{"id":169631,"date":"2024-05-08T16:50:07","date_gmt":"2024-05-08T08:50:07","guid":{"rendered":""},"modified":"2024-05-08T16:50:26","modified_gmt":"2024-05-08T08:50:26","slug":"javascript-%e6%8b%b7%e8%b4%9d%e7%9a%84%e6%b7%b1%e6%8b%b7%e8%b4%9d%e5%92%8c%e6%b5%85%e6%8b%b7%e8%b4%9d%e6%9c%89%e4%bb%80%e4%b9%88%e5%8c%ba%e5%88%ab-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/169631.html","title":{"rendered":"JavaScript \u62f7\u8d1d\u7684\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u6709\u4ec0\u4e48\u533a\u522b"},"content":{"rendered":"

\"JavaScript<\/p>\n

\u5728JavaScript\u4e2d\uff0c\u6df1\u62f7\u8d1d<\/strong>\u548c\u6d45\u62f7\u8d1d<\/strong>\u4e3b\u8981\u533a\u522b\u4f53\u73b0\u5728\u5bf9\u8c61\u7c7b\u578b\uff08\u5982\u6570\u7ec4\u3001\u5bf9\u8c61\u7b49\uff09\u7684\u590d\u5236\u65b9\u5f0f\u4e0a\u3002\u6d45\u62f7\u8d1d\u53ea\u590d\u5236\u4e00\u5c42\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u800c\u4e0d\u4f1a\u5bf9\u5bf9\u8c61\u5185\u90e8\u7684\u6df1\u5c42\u6b21\u5bf9\u8c61\u505a\u62f7\u8d1d<\/strong>\u3002\u56e0\u6b64\uff0c\u5982\u679c\u539f\u59cb\u5bf9\u8c61\u7684\u5c5e\u6027\u503c\u662f\u5bf9\u8c61\u6216\u6570\u7ec4\uff0c\u6d45\u62f7\u8d1d\u4f1a\u5bfc\u81f4\u62f7\u8d1d\u7684\u5bf9\u8c61\u548c\u539f\u59cb\u5bf9\u8c61\u7684\u76f8\u5e94\u503c\u6307\u5411\u540c\u4e00\u5757\u5185\u5b58\u5730\u5740\u3002\u76f8\u53cd\uff0c\u6df1\u62f7\u8d1d\u4f1a\u9012\u5f52\u590d\u5236\u6240\u6709\u5c42\u7ea7\u7684\u5c5e\u6027\uff0c\u751f\u6210\u4e00\u4efd\u5b8c\u5168\u72ec\u7acb\u7684\u526f\u672c<\/strong>\u3002\u5f53\u539f\u59cb\u5bf9\u8c61\u53d8\u5316\u65f6\uff0c\u6df1\u62f7\u8d1d\u4ea7\u751f\u7684\u5bf9\u8c61\u4e0d\u4f1a\u53d7\u5f71\u54cd\uff0c\u56e0\u4e3a\u5b83\u4eec\u5f15\u7528\u4e0d\u540c\u7684\u5730\u5740\u3002<\/p>\n<\/p>\n

\u5bf9\u4e8e\u6d45\u62f7\u8d1d\u7684\u5e94\u7528\u800c\u8a00\uff0cObject.assign()\u548c\u5c55\u5f00\u8fd0\u7b97\u7b26(…)\u662f\u4e24\u4e2a\u975e\u5e38\u5e38\u89c1\u7684\u4f8b\u5b50\u3002\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u53ea\u80fd\u590d\u5236\u5bf9\u8c61\u7684\u4e00\u5c42\u5c5e\u6027\uff0c\u8fdb\u4e00\u6b65\u7684\u5d4c\u5957\u5bf9\u8c61\u5219\u4e0d\u4f1a\u88ab\u9012\u5f52\u590d\u5236\u3002\u5728\u5b9e\u8df5\u4e2d\uff0c\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u4f1a\u5bfc\u81f4\u4e00\u4e2a\u95ee\u9898\uff1a\u5982\u679c\u539f\u5bf9\u8c61\u5185\u90e8\u5c5e\u6027\u4e5f\u662f\u5bf9\u8c61\uff0c\u90a3\u4e48\u8fd9\u4e9b\u5185\u90e8\u5bf9\u8c61\u7684\u5f15\u7528\u4e0d\u4f1a\u6539\u53d8\u3002\u76f8\u53cd\uff0c\u6df1\u62f7\u8d1d\u901a\u5e38\u9700\u8981\u81ea\u5b9a\u4e49\u51fd\u6570\u6216\u4f7f\u7528JSON.parse(JSON.stringify(object))\u7b49\u6280\u5de7\u5b9e\u73b0\u6240\u6709\u5c42\u6b21\u5c5e\u6027\u7684\u5b8c\u5168\u590d\u5236\u3002<\/p>\n<\/p>\n

