{"id":160221,"date":"2024-05-08T13:26:33","date_gmt":"2024-05-08T05:26:33","guid":{"rendered":""},"modified":"2024-05-08T13:26:37","modified_gmt":"2024-05-08T05:26:37","slug":"%e8%83%bd%e4%b8%8d%e8%83%bd%e5%9c%a8%e4%b8%8d%e6%94%b9%e5%8f%98%e5%8e%9f-javascript-%e5%87%bd%e6%95%b0%e7%9a%84%e6%83%85%e5%86%b5%e4%b8%8b%e5%90%91%e5%85%b6%e6%b7%bb%e5%8a%a0%e5%86%85%e5%ae%b9","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/160221.html","title":{"rendered":"\u80fd\u4e0d\u80fd\u5728\u4e0d\u6539\u53d8\u539f JavaScript \u51fd\u6570\u7684\u60c5\u51b5\u4e0b\u5411\u5176\u6dfb\u52a0\u5185\u5bb9"},"content":{"rendered":"

\"\u80fd\u4e0d\u80fd\u5728\u4e0d\u6539\u53d8\u539f<\/p>\n

\u662f\u53ef\u4ee5\u7684\uff0c\u5728\u4e0d\u6539\u53d8\u539fJavaScript\u51fd\u6570\u7684\u5185\u5bb9\u4e0b\u53ef\u4ee5\u901a\u8fc7\u51e0\u79cd\u65b9\u6cd5\u5411\u5176\u6dfb\u52a0\u5185\u5bb9\uff0c\u5305\u62ec\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\u3001\u4f7f\u7528\u88c5\u9970\u5668\u6a21\u5f0f\u3001\u4f7f\u7528\u539f\u578b\u7ee7\u627f\u3001\u901a\u8fc7\u76d1\u542c\u4e8b\u4ef6\u7b49\u65b9\u5f0f\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\u662f\u4e00\u79cd\u975e\u5e38\u7075\u6d3b\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u6e90\u51fd\u6570\u5b9a\u4e49\u7684\u60c5\u51b5\u4e0b\uff0c\u901a\u8fc7\u6784\u9020\u4e00\u4e2a\u8c03\u7528\u539f\u51fd\u6570\u7684\u65b0\u51fd\u6570\uff0c\u6765"\u5305\u88c5"\u539f\u51fd\u6570\u7684\u884c\u4e3a\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u9ad8\u9636\u51fd\u6570<\/h3>\n<\/p>\n

\u9ad8\u9636\u51fd\u6570\u662f\u63a5\u53d7\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6216\u5c06\u51fd\u6570\u4f5c\u4e3a\u8fd4\u56de\u503c\u7684\u51fd\u6570\u3002\u8fd9\u79cd\u65b9\u5f0f\u4e0d\u9700\u8981\u6539\u53d8\u539f\u51fd\u6570\uff0c\u4f46\u53ef\u4ee5\u5728\u8c03\u7528\u524d\u540e\u6dfb\u52a0\u989d\u5916\u7684\u529f\u80fd\u3002<\/p>\n<\/p>\n

\u51fd\u6570\u5305\u88c5<\/h4>\n<\/p>\n

\u4f60\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u8c03\u7528\u539f\u51fd\u6570\u5e76\u5bf9\u8f93\u5165\u548c\u8f93\u51fa\u64cd\u4f5c\uff0c\u8fd9\u6837\u65e2\u4e0d\u6539\u53d8\u539f\u51fd\u6570\uff0c\u53c8\u6269\u5c55\u4e86\u5176\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u4f60\u60f3\u589e\u52a0\u4e00\u4e2a\u65e5\u5fd7\u529f\u80fd\uff1a<\/p>\n<\/p>\n

function originalFunction(arg) {<\/p>\n
  \/\/ \u539f\u59cb\u529f\u80fd\u4ee3\u7801<\/p>\n
}<\/p>\n
function enhancedFunction(arg) {<\/p>\n
  console.log('Function is about to be called with argument: ', arg);<\/p>\n
  const result = originalFunction(arg);<\/p>\n
  console.log('Function has been called, result: ', result);<\/p>\n
  return result;<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u539f\u59cb\u51fd\u6570originalFunction<\/code>\u4fdd\u6301\u4e0d\u53d8\uff0c\u800c\u589e\u5f3a\u529f\u80fd\u7684\u51fd\u6570enhancedFunction<\/code>\u5728\u8c03\u7528\u539f\u51fd\u6570\u7684\u524d\u540e\u6dfb\u52a0\u4e86\u65e5\u5fd7\u8bb0\u5f55\u7684\u529f\u80fd\u3002<\/strong><\/p>\n<\/p>\n
