{"id":235091,"date":"2024-05-12T10:12:33","date_gmt":"2024-05-12T02:12:33","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/235091.html"},"modified":"2024-05-12T10:12:41","modified_gmt":"2024-05-12T02:12:41","slug":"javascript%e6%98%af%e5%a6%82%e4%bd%95%e9%ab%98%e6%95%88%e7%9a%84%e8%ae%bf%e9%97%ae%e5%af%b9%e8%b1%a1%e5%b1%9e%e6%80%a7%e7%9a%84-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/235091.html","title":{"rendered":"JavaScript\u662f\u5982\u4f55\u9ad8\u6548\u7684\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u7684"},"content":{"rendered":"

\"JavaScript\u662f\u5982\u4f55\u9ad8\u6548\u7684\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u7684\"<\/p>\n

JavaScript\u9ad8\u6548\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u7684\u6838\u5fc3\u5728\u4e8e\u5176\u52a8\u6001\u5c5e\u6027\u8bbf\u95ee\u673a\u5236\u3001\u539f\u578b\u94fe\u67e5\u627e\u673a\u5236<\/strong>\u548c\u5185\u90e8\u4f18\u5316\u7b56\u7565<\/strong>\uff0c\u5176\u4e2d\u52a8\u6001\u5c5e\u6027\u8bbf\u95ee\u673a\u5236<\/strong>\u5141\u8bb8JavaScript\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u6dfb\u52a0\u3001\u8bbf\u95ee\u548c\u5220\u9664\u5bf9\u8c61\u7684\u5c5e\u6027\u3002\u8fd9\u79cd\u7075\u6d3b\u6027\u867d\u5e26\u6765\u4fbf\u5229\uff0c\u4f46\u4e5f\u8981\u6c42JavaScript\u5f15\u64ce\u91c7\u7528\u9ad8\u6548\u7684\u5185\u90e8\u673a\u5236\u6765\u7ba1\u7406\u548c\u8bbf\u95ee\u8fd9\u4e9b\u5c5e\u6027\uff0c\u4ee5\u4fdd\u6301\u6027\u80fd\u3002<\/p>\n<\/p>\n

\u52a8\u6001\u5c5e\u6027\u8bbf\u95ee\u673a\u5236<\/strong><\/h3>\n<\/p>\n

JavaScript\u5bf9\u8c61\u662f\u4e00\u79cd\u7075\u6d3b\u7684\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u6dfb\u52a0\u3001\u4fee\u6539\u6216\u5220\u9664\u5c5e\u6027\u3002\u8fd9\u79cd\u7279\u6027\u6765\u81ea\u4e8eJavaScript\u7684\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\u7684\u672c\u8d28\uff0c\u5bf9\u8c61\u5c5e\u6027\u7684\u5b58\u50a8\u548c\u8bbf\u95ee\u91c7\u7528\u540d\/\u503c\u5bf9\u7684\u65b9\u5f0f\u3002\u5f53\u4f60\u8bbf\u95ee\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u65f6\uff0cJavaScript\u5f15\u64ce\u4f1a\u9996\u5148\u68c0\u67e5\u5bf9\u8c61\u81ea\u8eab\u662f\u5426\u5305\u542b\u8fd9\u4e2a\u5c5e\u6027\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u5219\u4f1a\u7ee7\u7eed\u5728\u8be5\u5bf9\u8c61\u7684\u539f\u578b\u94fe\u4e0a\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u8be5\u5c5e\u6027\u6216\u5230\u8fbe\u539f\u578b\u94fe\u7684\u672b\u7aef\u3002<\/p>\n<\/p>\n

\u52a8\u6001\u5c5e\u6027\u8bbf\u95ee\u662f\u901a\u8fc7\u6563\u5217\u8868\uff08\u4e5f\u79f0\u4e3a\u54c8\u5e0c\u8868\u6216\u5b57\u5178\uff09\u6765\u5b9e\u73b0\u7684\uff0c\u8fd9\u662f\u4e00\u79cd\u80fd\u591f\u63d0\u4f9b\u5feb\u901f\u8bbf\u95ee\u6570\u636e\u7684\u6570\u636e\u7ed3\u6784\u3002\u6bcf\u4e2aJavaScript\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a\u4e0e\u4e4b\u5bf9\u5e94\u7684\u6563\u5217\u8868\u6765\u5b58\u50a8\u5c5e\u6027\u540d\u548c\u5c5e\u6027\u503c\u7684\u6620\u5c04\u3002\u5f53\u8bbf\u95ee\u4e00\u4e2a\u5c5e\u6027\u65f6\uff0c\u5f15\u64ce\u901a\u8fc7\u6563\u5217\u51fd\u6570\u5feb\u901f\u5b9a\u4f4d\u5230\u5c5e\u6027\u503c\uff0c\u8fd9\u5927\u5927\u52a0\u5feb\u4e86\u5c5e\u6027\u8bbf\u95ee\u901f\u5ea6\u3002<\/p>\n<\/p>\n

