{"id":88194,"date":"2024-04-07T17:25:27","date_gmt":"2024-04-07T09:25:27","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/88194.html"},"modified":"2024-04-07T17:25:28","modified_gmt":"2024-04-07T09:25:28","slug":"javascript%e5%8e%9f%e5%9e%8b%e9%93%be%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/88194.html","title":{"rendered":"JavaScript\u539f\u578b\u94fe\u662f\u4ec0\u4e48"},"content":{"rendered":"

\"JavaScript\u539f\u578b\u94fe\u662f\u4ec0\u4e48\"<\/p>\n

JavaScript\u539f\u578b\u94fe\u662f\u4e00\u79cd\u57fa\u4e8e\u539f\u578b\u7684\u7ee7\u627f\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u5bf9\u8c61\u7ee7\u627f\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5<\/strong>\u3002\u6bcf\u4e2aJavaScript\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a\u5185\u90e8\u5c5e\u6027\uff0c\u79f0\u4e3a[[Prototype]]<\/code>\uff0c\u5b83\u6307\u5411\u53e6\u4e00\u4e2a\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u7684\u539f\u578b\u3002\u5f53\u6211\u4eec\u8bd5\u56fe\u8bbf\u95ee\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\u65f6\uff0c\u5982\u679c\u8be5\u5bf9\u8c61\u81ea\u8eab\u6ca1\u6709\u8fd9\u4e9b\u6210\u5458\uff0c\u89e3\u91ca\u5668\u5c31\u4f1a\u6cbf\u7740\u8fd9\u6761\u201c\u94fe\u201d\u5411\u4e0a\u5bfb\u627e\uff0c\u76f4\u5230\u627e\u5230\u8fd9\u4e9b\u6210\u5458\u6216\u5230\u8fbe\u539f\u578b\u94fe\u7684\u672b\u7aef\u3002\u8fd9\u79cd\u673a\u5236\u7279\u522b\u4f53\u73b0\u5728\u6784\u9020\u51fd\u6570\u548c\u5b83\u7684\u5b9e\u4f8b\u5bf9\u8c61\u4e4b\u95f4\uff0c\u5f53\u5b9e\u4f8b\u5bf9\u8c61\u4e2d\u67e5\u627e\u4e0d\u5230\u67d0\u4e2a\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\u65f6\uff0c\u89e3\u91ca\u5668\u4f1a\u6cbf\u7740\u539f\u578b\u94fe\u5411\u4e0a\u5bfb\u627e\uff0c\u76f4\u5230\u627e\u5230\u6216\u8005\u8fbe\u5230\u539f\u578b\u94fe\u7684\u9876\u7aef\u3002<\/p>\n<\/p>\n

\u8fd9\u79cd\u7ee7\u627f\u673a\u5236\u4f7f\u5f97\u5728\u591a\u4e2a\u5bf9\u8c61\u4e4b\u95f4\u5171\u4eab\u5c5e\u6027\u548c\u65b9\u6cd5\u6210\u4e3a\u53ef\u80fd\u3002\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\u65f6\uff0c\u8be5\u6570\u7ec4\u53ef\u4ee5\u4f7f\u7528\u8bf8\u5982push<\/code>\u3001pop<\/code>\u7b49\u65b9\u6cd5\uff0c\u5b83\u4eec\u662f\u4eceArray.prototype<\/code>\u7ee7\u627f\u6765\u7684\uff0c\u8fd9\u662f\u56e0\u4e3a\u6bcf\u4e2a\u7531\u6570\u7ec4\u6784\u9020\u51fd\u6570\u521b\u5efa\u7684\u6570\u7ec4\u5bf9\u8c61\u7684[[Prototype]]<\/code>\u90fd\u6307\u5411Array.prototype<\/code>\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u539f\u578b\u94fe\u7684\u5de5\u4f5c\u539f\u7406<\/h3>\n<\/p>\n

