{"id":2591,"date":"2024-11-10T10:50:28","date_gmt":"2024-11-10T02:50:28","guid":{"rendered":"https:\/\/fwq.ai\/blog\/2591\/"},"modified":"2024-11-10T10:50:28","modified_gmt":"2024-11-10T02:50:28","slug":"javascript-%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%ef%bc%9a%e6%8e%8c%e6%8f%a1%e5%88%9b%e5%bb%ba%e3%80%81%e7%bb%93%e6%9e%84%e5%92%8c%e8%a1%8c%e4%b8%ba%e6%a8%a1%e5%bc%8f%e4%bb%a5%e8%8e%b7%e5%be%97%e6%9b%b4","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/2591\/","title":{"rendered":"JavaScript \u8bbe\u8ba1\u6a21\u5f0f\uff1a\u638c\u63e1\u521b\u5efa\u3001\u7ed3\u6784\u548c\u884c\u4e3a\u6a21\u5f0f\u4ee5\u83b7\u5f97\u66f4\u7b80\u6d01\u7684\u4ee3\u7801"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173080678138360.jpg\" class=\"aligncenter\" title=\"JavaScript \u8bbe\u8ba1\u6a21\u5f0f\uff1a\u638c\u63e1\u521b\u5efa\u3001\u7ed3\u6784\u548c\u884c\u4e3a\u6a21\u5f0f\u4ee5\u83b7\u5f97\u66f4\u7b80\u6d01\u7684\u4ee3\u7801\u63d2\u56fe\" alt=\"JavaScript \u8bbe\u8ba1\u6a21\u5f0f\uff1a\u638c\u63e1\u521b\u5efa\u3001\u7ed3\u6784\u548c\u884c\u4e3a\u6a21\u5f0f\u4ee5\u83b7\u5f97\u66f4\u7b80\u6d01\u7684\u4ee3\u7801\u63d2\u56fe\" \/><\/p>\n<p>JavaScript \u662f\u4e00\u79cd\u591a\u529f\u80fd\u8bed\u8a00\uff0c\u4f46\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u89c4\u6a21\u7684\u589e\u957f\uff0c\u4e8b\u60c5\u5f88\u5feb\u5c31\u4f1a\u5931\u63a7\u3002\u8fd9\u5c31\u662f\u8bbe\u8ba1\u6a21\u5f0f\uff08\u9488\u5bf9\u91cd\u590d\u51fa\u73b0\u7684\u7f16\u7a0b\u95ee\u9898\u7684\u7ecf\u8fc7\u5b9e\u9645\u6d4b\u8bd5\u7684\u89e3\u51b3\u65b9\u6848\uff09\u53d1\u6325\u4f5c\u7528\u7684\u5730\u65b9\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u4eba\u4eec\u521b\u5efa\u66f4\u53ef\u7ef4\u62a4\u3001\u53ef\u6269\u5c55\u548c\u9ad8\u6027\u80fd\u7684\u4ee3\u7801\u3002\u5982\u679c\u60a8\u521a\u521a\u5f00\u59cb\u4f7f\u7528 JavaScript \u8fdb\u884c\u5f00\u53d1\uff0c\u6216\u8005\u6b63\u5728\u5bfb\u627e\u63d0\u9ad8\u6280\u80fd\u7684\u65b9\u6cd5\uff0c\u90a3\u4e48\u4e86\u89e3\u8fd9\u4e9b\u6a21\u5f0f\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u5c06\u4ecb\u7ecd\u4e0d\u540c\u7c7b\u578b\u7684\u8bbe\u8ba1\u6a21\u5f0f\uff1a\u521b\u5efa\u578b\u3001\u7ed3\u6784\u578b\u548c\u884c\u4e3a\u578b\u3002\u5b83\u8fd8\u5c06\u8ba8\u8bba\u4ed6\u4eec\u5982\u4f55\u7b80\u5316\u548c\u7b80\u5316\u60a8\u7684 