{"id":166312,"date":"2024-05-08T15:34:04","date_gmt":"2024-05-08T07:34:04","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/166312.html"},"modified":"2024-05-08T15:34:07","modified_gmt":"2024-05-08T07:34:07","slug":"javascript%e6%80%8e%e6%a0%b7%e6%89%8d%e8%83%bd%e5%ae%9e%e7%8e%b0%e9%87%8d%e8%bd%bd%e8%bf%90%e7%ae%97%e7%ac%a6%e7%9a%84%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/166312.html","title":{"rendered":"JavaScript\u600e\u6837\u624d\u80fd\u5b9e\u73b0\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u529f\u80fd"},"content":{"rendered":"

\"JavaScript\u600e\u6837\u624d\u80fd\u5b9e\u73b0\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u529f\u80fd\"<\/p>\n

\u5728JavaScript\u4e2d\u5b9e\u73b0\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u529f\u80fd\u4e3b\u8981\u4f9d\u8d56\u4e8e\u8bed\u8a00\u63d0\u4f9b\u7684\u9ad8\u7ea7\u7279\u6027\u548c\u4e00\u4e9b\u521b\u9020\u6027\u7684\u7f16\u7a0b\u6280\u5de7\u3002\u5177\u4f53\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528Proxy\u5bf9\u8c61\u3001\u5b9a\u4e49\u7279\u6b8a\u7684\u65b9\u6cd5\u6216\u5229\u7528\u7b2c\u4e09\u65b9\u5e93<\/strong>\u3002\u5176\u4e2d\uff0c\u4f7f\u7528Proxy\u5bf9\u8c61\u662f\u4e00\u79cd\u975e\u5e38\u76f4\u63a5\u4e14\u5f3a\u5927\u7684\u65b9\u5f0f\uff0c\u5b83\u5141\u8bb8\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u7684\u4ee3\u7406\uff0c\u4ece\u800c\u5728\u57fa\u672c\u64cd\u4f5c\uff08\u5982\u5c5e\u6027\u8bbf\u95ee\u3001\u8d4b\u503c\u3001\u679a\u4e3e\u7b49\uff09\u4e0a\u81ea\u5b9a\u4e49\u884c\u4e3a\u3002\u901a\u8fc7\u4ee3\u7406\uff0c\u6211\u4eec\u53ef\u4ee5\u62e6\u622a\u5e76\u91cd\u5b9a\u4e49\u64cd\u4f5c\u7b26\u7684\u884c\u4e3a\uff0c\u4e3a\u5b9e\u73b0\u8fd0\u7b97\u7b26\u91cd\u8f7d\u63d0\u4f9b\u53ef\u80fd\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528PROXY\u5bf9\u8c61\u5b9e\u73b0\u91cd\u8f7d<\/h2>\n<\/p>\n

Proxy\u5bf9\u8c61\u662fES6\u5f15\u5165\u7684\u4e00\u9879\u65b0\u7279\u6027\uff0c\u5b83\u5141\u8bb8\u4f60\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u7684\u4ee3\u7406\uff0c\u4ece\u800c\u5bf9\u57fa\u672c\u64cd\u4f5c\u8fdb\u884c\u62e6\u622a\u548c\u81ea\u5b9a\u4e49\u3002\u4f7f\u7528Proxy\u53ef\u4ee5\u62e6\u622a\u5bf9\u8c61\u7684\u8d4b\u503c\u3001\u5c5e\u6027\u8bbf\u95ee\u7b49\u64cd\u4f5c\uff0c\u8fdb\u800c\u5b9e\u73b0\u7c7b\u4f3c\u4e8e\u8fd0\u7b97\u7b26\u91cd\u8f7d\u7684\u6548\u679c\u3002<\/p>\n<\/p>\n

\u9996\u5148\uff0c\u521b\u5efaProxy\u5bf9\u8c61\u65f6\u9700\u8981\u63d0\u4f9b\u4e24\u4e2a\u53c2\u6570\uff1a\u76ee\u6807\u5bf9\u8c61\u548c\u5904\u7406\u7a0b\u5e8f\u5bf9\u8c61\u3002\u5904\u7406\u7a0b\u5e8f\u5bf9\u8c61\u662f\u4e00\u4e2a\u5b9a\u4e49\u4e86\u82e5\u5e72"\u9677\u9631"\u7684\u666e\u901a\u5bf9\u8c61\uff0c\u8fd9\u4e9b\u9677\u9631\u53ef\u4ee5\u62e6\u622a\u5bf9\u76ee\u6807\u5bf9\u8c61\u7684\u5404\u79cd\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