\u7ee7\u627f\u548c\u539f\u578b\u5bf9\u8c61<\/h4>\n<\/p>\n

\u6bcf\u4e2a\u51fd\u6570\u5728\u521b\u5efa\u65f6\u4f1a\u81ea\u5e26\u4e00\u4e2aprototype<\/code>\u5c5e\u6027\uff0c\u5b83\u6307\u5411\u51fd\u6570\u7684\u539f\u578b\u5bf9\u8c61\uff0c\u5e76\u4e14\u8fd9\u4e2a\u539f\u578b\u5bf9\u8c61\u81ea\u52a8\u83b7\u53d6\u4e00\u4e2a\u5c5e\u6027constructor\uff0c\u6307\u5411\u51fd\u6570\u672c\u8eab\u3002\u5f53\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff08\u5b9e\u4f8b\uff09\u65f6\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5185\u90e8\u7684[[Prototype]]<\/code>\u4f1a\u6307\u5411\u6784\u9020\u51fd\u6570\u7684prototype<\/code>\u5c5e\u6027\u3002\u8fd9\u4e00\u94fe\u63a5\u5c31\u662f\u5b9e\u73b0\u7ee7\u627f\u7684\u5173\u952e\u73af\u8282\uff0c\u4f7f\u5f97\u5b9e\u4f8b\u53ef\u4ee5\u8bbf\u95ee\u6784\u9020\u51fd\u6570\u539f\u578b\u4e0a\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u5c5e\u6027\u67e5\u627e\u8fc7\u7a0b<\/h4>\n<\/p>\n

\u5f53\u8bbf\u95ee\u5bf9\u8c61\u7684\u4e00\u4e2a\u5c5e\u6027\u65f6\uff0c\u89e3\u91ca\u5668\u9996\u5148\u5728\u5bf9\u8c61\u672c\u8eab\u67e5\u627e\uff0c\u5982\u679c\u5bf9\u8c61\u81ea\u8eab\u5b58\u5728\u8fd9\u4e2a\u5c5e\u6027\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u8be5\u5c5e\u6027\u7684\u503c\u3002\u5982\u679c\u6ca1\u6709\u627e\u5230\uff0c\u5219\u6cbf\u7740\u539f\u578b\u94fe\u5411\u4e0a\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u4e3a\u6b62\u6216\u67e5\u5230\u539f\u578b\u94fe\u7684\u9876\u7aef\uff08Object.prototype<\/code>\uff09\uff0c\u8fd9\u4e2a\u9876\u7aef\u7684\u539f\u578b\u94fe\u4e3anull<\/code>\uff0c\u81f3\u6b64\u67e5\u627e\u505c\u6b62\u3002\u5982\u679c\u6574\u4e2a\u539f\u578b\u94fe\u4e0a\u90fd\u6ca1\u6709\u627e\u5230\u5c5e\u6027\uff0c\u5219\u8fd4\u56deundefined<\/code>\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u539f\u578b\u94fe\u7684\u91cd\u8981\u6027<\/h3>\n<\/p>\n

\u4ee3\u7801\u590d\u7528<\/h4>\n<\/p>\n

\u539f\u578b\u94fe\u673a\u5236\u5141\u8bb8\u5bf9\u8c61\u590d\u7528\u5176\u4ed6\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u8fd9\u610f\u5473\u7740\u5f00\u53d1\u8005\u65e0\u9700\u5728\u6bcf\u4e2a\u5bf9\u8c61\u4e2d\u91cd\u590d\u5b9a\u4e49\u76f8\u540c\u7684\u65b9\u6cd5\uff0c\u53ea\u9700\u5b9a\u4e49\u4e00\u6b21\u5728\u539f\u578b\u4e0a\uff0c\u5373\u53ef\u88ab\u591a\u4e2a\u5b9e\u4f8b\u5171\u4eab\u4f7f\u7528\uff0c\u5927\u5927\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u590d\u7528\u6027\u3002<\/p>\n<\/p>\n

\u52a8\u6001\u59d4\u6258<\/h4>\n<\/p>\n

\u5f53\u6211\u4eec\u5728\u4e00\u4e2a\u5bf9\u8c61\u4e0a\u589e\u52a0\u6216\u8005\u6539\u53d8\u67d0\u4e2a\u65b9\u6cd5\u65f6\uff0c\u5b83\u7684\u6539\u53d8\u53ef\u4ee5\u53cd\u6620\u5230\u6240\u6709\u4ece\u5b83\u7ee7\u627f\u7684\u5bf9\u8c61\u4e0a\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u5bf9\u8c61\u901a\u8fc7\u539f\u578b\u94fe\u56de\u6eaf\u5230\u8fd9\u4e2a\u88ab\u4fee\u6539\u7684\u5bf9\u8c61\u3002\u8fd9\u5c31\u662f\u52a8\u6001\u59d4\u6258\u7684\u6982\u5ff5\uff0c\u5373\u4e0d\u9700\u8981\u6bcf\u4e2a\u5bf9\u8c61\u5355\u72ec\u7ba1\u7406\u548c\u7ef4\u62a4\u5c5e\u6027\uff0c\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u53ef\u4ee5\u81ea\u52a8\u83b7\u5f97\u539f\u578b\u4e0a\u7684\u66f4\u65b0\u3002<\/p>\n<\/p>\n

