc7\u6ee4<\/h2>\n
    1. \u8fc7\u6ee4\u8bf7\u6c42<\/h3>\n
    \u7f51\u7edc\u9762\u677f\u652f\u6301\u6309\u7c7b\u578b\u3001\u72b6\u6001\u7801\u3001\u57df\u540d\u7b49\u8fc7\u6ee4\u8bf7\u6c42\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ea\u60f3\u67e5\u770b XHR \u8bf7\u6c42\uff0c\u53ef\u4ee5\u70b9\u51fb\u201cFetch\/XHR\u201d\u6309\u94ae\u3002<\/p>\n
    2. \u6a21\u62df\u6162\u901f\u7f51\u7edc<\/h3>\n
    \u5728 Network \u9762\u677f\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u7f51\u7edc\u8282\u6d41\uff0c\u6a21\u62df\u5f31\u7f51\u73af\u5883\uff0c\u6d4b\u8bd5\u5e94\u7528\u7684\u52a0\u8f7d\u6027\u80fd\u3002<\/p>\n
    3. \u590d\u5236\u8bf7\u6c42\u4e3a cURL<\/h3>\n
    \u53f3\u952e\u70b9\u51fb\u4e00\u4e2a\u8bf7\u6c42\uff0c\u9009\u62e9\u201cCopy as cURL\u201d\uff0c\u53ef\u4ee5\u590d\u5236\u8be5\u8bf7\u6c42\u7684 cURL \u547d\u4ee4\uff0c\u65b9\u4fbf\u5728\u7ec8\u7aef\u4e2d\u91cd\u73b0\u8bf7\u6c42\u3002<\/p>\n
    \u4e94\u3001\u5b9e\u6218\uff1a\u8c03\u8bd5\u4e00\u4e2a React \u5e94\u7528<\/h2>\n
    \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a React \u5e94\u7528\uff0c\u51fa\u73b0\u4e86\u4e00\u4e2a bug\uff1a\u67d0\u4e2a\u6309\u94ae\u70b9\u51fb\u540e\uff0c\u9875\u9762\u6ca1\u6709\u66f4\u65b0\u3002\u6211\u4eec\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9aa4\u8c03\u8bd5\uff1a<\/p>\n
      \n
    1. \u4f7f\u7528 React DevTools<\/strong>\uff1a\u5b89\u88c5 React DevTools \u6269\u5c55\uff0c\u67e5\u770b\u7ec4\u4ef6\u72b6\u6001\u548c props\u3002<\/li>\n
    2. \u8bbe\u7f6e\u65ad\u70b9<\/strong>\uff1a\u5728\u6309\u94ae\u7684\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\u8bbe\u7f6e\u65ad\u70b9\uff0c\u68c0\u67e5\u4e8b\u4ef6\u662f\u5426\u88ab\u89e6\u53d1\u3002<\/li>\n
    3. \u4f7f\u7528\u6761\u4ef6\u65ad\u70b9<\/strong>\uff1a\u5982\u679c\u4e8b\u4ef6\u89e6\u53d1\u4e86\u4f46\u72b6\u6001\u672a\u66f4\u65b0\uff0c\u53ef\u80fd\u662f\u72b6\u6001\u66f4\u65b0\u51fd\u6570\u6709\u95ee\u9898\u3002\u5728 setState<\/code> \u5904\u8bbe\u7f6e\u6761\u4ef6\u65ad\u70b9\uff0c\u68c0\u67e5\u53c2\u6570\u3002<\/li>\n
    4. \u67e5\u770b\u7f51\u7edc\u8bf7\u6c42<\/strong>\uff1a\u5982\u679c\u6309\u94ae\u89e6\u53d1\u4e86 API \u8bf7\u6c42\uff0c\u68c0\u67e5\u8bf7\u6c42\u662f\u5426\u6210\u529f\uff0c\u54cd\u5e94\u662f\u5426\u7b26\u5408\u9884\u671f\u3002<\/li>\n<\/ol>\n
      \u516d\u3001\u5e38\u89c1\u5751\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h2>\n
      \u5e38\u89c1\u5751<\/h3>\n