let target = {};<\/p>\n
let handler = {<\/p>\n
  get(target, propKey, receiver) {<\/p>\n
    \/\/ \u5b9a\u4e49\u5c5e\u6027\u8bbf\u95ee\u7684\u884c\u4e3a<\/p>\n
  },<\/p>\n
  set(target, propKey, value, receiver) {<\/p>\n
    \/\/ \u5b9a\u4e49\u5c5e\u6027\u8bbe\u7f6e\u7684\u884c\u4e3a<\/p>\n
  }<\/p>\n
  \/\/ \u53ef\u4ee5\u5b9a\u4e49\u66f4\u591a\u5176\u4ed6\u64cd\u4f5c\u7684\u9677\u9631<\/p>\n
};<\/p>\n
let proxy = new Proxy(target, handler);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5f53\u8bbf\u95ee\u6216\u4fee\u6539proxy\u5bf9\u8c61\u7684\u5c5e\u6027\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u901a\u8fc7handler\u5bf9\u8c61\u5b9a\u4e49\u7684\u884c\u4e3a\u6765\u5b9e\u73b0\u7684\u3002\u8fd9\u4e3a\u6a21\u62df\u8fd0\u7b97\u7b26\u91cd\u8f7d\u63d0\u4f9b\u4e86\u6781\u5927\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n
\u6bd4\u5982\u6211\u4eec\u8981\u5b9e\u73b0\u4e00\u4e2a\u5411\u91cf\u7c7bVector\uff0c\u5e76\u4e3a\u5176\u589e\u52a0\u52a0\u6cd5\u8fd0\u7b97\u7b26\u7684"\u91cd\u8f7d"\uff0c\u53ef\u4ee5\u901a\u8fc7Proxy\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
class Vector {<\/p>\n
  constructor(x, y) {<\/p>\n
    this.x = x;<\/p>\n
    this.y = y;<\/p>\n
  }<\/p>\n
  add(otherVector) {<\/p>\n
    return new Vector(this.x + otherVector.x, this.y + otherVector.y);<\/p>\n
  }<\/p>\n
}<\/p>\n
let handler = {<\/p>\n
  apply: function(target, thisArg, argumentsList) {<\/p>\n
    if(argumentsList.length == 1 && argumentsList[0] instanceof Vector) {<\/p>\n
      return target.add(argumentsList[0]);<\/p>\n
    }<\/p>\n
    return Reflect.apply(...arguments);<\/p>\n
  }<\/p>\n
}<\/p>\n
let vectorProxy = new Proxy(new Vector(1, 2), handler);<\/p>\n
let resultVector = vectorProxy.add(new Vector(2, 3)); \/\/ \u901a\u8fc7\u4ee3\u7406\u8c03\u7528add\u65b9\u6cd5<\/p>\n
console.log(resultVector); \/\/ \u8f93\u51fa Vector {x: 3, y: 5}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7Proxy\u548capply\u9677\u9631\u6355\u83b7\u4e86\u65b9\u6cd5\u8c03\u7528\uff0c\u5e76\u5728\u8c03\u7528add<\/code>\u65b9\u6cd5\u65f6\u8fdb\u884c\u4e86\u7279\u6b8a\u5904\u7406\uff0c\u6a21\u62df\u4e86\u52a0\u6cd5\u8fd0\u7b97\u7b26\u7684\u91cd\u8f7d\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5b9a\u4e49\u7279\u6b8a\u65b9\u6cd5\u5b9e\u73b0\u8fd0\u7b97\u7b26\u91cd\u8f7d\u7684\u6548\u679c<\/h2>\n<\/p>\n