\u4e09\u3001\u539f\u578b\u94fe\u5e26\u6765\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848<\/h3>\n<\/p>\n

\u6027\u80fd\u95ee\u9898<\/h4>\n<\/p>\n

\u56e0\u4e3a\u5bf9\u8c61\u5c5e\u6027\u7684\u67e5\u627e\u4f1a\u6cbf\u7740\u539f\u578b\u94fe\u8fdb\u884c\uff0c\u6240\u4ee5\u5728\u67e5\u627e\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u4f1a\u4ea7\u751f\u8fc7\u957f\u7684\u67e5\u627e\u8def\u5f84\uff0c\u7279\u522b\u662f\u5728\u6df1\u5ea6\u7ee7\u627f\u7684\u60c5\u51b5\u4e0b\uff0c\u6027\u80fd\u53ef\u80fd\u6210\u95ee\u9898\u3002\u5c24\u5176\u662f\u5f53\u67e5\u627e\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u5c5e\u6027\u65f6\uff0c\u5b83\u5c06\u904d\u5386\u6574\u4e2a\u539f\u578b\u94fe\u76f4\u5230\u9876\u7aef\u3002<\/p>\n<\/p>\n

\u539f\u578b\u6c61\u67d3\u548c\u610f\u5916\u7ee7\u627f<\/h4>\n<\/p>\n

\u5f53\u539f\u578b\u4e0a\u7684\u5c5e\u6027\u662f\u5f15\u7528\u7c7b\u578b\u65f6\uff0c\u4fee\u6539\u8fd9\u4e9b\u5c5e\u6027\u5c06\u5f71\u54cd\u5230\u6240\u6709\u7ee7\u627f\u8fd9\u4e2a\u539f\u578b\u7684\u5bf9\u8c61\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u610f\u5916\u7684\u526f\u4f5c\u7528\u3002\u6b64\u5916\uff0c\u5982\u679c\u4e0d\u5c0f\u5fc3\u6539\u53d8\u4e86\u5982Object.prototype\u4e0a\u7684\u67d0\u4e2a\u65b9\u6cd5\u6216\u5c5e\u6027\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u5230\u6574\u4e2a\u73af\u5883\u4e2d\u7684\u6240\u6709\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

\u56db\u3001\u539f\u578b\u94fe\u7684\u5e94\u7528<\/h3>\n<\/p>\n

\u52a8\u6001\u539f\u578b\u6a21\u5f0f<\/h4>\n<\/p>\n

\u52a8\u6001\u539f\u578b\u6a21\u5f0f\u901a\u8fc7\u5728\u6784\u9020\u51fd\u6570\u4e2d\u6dfb\u52a0\u65b9\u6cd5\u548c\u5c5e\u6027\u81f3\u6784\u9020\u51fd\u6570\u7684\u539f\u578b\u4e0a\uff0c\u7ed3\u5408\u4e86\u6784\u9020\u51fd\u6570\u548c\u539f\u578b\u6a21\u5f0f\u7684\u4f18\u70b9\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u53ef\u4ee5\u5728\u5fc5\u8981\u65f6\u8fdb\u884c\u521d\u59cb\u5316\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ea\u6709\u5728\u7b2c\u4e00\u6b21\u8c03\u7528\u6784\u9020\u51fd\u6570\u65f6\u624d\u4f1a\u5bf9prototype\u8fdb\u884c\u4fee\u6539\uff0c\u4e4b\u540e\u7684\u6240\u6709\u5b9e\u4f8b\u90fd\u4f1a\u5171\u4eab\u8fd9\u4e9b\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u7ee7\u627f\u6a21\u5f0f\u7684\u6f14\u53d8<\/h4>\n<\/p>\n

\u968f\u7740ES6\u7684\u5230\u6765\uff0cJavaScript\u5f15\u5165\u4e86class\u5173\u952e\u5b57\u4f5c\u4e3a\u65b0\u7684\u8bed\u6cd5\u7cd6\uff0c\u5185\u90e8\u4ecd\u7136\u4f7f\u7528\u539f\u578b\u94fe\u5b9e\u73b0\u7ee7\u627f\u3002\u901a\u8fc7\u4f7f\u7528extends\u548csuper\u5173\u952e\u5b57\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u66f4\u76f4\u89c2\u5730\u5b9e\u73b0\u7c7b\u7684\u7ee7\u627f\uff0c\u8fd9\u4f7f\u5f97\u7ee7\u627f\u903b\u8f91\u66f4\u6e05\u6670\uff0c\u66f4\u8d34\u8fd1\u4e8e\u4f20\u7edf\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u8bed\u6cd5\u3002<\/p>\n<\/p>\n