\u51fd\u6570\u95ed\u5305<\/h4>\n<\/p>\n
\u53e6\u4e00\u79cd\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\u7684\u65b9\u6cd5\u662f\u901a\u8fc7\u95ed\u5305\u5728\u51fd\u6570\u8c03\u7528\u4e4b\u524d\u6216\u4e4b\u540e\u589e\u52a0\u65b0\u7684\u884c\u4e3a\u3002\u95ed\u5305\u53ef\u4ee5\u6355\u83b7\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\uff0c\u4ece\u800c\u8ba9\u60a8\u5728\u51fd\u6570\u6267\u884c\u524d\u540e\u8fdb\u884c\u9644\u52a0\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
function addContentToFunction(originalFunction) {<\/p>\n
  return function(...args) {<\/p>\n
    \/\/ \u5728\u539f\u59cb\u51fd\u6570\u524d\u6267\u884c\u7684\u5185\u5bb9<\/p>\n
    console.log('Before original function');<\/p>\n
    const result = originalFunction.apply(this, args);<\/p>\n
    \/\/ \u5728\u539f\u59cb\u51fd\u6570\u540e\u6267\u884c\u7684\u5185\u5bb9<\/p>\n
    console.log('After original function');<\/p>\n
    return result;<\/p>\n
  };<\/p>\n
}<\/p>\n
const originalFunctionWithContent = addContentToFunction(originalFunction);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u95ed\u5305\uff0c\u539f\u59cb\u51fd\u6570originalFunction<\/code>\u6ca1\u6709\u76f4\u63a5\u88ab\u4fee\u6539\uff0c\u800c\u662f\u901a\u8fc7addContentToFunction<\/code>\u65b9\u6cd5\u589e\u5f3a\u4e86\u5176\u884c\u4e3a\uff0c\u8fd9\u6837\u53ef\u4ee5\u7075\u6d3b\u5730\u4e3a\u4e0d\u540c\u7684\u51fd\u6570\u6dfb\u52a0\u5404\u79cd\u884c\u4e3a\u3002<\/strong><\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u88c5\u9970\u5668\u6a21\u5f0f<\/h3>\n<\/p>\n
\u88c5\u9970\u5668\u6a21\u5f0f\u5728\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7528\u4e8e\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u6dfb\u52a0\u884c\u4e3a\u3002\u5728JavaScript\u4e2d\uff0c\u88c5\u9970\u5668\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528\u9ad8\u9636\u51fd\u6570\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
\u88c5\u9970\u5668\u51fd\u6570<\/h4>\n<\/p>\n
\u88c5\u9970\u5668\u662f\u4e00\u4e2a\u8fd4\u56de\u51fd\u6570\u7684\u51fd\u6570\uff0c\u5b83\u63a5\u6536\u8981\u88ab\u88c5\u9970\u7684\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\uff0c\u8fd9\u4e2a\u65b0\u51fd\u6570\u5728\u5185\u90e8\u8c03\u7528\u539f\u51fd\u6570\uff0c\u5e76\u5728\u8c03\u7528\u524d\u540e\u6267\u884c\u989d\u5916\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n
function decoratorFunction(originalFunction) {<\/p>\n
  return function(...args) {<\/p>\n
    \/\/ \u65b0\u589e\u52a0\u7684\u529f\u80fd<\/p>\n
    console.log('Executing decorated function');<\/p>\n
    return originalFunction(...args);<\/p>\n
  };<\/p>\n
}<\/p>\n
const decoratedOriginalFunction = decoratorFunction(originalFunction);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u539f\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\u4e3a\u5176\u6dfb\u52a0\u529f\u80fd\uff0c\u8fd9\u53ef\u4ee5\u5e94\u7528\u4e8e\u6dfb\u52a0\u9519\u8bef\u5904\u7406\u3001\u65e5\u5fd7\u8bb0\u5f55\u3001\u6743\u9650\u9a8c\u8bc1\u7b49\u3002<\/strong><\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u539f\u578b\u7ee7\u627f<\/h3>\n<\/p>\n