\u867d\u7136JavaScript\u672c\u8eab\u4e0d\u76f4\u63a5\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u7279\u6b8a\u7684\u65b9\u6cd5\u6765\u95f4\u63a5\u5b9e\u73b0\u8fd9\u79cd\u6548\u679c<\/strong>\u3002\u8fd9\u79cd\u65b9\u6cd5\u8981\u6c42\u4ee3\u7801\u7684\u4f7f\u7528\u8005\u9075\u5faa\u4e00\u5b9a\u7684\u7ea6\u5b9a\uff0c\u6bd4\u5982\u4f7f\u7528add<\/code>\u4ee3\u66ff+<\/code>\u8fd0\u7b97\u7b26\u6765\u5b9e\u73b0\u52a0\u6cd5\u3002<\/p>\n<\/p>\n
class Complex {<\/p>\n
  constructor(real, imaginary) {<\/p>\n
    this.real = real;<\/p>\n
    this.imaginary = imaginary;<\/p>\n
  }<\/p>\n
  add(otherComplex) {<\/p>\n
    return new Complex(this.real + otherComplex.real, this.imaginary + otherComplex.imaginary);<\/p>\n
  }<\/p>\n
  \/\/ \u53ef\u4ee5\u7ee7\u7eed\u5b9e\u73b0\u5176\u4ed6\u8fd0\u7b97\u7b26\u7684"\u91cd\u8f7d"\u65b9\u6cd5\uff0c\u5982subtract\u3001multiply\u7b49<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u867d\u7136\u4e0d\u80fd\u76f4\u63a5\u901a\u8fc7\u8fd0\u7b97\u7b26\u8fdb\u884c\u64cd\u4f5c\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7\u660e\u786e\u7684\u65b9\u6cd5\u8c03\u7528\u6765\u6a21\u62df\u8fd0\u7b97\u7b26\u91cd\u8f7d\u7684\u6548\u679c\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u7b80\u5355\u6613\u61c2\uff0c\u7f3a\u70b9\u662f\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u8fd0\u7b97\u7b26\uff0c\u7f16\u7801\u4f53\u9a8c\u7565\u6709\u4e0d\u4fbf\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u5229\u7528\u7b2c\u4e09\u65b9\u5e93<\/h2>\n<\/p>\n
\u6709\u4e9b\u7b2c\u4e09\u65b9JavaScript\u5e93\u63d0\u4f9b\u4e86\u8fd0\u7b97\u7b26\u91cd\u8f7d\u7684\u529f\u80fd\u6216\u8005\u7c7b\u4f3c\u7684\u7279\u6027\u3002\u8fd9\u4e9b\u5e93\u901a\u5e38\u901a\u8fc7\u9884\u5904\u7406\u3001\u81ea\u5b9a\u4e49\u8bed\u6cd5\u89e3\u6790\u7b49\u6280\u672f\u6765\u5b9e\u73b0\uff0c\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u67d0\u79cd\u7a0b\u5ea6\u4e0a\u4f7f\u7528\u91cd\u8f7d\u8fc7\u7684\u8fd0\u7b97\u7b26\u3002<\/p>\n<\/p>\n
\u6bd4\u5982\uff0c\u4e00\u4e9b\u6570\u5b66\u8ba1\u7b97\u5e93\u53ef\u80fd\u63d0\u4f9b\u4e86\u9488\u5bf9\u7279\u5b9a\u5bf9\u8c61\u7c7b\u578b\u7684\u8fd0\u7b97\u7b26\u91cd\u8f7d\u80fd\u529b\uff0c\u4f7f\u5f97\u8fd9\u4e9b\u5bf9\u8c61\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u8fd0\u7b97\u7b26\u8fdb\u884c\u64cd\u4f5c\uff0c\u4ece\u800c\u4f7f\u4ee3\u7801\u66f4\u52a0\u76f4\u89c2\u548c\u5bcc\u6709\u8868\u73b0\u529b\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u7684\u4f18\u7f3a\u70b9\u5f88\u660e\u663e\u3002\u4f18\u70b9\u662f\u53ef\u4ee5\u5927\u5927\u7b80\u5316\u5f00\u53d1\u5de5\u4f5c\uff0c\u8ba9\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u548c\u6613\u4e8e\u7406\u89e3\uff1b\u7f3a\u70b9\u662f\u589e\u52a0\u4e86\u9879\u76ee\u7684\u4f9d\u8d56\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u9879\u76ee\u7684\u7a33\u5b9a\u6027\u548c\u957f\u671f\u7ef4\u62a4\u3002<\/p>\n<\/p>\n