JavaScript\u7684\u539f\u578b\u94fe\u662f\u5b9e\u73b0\u7ee7\u627f\u7684\u4e00\u79cd\u5f3a\u5927\u673a\u5236\uff0c\u5b83\u4fc3\u6210\u4e86\u8bb8\u591a\u6838\u5fc3\u7279\u6027\u548c\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5b9e\u73b0\u3002\u5c3d\u7ba1\u5b83\u53ef\u80fd\u4f1a\u5e26\u6765\u4e00\u4e9b\u95ee\u9898\uff0c\u4f46\u901a\u8fc7\u6b63\u786e\u7684\u6a21\u5f0f\u548c\u5b9e\u8df5\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u5145\u5206\u5229\u7528\u5176\u63d0\u4f9b\u7684\u5f3a\u5927\u529f\u80fd\u548c\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

1. JavaScript\u4e2d\u7684\u539f\u578b\u94fe\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/strong><\/p>\n

\u5728JavaScript\u4e2d\uff0c\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a\u539f\u578b\u5bf9\u8c61\uff0c\u5b83\u662f\u4e00\u4e2a\u6307\u5411\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u5f53\u6211\u4eec\u8bbf\u95ee\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\u65f6\uff0c\u5982\u679c\u5bf9\u8c61\u81ea\u8eab\u6ca1\u6709\u8be5\u5c5e\u6027\u6216\u65b9\u6cd5\uff0cJavaScript\u4f1a\u6cbf\u7740\u539f\u578b\u94fe\u5411\u4e0a\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u4e3a\u6b62\u3002\u8fd9\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u539f\u578b\u94fe\u6765\u5b9e\u73b0\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u7ee7\u627f\u3002<\/p>\n

2. \u539f\u578b\u94fe\u662f\u5982\u4f55\u5f71\u54cd\u5bf9\u8c61\u4e4b\u95f4\u7684\u5173\u7cfb\u7684\uff1f<\/strong><\/p>\n

\u901a\u8fc7\u539f\u578b\u94fe\uff0c\u5bf9\u8c61\u53ef\u4ee5\u7ee7\u627f\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u8fd9\u610f\u5473\u7740\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u7ee7\u627f\u5176\u539f\u578b\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u5982\u679c\u6211\u4eec\u4fee\u6539\u539f\u578b\u5bf9\u8c61\uff0c\u8fd9\u4e9b\u4fee\u6539\u4e5f\u4f1a\u53cd\u6620\u5728\u6240\u6709\u7ee7\u627f\u8be5\u539f\u578b\u5bf9\u8c61\u7684\u5bf9\u8c61\u4e2d\u3002\u8fd9\u79cd\u7ee7\u627f\u5173\u7cfb\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7ec4\u7ec7\u548c\u590d\u7528\u4ee3\u7801\u3002<\/p>\n

3. \u5982\u4f55\u4f7f\u7528\u539f\u578b\u94fe\u6269\u5c55JavaScript\u5bf9\u8c61\u7684\u529f\u80fd\uff1f<\/strong><\/p>\n

\u901a\u8fc7\u539f\u578b\u94fe\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a\u5df2\u6709\u7684JavaScript\u5bf9\u8c61\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u5bf9\u8c61\u7684\u539f\u578b\u5bf9\u8c61\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002\u5f53\u6211\u4eec\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u5c5e\u6027\u6216\u65b9\u6cd5\u5230\u539f\u578b\u5bf9\u8c61\u4e0a\u65f6\uff0c\u6240\u6709\u7ee7\u627f\u8be5\u539f\u578b\u5bf9\u8c61\u7684\u5bf9\u8c61\u90fd\u4f1a\u83b7\u5f97\u8fd9\u4e9b\u65b0\u7684\u529f\u80fd\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u5bf9\u8c61\u672c\u8eab\u7684\u60c5\u51b5\u4e0b\uff0c\u52a8\u6001\u5730\u6269\u5c55\u5bf9\u8c61\u7684\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript\u539f\u578b\u94fe\u662f\u4e00\u79cd\u57fa\u4e8e\u539f\u578b\u7684\u7ee7\u627f\u673a\u5236\uff0c\u5b83\u5141\u8bb8\u5bf9\u8c61\u7ee7\u627f\u53e6\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u6bcf\u4e2aJavaScri […]","protected":false},"author":3,"featured_media":88195,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/88194"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=88194"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/88194\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/88195"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=88194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=88194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=88194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}