\u4ee5\u4e0b\u6b63\u6587\u5185\u5bb9\uff0c\u6211\u4eec\u4f1a\u8be6\u7ec6\u63a2\u8ba8\u8fd9\u4e24\u79cd\u62f7\u8d1d\u65b9\u5f0f\u7684\u6982\u5ff5\u3001\u5b9e\u73b0\u65b9\u6cd5\u4ee5\u53ca\u5b83\u4eec\u7684\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u6d45\u62f7\u8d1d\u7684\u5b9e\u73b0\u65b9\u5f0f<\/h2>\n<\/p>\n

\u6d45\u62f7\u8d1d\u65b9\u6cd5\u7b80\u8ff0<\/h4>\n<\/p>\n

\u6d45\u62f7\u8d1d\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff0c\u5305\u62ec\u4f46\u4e0d\u9650\u4e8eObject.assign()\u3001\u5c55\u5f00\u8fd0\u7b97\u7b26(…)\u3001Array.prototype.slice()\u3001Array.prototype.concat()\u7b49\u3002<\/p>\n<\/p>\n

Object.assign()\u7684\u4f7f\u7528<\/h4>\n<\/p>\n

Object.assign(target, …sources)\u65b9\u6cd5\u53ef\u4ee5\u5c06\u6240\u6709\u53ef\u679a\u4e3e\u5c5e\u6027\u7684\u503c\u4ece\u4e00\u4e2a\u6216\u591a\u4e2a\u6e90\u5bf9\u8c61\u590d\u5236\u5230\u76ee\u6807\u5bf9\u8c61\u3002\u5b83\u4f1a\u8fd4\u56de\u76ee\u6807\u5bf9\u8c61\u3002\u8fd9\u79cd\u65b9\u6cd5\u662f\u57fa\u672c\u7684\u6d45\u62f7\u8d1d\u5b9e\u73b0\uff0c\u53ea\u4f1a\u62f7\u8d1d\u6e90\u5bf9\u8c61\u7684\u7b2c\u4e00\u5c42\u5c5e\u6027\u3002<\/p>\n<\/p>\n