\u539f\u578b\u94fe\u67e5\u627e\u673a\u5236<\/strong><\/h3>\n<\/p>\n

\u5728JavaScript\u4e2d\uff0c\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a\u539f\u578b\u5bf9\u8c61\uff0c\u5bf9\u8c61\u7684\u5c5e\u6027\u8bbf\u95ee\u53ef\u4ee5\u6cbf\u7740\u539f\u578b\u94fe\u5411\u4e0a\u5c42\u67e5\u627e\u3002\u5f53\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u65f6\uff0c\u5982\u679c\u5bf9\u8c61\u672c\u8eab\u6ca1\u6709\u8fd9\u4e2a\u5c5e\u6027\uff0cJavaScript\u4f1a\u7ee7\u7eed\u5728\u8be5\u5bf9\u8c61\u7684\u539f\u578b\u4e0a\u67e5\u627e\u8fd9\u4e2a\u5c5e\u6027\uff0c\u8fd9\u4e00\u8fc7\u7a0b\u4f1a\u4e00\u76f4\u6301\u7eed\u5230\u627e\u5230\u76f8\u5e94\u7684\u5c5e\u6027\u6216\u5230\u8fbe\u539f\u578b\u94fe\u7684\u672b\u7aef\uff08null\uff09\u3002<\/p>\n<\/p>\n

\u539f\u578b\u94fe\u67e5\u627e\u673a\u5236\u786e\u4fdd\u4e86\u5373\u4f7f\u662f\u7ee7\u627f\u5c5e\u6027\u4e5f\u80fd\u88ab\u9ad8\u6548\u5730\u8bbf\u95ee\u3002\u867d\u7136\u8fd9\u79cd\u67e5\u627e\u673a\u5236\u53ef\u80fd\u76f8\u6bd4\u76f4\u63a5\u8bbf\u95ee\u5bf9\u8c61\u81ea\u6709\u5c5e\u6027\u7a0d\u6162\uff0c\u4f46\u901a\u8fc7\u4f18\u5316\u539f\u578b\u94fe\u7684\u957f\u5ea6\u548c\u7ed3\u6784\uff0c\u4ee5\u53ca\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u539f\u578b\u94fe\u67e5\u627e\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u5c5e\u6027\u7684\u8bbf\u95ee\u6548\u7387\u3002<\/p>\n<\/p>\n

\u5185\u90e8\u4f18\u5316\u7b56\u7565<\/strong><\/h3>\n<\/p>\n

JavaScript\u5f15\u64ce\uff08\u5982V8\u3001SpiderMonkey\u7b49\uff09\u91c7\u7528\u4e86\u591a\u79cd\u5185\u90e8\u4f18\u5316\u7b56\u7565\u6765\u63d0\u9ad8\u5bf9\u8c61\u5c5e\u6027\u7684\u8bbf\u95ee\u901f\u5ea6\u3002\u5176\u4e2d\u4e4b\u4e00\u662f\u9690\u85cf\u7c7b\uff08Hidden Classes\uff09\u548c<\/strong>\u5185\u8054\u7f13\u5b58\uff08Inline Caching\uff09<\/strong>\u3002<\/p>\n<\/p>\n

    \n
  • \n

    \u9690\u85cf\u7c7b<\/strong>\uff1a\u5c3d\u7ba1JavaScript\u662f\u4e00\u79cd\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\uff0c\u4f46\u4e3a\u4e86\u4f18\u5316\u5c5e\u6027\u8bbf\u95ee\uff0c\u73b0\u4ee3JavaScript\u5f15\u64ce\u4f1a\u4e3a\u76f8\u4f3c\u7ed3\u6784\u7684\u5bf9\u8c61\u521b\u5efa\u9690\u85cf\u7c7b\u3002\u8fd9\u4e9b\u9690\u85cf\u7c7b\u5e2e\u52a9\u5f15\u64ce\u5feb\u901f\u786e\u5b9a\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u7684\u5e03\u5c40\uff0c\u4ece\u800c\u52a0\u901f\u5c5e\u6027\u8bbf\u95ee\u548c\u4fee\u6539\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<\/li>\n