JavaScript \u9879\u76ee\u3002\u8ba9\u6211\u4eec\u5f00\u59cb\u5427\uff01<\/p>\n<ol>\n<li>\u521b\u5efa\u6a21\u5f0f\uff1a\u667a\u80fd\u5bf9\u8c61\u521b\u5efa \u4e00\u822c\u6765\u8bf4\uff0c\u521b\u5efa\u6a21\u5f0f\u6d89\u53ca\u5bf9\u8c61\u521b\u5efa\u673a\u5236\u3002\u8fd9\u4e9b\u6a21\u5f0f\u4e0d\u662f\u76f4\u63a5\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u800c\u662f\u63d0\u4f9b\u4e86\u4ee5\u53ef\u91cd\u7528\u7684\u65b9\u5f0f\u521b\u5efa\u5b9e\u4f8b\u7684\u7075\u6d3b\u65b9\u6cd5\uff0c\u800c\u4e0d\u5fc5\u6bcf\u6b21\u90fd\u7f16\u5199\u590d\u6742\u7684\u903b\u8f91\u3002<\/li>\n<\/ol>\n<p>JavaScript \u4e2d\u7684\u5173\u952e\u521b\u5efa\u6a21\u5f0f\uff1a<\/p>\n<p>\u5de5\u5382\u6a21\u5f0f\uff1a\u5de5\u5382\u6a21\u5f0f\u521b\u5efa\u5bf9\u8c61\u65f6\u4e0d\u6307\u5b9a\u7c7b\u3002\u5f53\u60a8\u60f3\u8981\u5728\u4e00\u4e2a\u5171\u4eab\u63a5\u53e3\u4e0b\u521b\u5efa\u5404\u79cd\u7c7b\u578b\u7684\u5bf9\u8c61\u65f6\uff0c\u5b83\u975e\u5e38\u6709\u7528\u3002\u793a\u4f8b\uff1a<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<p>\u7c7b AnimalFactory {<br \/> \u521b\u5efa\u52a8\u7269\uff08\u7c7b\u578b\uff09{<br \/> \u5f00\u5173\uff08\u7c7b\u578b\uff09{<br \/> \u6848\u4f8b\u201c\u72d7\u201d\uff1a<br \/> \u8fd4\u56de\u65b0\u7684 Dog();<br \/> \u6848\u4f8b\u201c\u732b\u201d\uff1a<br \/> \u8fd4\u56de\u65b0\u7684 Cat();<br \/> \u9ed8\u8ba4\u503c\uff1a<br \/> throw new Error(&#8216;\u672a\u77e5\u52a8\u7269\u7c7b\u578b&#8217;);<br \/> }<br \/> }<br \/> }<\/p>\n<p>\u5355\u4f8b\u6a21\u5f0f\uff1a\u5b83\u5c06\u5176\u7c7b\u7684\u5b9e\u4f8b\u5316\u9650\u5236\u4e3a\u5355\u4e2a\u5b9e\u4f8b\u3002\u8fd9\u5bf9\u4e8e\u7ba1\u7406\u5168\u5c40\u8d44\u6e90\u5f88\u6709\u7528\u3002<\/p>\n<p>\u7c7b\u5355\u4f8b{<br \/> \u6784\u9020\u51fd\u6570() {<br \/> if (!Singleton.instance) {<br \/> Singleton.instance = this;<br \/> }<br \/> \u8fd4\u56de Singleton.instance;<br \/> }<br \/> }<\/p>\n<p>\u4f55\u65f6\u5e94\u7528\u521b\u4f5c\u6a21\u5f0f\uff1a<\/p>\n<p>\u5f53\u4f60\u6709\u590d\u6742\u7684\u5bf9\u8c61\u521b\u5efa\u903b\u8f91\u65f6<br \/> \u5f53\u4f60\u6709\u591a\u4e2a\u5177\u6709\u5171\u4eab\u65b9\u6cd5\u7684\u5b50\u7c7b\u65f6<br \/> \u5982\u679c\u60a8\u60f3\u63a7\u5236\u8d44\u6e90\u521b\u5efa\uff0c\u4f8b\u5982 &#8211; Singleton<\/p>\n<ol>\n<li>\u7ed3\u6784\u6a21\u5f0f\uff1a\u6b64\u6a21\u5f0f\u56de\u7b54\u4e86\u4ee5\u4e0b\u95ee\u9898\uff1a\u201c\u4e00\u822c\u60c5\u51b5\u4e0b\u6211\u5982\u4f55\u7ec4\u7ec7\u4ee3\u7801\u5143\u7d20\u4e4b\u95f4\u7684\u5173\u7cfb\uff1f<\/li>\n<\/ol>\n<p>\u7ed3\u6784\u6a21\u5f0f\u5c06\u4e3a\u5bf9\u8c61\u4e4b\u95f4\u7684\u5173\u7cfb\u63d0\u4f9b\u4e00\u79cd\u7ed3\u6784\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u6a21\u5757\u5316\u548c\u7075\u6d3b\u3002\u5728\u8fd9\u65b9\u9762\uff0c\u60a8\u53ef\u4ee5\u66f4\u597d\u5730\u5904\u7406\u4ee3\u7801\u4e2d\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u56e0\u4e3a\u4ee3\u7801\u4e5f\u53d8\u5f97\u66f4\u5177\u53ef\u8bfb\u6027\u3002<\/p>\n<p><strong>JavaScript \u4e2d\u7684\u5173\u952e\u7ed3\u6784\u6a21\u5f0f\uff1a<\/strong><\/p>\n<p>\u88c5\u9970\u5668\u6a21\u5f0f\uff1a\u5141\u8bb8\u5411\u73b0\u6709\u5bf9\u8c61\u6dfb\u52a0\u65b0\u529f\u80fd\u800c\u4e0d\u6539\u53d8\u5176\u7ed3\u6784\u3002\u975e\u5e38\u9002\u5408\u5728\u4e0d\u66f4\u6539\u6838\u5fc3\u5bf9\u8c61\u7684\u60c5\u51b5\u4e0b\u6dfb\u52a0\u53ef\u9009\u529f\u80fd\u3002<\/p>\n<p>\u51fd\u6570 carWithGPS(car) {<br \/> car.gps = true;<br \/> \u8fd8\u8f66\uff1b<br \/> }<\/p>\n<p>\u5916\u89c2\u6a21\u5f0f\uff1a\u901a\u8fc7\u4f7f\u7528\u5355\u4e2a\u7b80\u5316\u7684\u754c\u9762\u6765\u7b80\u5316\u590d\u6742\u7684\u7cfb\u7edf\u3002\u65e0\u9700\u8bbf\u95ee\u591a\u4e2a\u6a21\u5757\uff0c\u800c\u662f\u4e0e\u5355\u4e2a\u7c7b\u4ea4\u4e92\u3002<\/p>\n<p>\/**<\/p>\n<ul>\n<li> @class CarFacade &#8211; \u8bbf\u95ee\u6c7d\u8f66\u5b9e\u73b0\u7ec6\u8282\u7684\u5165\u53e3\u70b9*\/ \u7c7b CarFacade { \u542f\u52a8\u6c7d\u8f66\uff08\uff09{ \u5f15\u64ce.start(); \u7535\u6c60.powerOn(); \u71c3\u6599.\u6ce8\u5165(); } } \u4f55\u65f6\u4f7f\u7528\u7ed3\u6784\u6a21\u5f0f\uff1a<\/li>\n<\/ul>\n<p>\u5f53\u9700\u8981\u6dfb\u52a0\u6216\u66f4\u6539\u5bf9\u8c61\u7684\u529f\u80fd\u65f6\uff1b\u5f53\u4e00\u4e2a\u4eba\u6b63\u5728\u5904\u7406\u590d\u6742\u7684\u7cfb\u7edf\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u7b80\u5316\u754c\u9762\u6765\u66f4\u597d\u5730\u670d\u52a1\uff1b <\/p>\n<ol>\n<li>\u884c\u4e3a\u6a21\u5f0f\uff1a\u6539\u8fdb\u5bf9\u8c61\u4ea4\u4e92\u884c\u4e3a\u6a21\u5f0f\u5b9a\u4e49\u4e86\u7a0b\u5e8f\u4e2d\u7684\u5bf9\u8c61\u5982\u4f55\u4ea4\u4e92\u3002\u5b83\u4eec\u4f7f\u5bf9\u8c61\u80fd\u591f\u6709\u6548\u5730\u534f\u540c\u5de5\u4f5c\uff0c\u4f46\u4ee5\u677e\u6563\u8026\u5408\u7684\u65b9\u5f0f\u3002 <\/li>\n<\/ol>\n<p><strong>JavaScript \u4e2d\u7684\u5173\u952e\u884c\u4e3a\u6a21\u5f0f\uff1a<\/strong><\/p>\n<p>\u89c2\u5bdf\u8005\u6a21\u5f0f\uff1a\u53ef\u80fd\u662f\u6700\u5e7f\u6cdb\u7684\u6a21\u5f0f\u4e4b\u4e00\uff0c\u7279\u522b\u662f\u5728\u57fa\u4e8e\u4e8b\u4ef6\u7684\u7cfb\u7edf\u4e2d\u3002\u5bf9\u8c61\uff08\u89c2\u5bdf\u8005\uff09\u53ef\u4ee5\u8ba2\u9605\u53e6\u4e00\u4e2a\u5bf9\u8c61\uff08\u4e3b\u9898\uff09\u7684\u66f4\u65b0\u5e76\u91c7\u53d6\u76f8\u5e94\u7684\u884c\u52a8\u3002<\/p>\n<p>\u7c7b\u4e3b\u9898 {<br \/> \u6784\u9020\u51fd\u6570() {<br \/> this.observers = [];<br \/> }<br \/> \u8ba2\u9605\uff08\u89c2\u5bdf\u8005\uff09{<br \/> this.observers.push(\u89c2\u5bdf\u8005);<br \/> }<br \/> \u901a\u77e5\uff08\uff09{<br \/> this.observers.forEach(observer =&gt;observer.update());<br \/> }<br \/> }<\/p>\n<p>\u547d\u4ee4\u6a21\u5f0f\uff1a\u5c06\u64cd\u4f5c\u5c01\u88c5\u4e3a\u5bf9\u8c61\u3002\u8fd9\u5728\u9700\u8981\u7ba1\u7406\u3001\u6392\u961f\u6216\u64a4\u6d88\u64cd\u4f5c\u7684\u7cfb\u7edf\u4e2d\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p>\u7c7b\u547d\u4ee4 {<br \/> \u6267\u884c() {<br \/> console.log(&#8220;\u6267\u884c\u547d\u4ee4&#8221;);<br \/> }<br \/> }<\/p>\n<p>\u4f55\u65f6\u4f7f\u7528\u884c\u4e3a\u6a21\u5f0f\uff1a<\/p>\n<p>\u5f53\u5bf9\u8c61\u9700\u8981\u5728\u4e0d\u7d27\u5bc6\u7ed1\u5b9a\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u901a\u4fe1\u65f6<br \/> \u4e8b\u4ef6\u9a71\u52a8\u67b6\u6784 &#8211; \u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u7684\u53d8\u5316\u5fc5\u987b\u5bfc\u81f4\u5176\u4ed6\u5bf9\u8c61\u7684\u53cd\u5e94<\/p>\n<p><strong>\u5728 JavaScript \u4e2d\u4f7f\u7528\u8bbe\u8ba1\u6a21\u5f0f\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<p>\u5c0f\u8d77\u70b9\uff1a\u8bf8\u5982 Singleton \u548c Factory \u4e4b\u7c7b\u7684\u6a21\u5f0f\u975e\u5e38\u5bb9\u6613\u4e0a\u624b\uff0c\u5e76\u4e14\u53ef\u4ee5\u76f4\u63a5\u7528\u4e8e\u8f83\u5c0f\u7684\u9879\u76ee\u3002<\/p>\n<p>\u9996\u5148\u4fdd\u6301\u5e72\u51c0\uff1a\u6a21\u5f0f\u662f\u4e3a\u4e86\u5e2e\u52a9\u4f60\u7684\u4ee3\u7801\uff0c\u800c\u4e0d\u662f\u8ba9\u5b83\u53d8\u5f97\u590d\u6742\uff1b\u5728\u5e94\u7528\u6a21\u5f0f\u4e4b\u524d\u68c0\u67e5\u4ee3\u7801\u672c\u8eab\u662f\u5426\u5e72\u51c0\u4e14\u53ef\u8bfb\u3002<\/p>\n<p>\u77e5\u9053\u4f55\u65f6\u91cd\u6784\uff1a\u6a21\u5f0f\u5728\u9700\u8981\u53ef\u6269\u5c55\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u7684\u6210\u719f\u4ee3\u7801\u5e93\u4e2d\u6700\u6709\u7528\u3002<\/p>\n<p>\u9002\u5e94\u6027\u5f3a\uff1a\u5e94\u907f\u514d\u7531\u4e8e\u8fc7\u5ea6\u4f7f\u7528\u6a21\u5f0f\u800c\u4f7f\u4ee3\u7801\u53d8\u5f97\u6bd4\u6240\u9700\u7684\u66f4\u590d\u6742\u3002\u7b80\u5355\u6027\u548c\u53ef\u8bfb\u6027\u5e94\u59cb\u7ec8\u88ab\u89c6\u4e3a\u6700\u91cd\u8981\u7684\u3002<\/p>\n<p>JavaScript \u8bbe\u8ba1\u6a21\u5f0f\u4e0d\u4ec5\u4ec5\u662f\u62bd\u8c61\u6982\u5ff5\uff1b\u5b83\u4eec\u662f\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u80af\u5b9a\u4f1a\u5c06\u60a8\u7684\u4ee3\u7801\u8d28\u91cf\u53d8\u5f97\u66f4\u5177\u53ef\u6269\u5c55\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u8c03\u8bd5\u6027\u3002\u901a\u8fc7\u638c\u63e1\u521b\u9020\u3001\u7ed3\u6784\u548c\u884c\u4e3a\u6a21\u5f0f\uff0c\u60a8\u5c06\u83b7\u5f97\u65e0\u6240\u754f\u60e7\u5730\u5904\u7406\u590d\u6742\u9879\u76ee\u7684\u6280\u672f\u3002<\/p>\n<p>\u5c1d\u8bd5\u4e00\u4e0b\uff01\u73b0\u5728\u662f\u60a8\u5728\u9879\u76ee\u4e2d\u5b9e\u73b0\u8fd9\u4e9b\u6a21\u5f0f\u7684\u65f6\u5019\u4e86\uff0c\u770b\u770b\u8fd9\u5c06\u5982\u4f55\u5c06\u60a8\u7684\u4ee3\u7801\u63d0\u5347\u5230\u4e00\u4e2a\u65b0\u7684\u6c34\u5e73\uff01<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fJavaScript \u8bbe\u8ba1\u6a21\u5f0f\uff1a\u638c\u63e1\u521b\u5efa\u3001\u7ed3\u6784\u548c\u884c\u4e3a\u6a21\u5f0f\u4ee5\u83b7\u5f97\u66f4\u7b80\u6d01\u7684\u4ee3\u7801\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript \u662f\u4e00\u79cd\u591a\u529f\u80fd\u8bed\u8a00\uff0c\u4f46\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u89c4\u6a21\u7684\u589e\u957f\uff0c\u4e8b\u60c5\u5f88\u5feb\u5c31\u4f1a\u5931\u63a7\u3002\u8fd9\u5c31\u662f\u8bbe\u8ba1\u6a21\u5f0f\uff08\u9488\u5bf9\u91cd\u590d\u51fa\u73b0\u7684\u7f16\u7a0b\u95ee\u9898\u7684\u7ecf\u8fc7\u5b9e\u9645\u6d4b\u8bd5\u7684\u89e3\u51b3\u65b9\u6848\uff09\u53d1\u6325\u4f5c\u7528\u7684\u5730\u65b9\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u4eba\u4eec\u521b\u5efa\u66f4\u53ef\u7ef4\u62a4\u3001\u53ef\u6269\u5c55\u548c\u9ad8\u6027\u80fd\u7684\u4ee3\u7801\u3002\u5982\u679c\u60a8\u521a\u521a\u5f00\u59cb\u4f7f\u7528 JavaScript \u8fdb\u884c\u5f00\u53d1\uff0c\u6216\u8005\u6b63\u5728\u5bfb\u627e\u63d0\u9ad8\u6280\u80fd\u7684\u65b9\u6cd5\uff0c\u90a3\u4e48\u4e86\u89e3\u8fd9\u4e9b\u6a21\u5f0f\u81f3\u5173\u91cd\u8981\u3002 \u8fd9\u7bc7\u6587\u7ae0\u5c06\u4ecb\u7ecd\u4e0d\u540c\u7c7b\u578b\u7684\u8bbe\u8ba1\u6a21\u5f0f\uff1a\u521b\u5efa\u578b\u3001\u7ed3\u6784\u578b\u548c\u884c\u4e3a\u578b\u3002\u5b83\u8fd8\u5c06\u8ba8\u8bba\u4ed6\u4eec\u5982\u4f55\u7b80\u5316\u548c\u7b80\u5316\u60a8\u7684 JavaScript \u9879\u76ee\u3002\u8ba9\u6211\u4eec\u5f00\u59cb\u5427\uff01 \u521b\u5efa\u6a21\u5f0f\uff1a\u667a\u80fd\u5bf9\u8c61\u521b\u5efa \u4e00\u822c\u6765\u8bf4\uff0c\u521b\u5efa\u6a21\u5f0f\u6d89\u53ca\u5bf9\u8c61\u521b\u5efa\u673a\u5236\u3002\u8fd9\u4e9b\u6a21\u5f0f\u4e0d\u662f\u76f4\u63a5\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff0c\u800c\u662f\u63d0\u4f9b\u4e86\u4ee5\u53ef\u91cd\u7528\u7684\u65b9\u5f0f\u521b\u5efa\u5b9e\u4f8b\u7684\u7075\u6d3b\u65b9\u6cd5\uff0c\u800c\u4e0d\u5fc5\u6bcf\u6b21\u90fd\u7f16\u5199\u590d\u6742\u7684\u903b\u8f91\u3002 JavaScript \u4e2d\u7684\u5173\u952e\u521b\u5efa\u6a21\u5f0f\uff1a \u5de5\u5382\u6a21\u5f0f\uff1a\u5de5\u5382\u6a21\u5f0f\u521b\u5efa\u5bf9\u8c61\u65f6\u4e0d\u6307\u5b9a\u7c7b\u3002\u5f53\u60a8\u60f3\u8981\u5728\u4e00\u4e2a\u5171\u4eab\u63a5\u53e3\u4e0b\u521b\u5efa\u5404\u79cd\u7c7b\u578b\u7684\u5bf9\u8c61\u65f6\uff0c\u5b83\u975e\u5e38\u6709\u7528\u3002\u793a\u4f8b\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b \u7c7b AnimalFactory { \u521b\u5efa\u52a8\u7269\uff08\u7c7b\u578b\uff09{ \u5f00\u5173\uff08\u7c7b\u578b\uff09{ \u6848\u4f8b\u201c\u72d7\u201d\uff1a \u8fd4\u56de\u65b0\u7684 Dog(); 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