let obj1 = { a: 1, b: { c: 2 } };<\/p>\n
let obj2 = Object.assign({}, obj1);<\/p>\n
obj1.a = 3;<\/p>\n
obj1.b.c = 4;<\/p>\n
console.log(obj2.a); \/\/ \u8f93\u51fa\uff1a1<\/p>\n
console.log(obj2.b.c); \/\/ \u8f93\u51fa\uff1a4<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4ece\u4ee5\u4e0a\u4ee3\u7801\u53ef\u4ee5\u770b\u5230\uff0c\u4fee\u6539obj1\u7684a\u5c5e\u6027\u5e76\u4e0d\u4f1a\u5f71\u54cd\u5230obj2\u7684a\u5c5e\u6027\uff0c\u4f46\u662f\u4fee\u6539obj1\u7684b\u5c5e\u6027\u4e2d\u7684c\u5c5e\u6027\u65f6\uff0cobj2\u7684c\u5c5e\u6027\u4e5f\u4f1a\u8ddf\u7740\u53d8\u5316\uff0c\u8bf4\u660e\u8fd9\u662f\u4e00\u79cd\u6d45\u5c42\u7684\u590d\u5236\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u6df1\u62f7\u8d1d\u7684\u5b9e\u73b0\u65b9\u5f0f<\/h2>\n<\/p>\n
\u6df1\u62f7\u8d1d\u65b9\u6cd5\u7b80\u8ff0<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u9012\u5f52\u51fd\u6570\u5b9e\u73b0\uff0c\u4e5f\u53ef\u4ee5\u5229\u7528JSON.parse\u548cJSON.stringify\u8fdb\u884c\u5b9e\u73b0\u3002\u4e0d\u8fc7\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u540e\u8005\u65e0\u6cd5\u590d\u5236\u51fd\u6570\u3001undefined\u6216\u5faa\u73af\u5f15\u7528\u3002<\/p>\n<\/p>\n
JSON\u65b9\u6cd5\u5b9e\u73b0\u6df1\u62f7\u8d1d<\/h4>\n<\/p>\n
\u4f7f\u7528JSON\u7684\u8f6c\u6362\u65b9\u6cd5\u5b9e\u73b0\u6df1\u62f7\u8d1d\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6280\u5de7\u3002\u5148\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3aJSON\u5b57\u7b26\u4e32\uff0c\u518d\u5c06\u6b64\u5b57\u7b26\u4e32\u89e3\u6790\u6210\u65b0\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
let obj1 = { a: 1, b: { c: 2 } };<\/p>\n
let obj2 = JSON.parse(JSON.stringify(obj1));<\/p>\n
obj1.a = 3;<\/p>\n
obj1.b.c = 4;<\/p>\n
console.log(obj2.a); \/\/ \u8f93\u51fa\uff1a1<\/p>\n
console.log(obj2.b.c); \/\/ \u8f93\u51fa\uff1a2<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cobj2\u662f\u5bf9obj1\u7684\u6df1\u62f7\u8d1d\uff0c\u5728\u53d8\u66f4obj1\u7684\u4efb\u610f\u5c5e\u6027\u540e\uff0cobj2\u7684\u5c5e\u6027\u90fd\u4fdd\u6301\u4e0d\u53d8\uff0c\u4ece\u800c\u8bc1\u660e\u4e86\u6df1\u62f7\u8d1d\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u6d45\u62f7\u8d1d\u4e0e\u6df1\u62f7\u8d1d\u7684\u573a\u666f\u5e94\u7528<\/h2>\n<\/p>\n
\u6d45\u62f7\u8d1d\u7684\u9002\u7528\u573a\u666f<\/h4>\n<\/p>\n
\u6d45\u62f7\u8d1d\u901a\u5e38\u9002\u7528\u4e8e\u90a3\u4e9b\u5bf9\u8c61\u7ed3\u6784\u7b80\u5355\u3001\u6ca1\u6709\u5d4c\u5957\u5bf9\u8c61\u6216\u5bf9\u539f\u59cb\u6570\u636e\u7ef4\u62a4\u6ca1\u6709\u4e25\u683c\u8981\u6c42\u7684\u573a\u666f<\/strong>\u3002\u6bd4\u5982\uff0c\u5f53\u4ec5\u4ec5\u9700\u8981\u590d\u5236\u5bf9\u8c61\u7684\u51e0\u4e2a\u57fa\u672c\u7c7b\u578b\u5c5e\u6027\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u6d45\u62f7\u8d1d\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u6df1\u62f7\u8d1d\u7684\u9002\u7528\u573a\u666f<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u9002\u5408\u590d\u6742\u5bf9\u8c61\u6216\u9700\u8981\u5b8c\u5168\u72ec\u7acb\u4e8e\u539f\u59cb\u6570\u636e\u7684\u573a\u5408<\/strong>\uff0c\u4f8b\u5982\u5728\u8fdb\u884c\u72b6\u6001\u7ba1\u7406\u3001\u907f\u514d\u5bf9\u8c61\u95f4\u7684\u5f71\u54cd\u6216\u5728\u51fd\u6570\u7f16\u7a0b\u4e2d\u907f\u514d\u526f\u4f5c\u7528\u65f6\u3002\u6df1\u62f7\u8d1d\u80fd\u591f\u786e\u4fdd\u6240\u505a\u7684\u4efb\u4f55\u4fee\u6539\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5230\u539f\u59cb\u5bf9\u8c61\uff0c\u8fd9\u5728\u5f88\u591a\u7f16\u7a0b\u95ee\u9898\u4e2d\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u7279\u6027\u3002<\/p>\n<\/p>\n
\u56db\u3001\u6ce8\u610f\u4e8b\u9879\u4e0e\u95ee\u9898\u89e3\u51b3<\/h2>\n<\/p>\n
\u6d45\u62f7\u8d1d\u7684\u9650\u5236<\/h4>\n<\/p>\n