  • \n

    \u5185\u8054\u7f13\u5b58<\/strong>\uff1a\u5185\u8054\u7f13\u5b58\u662f\u4e00\u79cd\u8fd0\u884c\u65f6\u4f18\u5316\u6280\u672f\uff0c\u5b83\u7f13\u5b58\u4e86\u5bf9\u8c61\u5c5e\u6027\u8bbf\u95ee\u7684\u7ed3\u679c\u3002\u5f53\u540c\u4e00\u4e2a\u5c5e\u6027\u88ab\u53cd\u590d\u8bbf\u95ee\u65f6\uff0c\u5f15\u64ce\u53ef\u4ee5\u76f4\u63a5\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u7ed3\u679c\uff0c\u800c\u4e0d\u662f\u6bcf\u6b21\u90fd\u91cd\u65b0\u67e5\u627e\uff0c\u8fd9\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u5c5e\u6027\u8bbf\u95ee\u7684\u901f\u5ea6\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

    \u901a\u8fc7\u8fd9\u4e9b\u5185\u90e8\u4f18\u5316\u7b56\u7565\uff0cJavaScript\u53ef\u4ee5\u5728\u4fdd\u6301\u8bed\u8a00\u52a8\u6001\u7279\u6027\u7684\u540c\u65f6\uff0c\u5b9e\u73b0\u9ad8\u6548\u7684\u5bf9\u8c61\u5c5e\u6027\u8bbf\u95ee\u3002<\/p>\n<\/p>\n

    \u7ed3\u8bba<\/strong><\/h3>\n<\/p>\n

    JavaScript\u901a\u8fc7\u5176\u52a8\u6001\u5c5e\u6027\u8bbf\u95ee\u673a\u5236\u3001\u539f\u578b\u94fe\u67e5\u627e\u673a\u5236\u548c\u5148\u8fdb\u7684\u5185\u90e8\u4f18\u5316\u7b56\u7565\uff0c\u5b9e\u73b0\u4e86\u5bf9\u8c61\u5c5e\u6027\u7684\u9ad8\u6548\u8bbf\u95ee\u3002\u867d\u7136\u4ece\u8868\u9762\u4e0a\u770b\uff0c\u52a8\u6001\u7c7b\u578b\u548c\u539f\u578b\u7ee7\u627f\u4f3c\u4e4e\u4f1a\u4f7f\u5c5e\u6027\u8bbf\u95ee\u53d8\u6162\uff0c\u4f46\u5f97\u76ca\u4e8e\u73b0\u4ee3JavaScript\u5f15\u64ce\u7684\u9ad8\u5ea6\u4f18\u5316\uff0c\u8fd9\u4e9b\u7279\u6027\u4e0d\u4ec5\u63d0\u4f9b\u4e86\u6781\u5927\u7684\u7075\u6d3b\u6027\u548c\u8868\u8fbe\u80fd\u529b\uff0c\u540c\u65f6\u4e5f\u786e\u4fdd\u4e86\u8bbf\u95ee\u901f\u5ea6\u3002\u7406\u89e3\u8fd9\u4e9b\u673a\u5236\u548c\u4f18\u5316\u6280\u672f\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6027\u80fdJavaScript\u4ee3\u7801\u6709\u7740\u91cd\u8981\u7684\u5b9e\u8df5\u610f\u4e49\u3002<\/p>\n<\/p>\n

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

    1. \u4e3a\u4ec0\u4e48JavaScript\u80fd\u591f\u9ad8\u6548\u5730\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\uff1f<\/strong><\/p>\n

    JavaScript\u80fd\u591f\u9ad8\u6548\u5730\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u662f\u56e0\u4e3a\u5b83\u4f7f\u7528\u4e86\u54c8\u5e0c\u8868\u6765\u5b58\u50a8\u5bf9\u8c61\u7684\u5c5e\u6027\u3002\u54c8\u5e0c\u8868\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u4ee5\u5e38\u6570\u65f6\u95f4\u590d\u6742\u5ea6\uff08O(1)\uff09\u7684\u65b9\u5f0f\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u3002\u5f53\u6211\u4eec\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u65f6\uff0cJavaScript\u4f1a\u81ea\u52a8\u5c06\u5c5e\u6027\u540d\u8f6c\u6362\u4e3a\u54c8\u5e0c\u503c\uff0c\u5e76\u6839\u636e\u54c8\u5e0c\u503c\u5728\u54c8\u5e0c\u8868\u4e2d\u627e\u5230\u5bf9\u5e94\u7684\u5c5e\u6027\u503c\u3002<\/p>\n