\u5728JavaScript\u4e2d\uff0c\u51fd\u6570\u4e5f\u662f\u5bf9\u8c61\uff0c\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u51fd\u6570\u5bf9\u8c61\u7684\u539f\u578b\uff08prototype\uff09\u6765\u6269\u5c55\u51fd\u6570\u7684\u884c\u4e3a\u3002<\/p>\n<\/p>\n
\u6269\u5c55\u539f\u578b<\/h4>\n<\/p>\n
\u901a\u8fc7\u589e\u52a0\u65b9\u6cd5\u6216\u8005\u5c5e\u6027\u5230\u539f\u51fd\u6570\u7684prototype\u4e0a\uff0c\u53ef\u4ee5\u5f71\u54cd\u6240\u6709\u8be5\u51fd\u6570\u5b9e\u4f8b\u7684\u884c\u4e3a\u3002<\/p>\n<\/p>\n
Function.prototype.enhance = function(enhancementFunction) {<\/p>\n
  const originalFunction = this;<\/p>\n
  return function(...args) {<\/p>\n
    \/\/ \u5728\u539f\u51fd\u6570\u6267\u884c\u524d\u8fd0\u884c\u7684\u4ee3\u7801<\/p>\n
    enhancementFunction.apply(this, args);<\/p>\n
    \/\/ \u8c03\u7528\u539f\u51fd\u6570<\/p>\n
    return originalFunction.apply(this, args);<\/p>\n
  };<\/p>\n
};<\/p>\n
const newFunction = originalFunction.enhance(function() {<\/p>\n
  console.log('Function is enhanced.');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u539f\u51fd\u6570\u901a\u8fc7\u539f\u578b\u94fe\u88ab\u589e\u5f3a\uff0c\u4f7f\u5f97\u6240\u6709\u4f7f\u7528\u4e86\u8be5\u51fd\u6570\u7684\u90e8\u5206\u90fd\u6536\u76ca\u4e8e\u589e\u52a0\u7684\u529f\u80fd\uff0c\u800c\u539f\u51fd\u6570\u4ee3\u7801\u672c\u8eab\u4fdd\u6301\u4e0d\u53d8\u3002<\/strong><\/p>\n<\/p>\n
\u56db\u3001\u901a\u8fc7\u76d1\u542c\u4e8b\u4ef6<\/h3>\n<\/p>\n
\u9488\u5bf9\u67d0\u4e9b\u53ef\u4ee5\u4ea7\u751f\u4e8b\u4ef6\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e8b\u4ef6\u76d1\u542c\u7684\u65b9\u5f0f\u6765\u589e\u52a0\u65b0\u7684\u529f\u80fd\uff0c\u8fd9\u901a\u5e38\u9002\u7528\u4e8e\u90a3\u4e9b\u8bbe\u8ba1\u826f\u597d\u3001\u80fd\u591f\u4ea7\u751f\u4e8b\u4ef6\u5e76\u5141\u8bb8\u76d1\u542c\u8fd9\u4e9b\u4e8b\u4ef6\u7684\u5e93\u6216\u6846\u67b6\u3002<\/p>\n<\/p>\n
\u4e8b\u4ef6\u76d1\u542c\u548c\u89e6\u53d1<\/h4>\n<\/p>\n
\u5728\u539f\u51fd\u6570\u6267\u884c\u524d\u540e\u89e6\u53d1\u81ea\u5b9a\u4e49\u4e8b\u4ef6\uff0c\u7136\u540e\u5728\u5916\u90e8\u5bf9\u8fd9\u4e9b\u4e8b\u4ef6\u8fdb\u884c\u76d1\u542c\u5e76\u6267\u884c\u989d\u5916\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
function originalFunction() {<\/p>\n
  \/\/ \u89e6\u53d1\u201cbeforeCall\u201d\u4e8b\u4ef6<\/p>\n
  document.dispatchEvent(new CustomEvent('beforeCall'));<\/p>\n
  \/\/ \u539f\u51fd\u6570\u4e3b\u4f53\u5185\u5bb9...<\/p>\n
  \/\/ \u89e6\u53d1\u201cafterCall\u201d\u4e8b\u4ef6<\/p>\n
  document.dispatchEvent(new CustomEvent('afterCall'));<\/p>\n
}<\/p>\n
\/\/ \u76d1\u542c\u4e8b\u4ef6<\/p>\n
document.addEventListener('beforeCall', function() {<\/p>\n
  console.log('originalFunction will be called.');<\/p>\n
});<\/p>\n
document.addEventListener('afterCall', function() {<\/p>\n