\u7ed3\u8bba<\/h2>\n<\/p>\n
\u867d\u7136JavaScript\u4e0d\u76f4\u63a5\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\uff0c\u4f46\u901a\u8fc7\u521b\u9020\u6027\u7684\u7f16\u7a0b\u6280\u5de7\u548c\u5408\u7406\u5229\u7528\u8bed\u8a00\u7279\u6027\uff0c\u6211\u4eec\u4ecd\u7136\u53ef\u4ee5\u5b9e\u73b0\u7c7b\u4f3c\u7684\u6548\u679c\u3002\u65e0\u8bba\u662f\u4f7f\u7528Proxy\u5bf9\u8c61\u3001\u5b9a\u4e49\u7279\u6b8a\u7684\u65b9\u6cd5\u8fd8\u662f\u4f9d\u8d56\u7b2c\u4e09\u65b9\u5e93\uff0c\u5173\u952e\u5728\u4e8e\u6839\u636e\u9879\u76ee\u7684\u5177\u4f53\u9700\u6c42\u548c\u4f7f\u7528\u573a\u666f\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u6cd5\u3002\u7406\u89e3\u548c\u6743\u8861\u4e0d\u540c\u65b9\u6cd5\u7684\u4f18\u52a3\uff0c\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u66f4\u52a0\u7075\u6d3b\u548c\u6709\u6548\u5730\u7f16\u5199\u9ad8\u8d28\u91cf\u7684JavaScript\u4ee3\u7801\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u4ec0\u4e48\u662f\u91cd\u8f7d\u8fd0\u7b97\u7b26\uff1f<\/strong><\/p>\n
\u91cd\u8f7d\u8fd0\u7b97\u7b26\u662f\u6307\u5728\u4e0d\u540c\u7684\u4e0a\u4e0b\u6587\u4e2d\uff0c\u4e3a\u540c\u4e00\u4e2a\u64cd\u4f5c\u7b26\u8d4b\u4e88\u4e0d\u540c\u7684\u529f\u80fd\u3002\u5728JavaScript\u4e2d\uff0c\u5e76\u6ca1\u6709\u5185\u5efa\u7684\u652f\u6301\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u8bed\u6cd5\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e9b\u6280\u5de7\u6765\u6a21\u62df\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd\u3002<\/p>\n
2. \u5982\u4f55\u5b9e\u73b0\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u529f\u80fd\uff1f<\/strong><\/p>\n
\u5728JavaScript\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u51fd\u6570\u91cd\u8f7d\u7684\u65b9\u5f0f\u6765\u6a21\u62df\u5b9e\u73b0\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u529f\u80fd\u3002\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u63a5\u6536\u4e0d\u540c\u53c2\u6570\u7684\u51fd\u6570\uff0c\u6765\u5b9e\u73b0\u5bf9\u4e0d\u540c\u7c7b\u578b\u7684\u64cd\u4f5c\u6570\u8fdb\u884c\u4e0d\u540c\u7684\u5904\u7406\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528if\u8bed\u53e5\u6216switch\u8bed\u53e5\u6765\u6839\u636e\u64cd\u4f5c\u6570\u7684\u7c7b\u578b\u6267\u884c\u4e0d\u540c\u7684\u903b\u8f91\u3002<\/p>\n
3. \u6709\u4ec0\u4e48\u6ce8\u610f\u4e8b\u9879\u9700\u8981\u8003\u8651\uff1f<\/strong><\/p>\n
\u5728\u5b9e\u73b0\u91cd\u8f7d\u8fd0\u7b97\u7b26\u7684\u529f\u80fd\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n
    \n
  • \u9700\u8981\u6839\u636e\u4e0d\u540c\u7684\u64cd\u4f5c\u7b26\u8fdb\u884c\u4e0d\u540c\u7684\u5904\u7406\u3002<\/li>\n
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