\u7531\u4e8e\u6d45\u62f7\u8d1d\u53ea\u590d\u5236\u5bf9\u8c61\u7684\u7b2c\u4e00\u5c42\u5c5e\u6027\uff0c\u5f53\u6e90\u5bf9\u8c61\u7684\u5c5e\u6027\u662f\u53e6\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u8fd9\u5c06\u6210\u4e3a\u4e00\u4e2a\u6f5c\u5728\u7684\u95ee\u9898\u6e90\u3002\u540e\u7eed\u7684\u64cd\u4f5c\u80fd\u591f\u5f71\u54cd\u5230\u6240\u6709\u5171\u4eab\u5f15\u7528\u5bf9\u8c61\u7684\u72b6\u6001\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u96be\u4ee5\u8ffd\u8e2a\u7684bug\u3002<\/p>\n<\/p>\n
\u6df1\u62f7\u8d1d\u7684\u95ee\u9898\u5904\u7406<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u867d\u7136\u4fdd\u8bc1\u4e86\u6570\u636e\u7684\u72ec\u7acb\u6027\u548c\u5b89\u5168\u6027\uff0c\u4f46\u4e5f\u4e0d\u662f\u6ca1\u6709\u95ee\u9898\u3002\u4f8b\u5982\uff0cJSON\u65b9\u6cd5\u65e0\u6cd5\u590d\u5236\u51fd\u6570\u5c5e\u6027\u3001\u539f\u578b\u94fe\u4e0a\u7684\u5c5e\u6027\u548c\u5faa\u73af\u5f15\u7528\u7684\u5bf9\u8c61\u3002\u5bf9\u4e8e\u8fd9\u4e9b\u590d\u6742\u60c5\u51b5\uff0c\u901a\u5e38\u9700\u8981\u81ea\u5b9a\u4e49\u9012\u5f52\u62f7\u8d1d\u51fd\u6570\u6765\u5904\u7406\uff0c\u6216\u8005\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u6765\u5b9e\u73b0\u6df1\u62f7\u8d1d\uff0c\u5982lodash\u7684_.cloneDeep()<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u62f7\u8d1d\u6027\u80fd\u7684\u8003\u91cf<\/h2>\n<\/p>\n
\u6d45\u62f7\u8d1d\u7684\u6027\u80fd\u4f18\u52bf<\/h4>\n<\/p>\n
\u6d45\u62f7\u8d1d\u7531\u4e8e\u4ec5\u4ec5\u590d\u5236\u4e86\u7b2c\u4e00\u5c42\u5c5e\u6027\uff0c\u6240\u4ee5\u5728\u5904\u7406\u5927\u578b\u5bf9\u8c61\u6216\u6570\u7ec4\u65f6\uff0c\u4f1a\u6bd4\u6df1\u62f7\u8d1d\u66f4\u5feb\u66f4\u8282\u7701\u5185\u5b58\u3002\u5f53\u5bf9\u6027\u80fd\u6709\u8981\u6c42\uff0c\u800c\u53c8\u80fd\u786e\u8ba4\u4e0d\u4f1a\u4fee\u6539\u4efb\u4f55\u5d4c\u5957\u5bf9\u8c61\u65f6\uff0c\u6d45\u62f7\u8d1d\u662f\u66f4\u4f18\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n
\u6df1\u62f7\u8d1d\u7684\u6027\u80fd\u4ee3\u4ef7<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u9700\u8981\u590d\u5236\u5bf9\u8c61\u7684\u6240\u6709\u5c42\u7ea7\u5c5e\u6027\uff0c\u8fd9\u4f1a\u5360\u7528\u66f4\u591a\u7684\u5185\u5b58\u5e76\u4e14\u8017\u7528\u66f4\u591a\u7684\u5904\u7406\u65f6\u95f4\u3002\u5c24\u5176\u662f\u5f53\u5bf9\u8c61\u975e\u5e38\u5de8\u5927\u6216\u7ed3\u6784\u975e\u5e38\u590d\u6742\u65f6\uff0c\u6df1\u62f7\u8d1d\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/p>\n<\/p>\n
\u516d\u3001\u7ed3\u8bba\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h2>\n<\/p>\n
\u5728JavaScript\u7f16\u7a0b\u4e2d\uff0c\u7406\u89e3\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u7684\u533a\u522b\u53ca\u5176\u5bf9\u5e94\u7684\u9002\u7528\u573a\u666f\u662f\u5341\u5206\u91cd\u8981\u7684\u3002\u5f00\u53d1\u8005\u5e94\u5f53\u6839\u636e\u5177\u4f53\u7684\u9700\u8981\u9009\u62e9\u9002\u5408\u7684\u62f7\u8d1d\u65b9\u6cd5\uff0c\u540c\u65f6\u6ce8\u610f\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898\u548c\u6027\u80fd\u5f71\u54cd\u3002\u4f7f\u7528\u6d45\u62f7\u8d1d\u65f6\u8981\u7559\u5fc3\u4e0d\u53ef\u53d8\u6027\u7684\u7834\u574f\uff0c\u800c\u5728\u4f7f\u7528\u6df1\u62f7\u8d1d\u65f6\u53c8\u8981\u8003\u8651\u5230\u989d\u5916\u7684\u8d44\u6e90\u6d88\u8017\u3002\u5728\u5b9e\u8df5\u4e2d\uff0c\u5f80\u5f80\u9700\u8981\u6839\u636e\u5e94\u7528\u7684\u5177\u4f53\u573a\u666f\u6743\u8861\u4e24\u8005\u4e4b\u95f4\u7684\u5dee\u5f02\uff0c\u5408\u7406\u5b89\u6392\u4ee3\u7801\u4ee5\u83b7\u5f97\u6700\u4f73\u6027\u80fd\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u6709\u4ec0\u4e48\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u7528JavaScript\u8fdb\u884c\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\uff1f<\/strong><\/p>\n
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  1. \n
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  2. \n
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    \u4e3a\u4e86\u5b9e\u73b0\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n
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    • \n
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    • \n
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