  console.log('originalFunction has been called.');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u867d\u7136\u8fd9\u8981\u6c42\u4fee\u6539\u539f\u51fd\u6570\u4ee5\u89e6\u53d1\u4e8b\u4ef6\uff0c\u4f46\u8fd9\u4e9b\u6539\u52a8\u5f80\u5f80\u975e\u5e38\u5c0f\u4e14\u6a21\u5757\u5316\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e00\u79cd\u6807\u51c6\u5316\u7684\u65b9\u5f0f\u5728\u51fd\u6570\u6267\u884c\u8fc7\u7a0b\u4e2d\u63d2\u5165\u989d\u5916\u7684\u64cd\u4f5c\u3002<\/strong><\/p>\n<\/p>\n
\u7ed3\u8bba<\/h3>\n<\/p>\n
\u5411\u73b0\u6709\u7684JavaScript\u51fd\u6570\u6dfb\u52a0\u5185\u5bb9\u4e0d\u4e00\u5b9a\u9700\u8981\u4fee\u6539\u51fd\u6570\u672c\u8eab\u3002\u4f60\u53ef\u4ee5\u5229\u7528JavaScript\u7684\u5f3a\u5927\u529f\u80fd\uff0c\u5982\u9ad8\u9636\u51fd\u6570\u3001\u88c5\u9970\u5668\u6a21\u5f0f\u3001\u539f\u578b\u7ee7\u627f\u53ca\u4e8b\u4ef6\u76d1\u542c\uff0c\u4ee5\u7075\u6d3b\u4e14\u5065\u58ee\u7684\u65b9\u5f0f\u589e\u52a0\u6216\u6539\u53d8\u51fd\u6570\u884c\u4e3a\u3002\u901a\u8fc7\u4e0a\u8ff0\u6280\u672f\uff0c\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u539f\u59cb\u4ee3\u7801\u7684\u524d\u63d0\u4e0b\u6269\u5c55\u529f\u80fd\uff0c\u8fd9\u5bf9\u4e8e\u7ef4\u62a4\u4ee3\u7801\u3001\u9075\u5faa\u5f00\u95ed\u539f\u5219\u4ee5\u53ca\u7f16\u5199\u53ef\u91cd\u7528\u4ee3\u7801\u6765\u8bf4\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u5982\u4f55\u5411\u539f JavaScript \u51fd\u6570\u6dfb\u52a0\u989d\u5916\u7684\u529f\u80fd\u6216\u903b\u8f91\uff1f<\/strong><\/p>\n
\u5728\u4e0d\u4fee\u6539\u539f\u51fd\u6570\u4ee3\u7801\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u51fd\u6570\u7684\u88c5\u9970\u5668\u6a21\u5f0f\u6765\u5411\u51fd\u6570\u6dfb\u52a0\u989d\u5916\u7684\u5185\u5bb9\u3002\u88c5\u9970\u5668\u6a21\u5f0f\u662f\u4e00\u79cd\u7ed3\u6784\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u4e0d\u6539\u53d8\u539f\u59cb\u51fd\u6570\u5b9e\u73b0\u7684\u60c5\u51b5\u4e0b\uff0c\u52a8\u6001\u5730\u5c06\u884c\u4e3a\u6dfb\u52a0\u5230\u5df2\u6709\u7684\u51fd\u6570\u4e2d\u3002<\/p>\n
\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\uff0c\u5c06\u539f\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u8be5\u65b0\u51fd\u6570\uff0c\u7136\u540e\u5728\u65b0\u51fd\u6570\u4e2d\u6dfb\u52a0\u6240\u9700\u7684\u989d\u5916\u529f\u80fd\uff0c\u6700\u540e\u8fd4\u56de\u65b0\u51fd\u6570\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u539f\u51fd\u6570\u7684\u529f\u80fd\u6269\u5c55\uff0c\u800c\u65e0\u9700\u76f4\u63a5\u4fee\u6539\u539f\u51fd\u6570\u7684\u4ee3\u7801\u3002<\/p>\n
2. \u5982\u4f55\u5229\u7528 JavaScript \u51fd\u6570\u5305\u88c5\u5668\u6765\u5411\u539f\u51fd\u6570\u4e2d\u6dfb\u52a0\u5185\u5bb9\uff1f<\/strong><\/p>\n
\u51fd\u6570\u5305\u88c5\u5668\u662f\u4e00\u79cd\u5728 JavaScript \u4e2d\u5e38\u7528\u7684\u6280\u672f\uff0c\u53ef\u4ee5\u5728\u4e0d\u6539\u53d8\u539f\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\u5411\u5176\u6dfb\u52a0\u989d\u5916\u7684\u5185\u5bb9\u3002\u4f7f\u7528\u51fd\u6570\u5305\u88c5\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8c03\u7528\u539f\u51fd\u6570\u4e4b\u524d\u6216\u4e4b\u540e\u6267\u884c\u4e00\u4e9b\u989d\u5916\u7684\u903b\u8f91\u3002<\/p>\n
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