    2. \u54ea\u4e9b\u56e0\u7d20\u5f71\u54cdJavaScript\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u7684\u6548\u7387\uff1f<\/strong><\/p>\n

    \u867d\u7136JavaScript\u80fd\u591f\u9ad8\u6548\u5730\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\uff0c\u4f46\u4ecd\u7136\u6709\u4e00\u4e9b\u56e0\u7d20\u4f1a\u5f71\u54cd\u5176\u6548\u7387\u3002\u5176\u4e2d\u4e00\u4e2a\u56e0\u7d20\u662f\u5bf9\u8c61\u7684\u5c5e\u6027\u6570\u91cf\u3002\u5f53\u5bf9\u8c61\u7684\u5c5e\u6027\u6570\u91cf\u8f83\u591a\u65f6\uff0c\u54c8\u5e0c\u8868\u9700\u8981\u5904\u7406\u66f4\u591a\u7684\u54c8\u5e0c\u51b2\u7a81\uff0c\u4ece\u800c\u964d\u4f4e\u4e86\u8bbf\u95ee\u5c5e\u6027\u7684\u6548\u7387\u3002\u6b64\u5916\uff0c\u5bf9\u8c61\u7684\u5c5e\u6027\u6df1\u5ea6\u4e5f\u4f1a\u5f71\u54cd\u8bbf\u95ee\u6548\u7387\u3002\u5f53\u5c5e\u6027\u5d4c\u5957\u8f83\u6df1\u65f6\uff0cJavaScript\u9700\u8981\u8fdb\u884c\u591a\u6b21\u5c5e\u6027\u67e5\u627e\uff0c\u4ece\u800c\u589e\u52a0\u4e86\u8bbf\u95ee\u5c5e\u6027\u7684\u65f6\u95f4\u3002<\/p>\n

    3. JavaScript\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u7684\u6548\u7387\u548c\u4ee3\u7801\u7f16\u5199\u6709\u4ec0\u4e48\u5173\u7cfb\uff1f<\/strong><\/p>\n

    \u867d\u7136JavaScript\u7684\u54c8\u5e0c\u8868\u80fd\u591f\u9ad8\u6548\u5730\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\uff0c\u4f46\u6211\u4eec\u5728\u7f16\u5199\u4ee3\u7801\u65f6\u4ecd\u7136\u9700\u8981\u6ce8\u610f\u4e00\u4e9b\u7ec6\u8282\uff0c\u4ee5\u786e\u4fdd\u8bbf\u95ee\u5c5e\u6027\u7684\u6548\u7387\u3002\u4e00\u79cd\u5e38\u89c1\u7684\u4f18\u5316\u65b9\u6cd5\u662f\u901a\u8fc7\u7f13\u5b58\u5bf9\u8c61\u7684\u5c5e\u6027\u8bbf\u95ee\u8def\u5f84\uff0c\u907f\u514d\u591a\u6b21\u8bbf\u95ee\u540c\u4e00\u4e2a\u5c5e\u6027\u3002\u53e6\u5916\uff0c\u907f\u514d\u9891\u7e41\u5730\u4fee\u6539\u5bf9\u8c61\u7684\u5c5e\u6027\u7ed3\u6784\u4e5f\u53ef\u4ee5\u63d0\u9ad8\u8bbf\u95ee\u6548\u7387\u3002\u5728\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u65f6\uff0c\u5c3d\u91cf\u4f7f\u7528\u70b9\u7b26\u53f7\uff08.\uff09\u800c\u4e0d\u662f\u65b9\u62ec\u53f7\uff08[]\uff09\uff0c\u56e0\u4e3a\u70b9\u7b26\u53f7\u8bbf\u95ee\u5c5e\u6027\u7684\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript\u9ad8\u6548\u8bbf\u95ee\u5bf9\u8c61\u5c5e\u6027\u7684\u6838\u5fc3\u5728\u4e8e\u5176\u52a8\u6001\u5c5e\u6027\u8bbf\u95ee\u673a\u5236\u3001\u539f\u578b\u94fe\u67e5\u627e\u673a\u5236\u548c\u5185\u90e8\u4f18\u5316\u7b56\u7565\uff0c\u5176\u4e2d\u52a8\u6001\u5c5e\u6027\u8bbf […]","protected":false},"author":3,"featured_media":235096,"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\/235091"}],"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=235091"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/235091\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/235096"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=235091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=235091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=235091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}