{"id":155218,"date":"2024-05-08T11:48:37","date_gmt":"2024-05-08T03:48:37","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/155218.html"},"modified":"2024-05-08T11:48:42","modified_gmt":"2024-05-08T03:48:42","slug":"%e7%a7%bb%e5%8a%a8%e7%ab%af-javascript-%e9%a1%b9%e7%9b%ae%e4%b8%ad%e5%a6%82%e4%bd%95%e7%94%a8-let-%e5%a3%b0%e6%98%8e%e5%8f%98%e9%87%8f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/155218.html","title":{"rendered":"\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\u5982\u4f55\u7528 let \u58f0\u660e\u53d8\u91cf"},"content":{"rendered":"

\"\u79fb\u52a8\u7aef<\/p>\n

\u5728\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\u4f7f\u7528 let<\/code> \u58f0\u660e\u53d8\u91cf\u80fd\u591f\u5e26\u6765\u8bf8\u591a\u597d\u5904\uff0c\u5176\u4e2d\u5305\u62ec\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3001\u9632\u6b62\u53d8\u91cf\u63d0\u5347\u5bfc\u81f4\u7684\u9519\u8bef\u3001\u521b\u5efa\u5757\u7ea7\u4f5c\u7528\u57df<\/strong>\u3002\u8fd9\u4e9b\u4f18\u52bf\u4f7f\u5f97let<\/code>\u6210\u4e3a\u73b0\u4ee3 JavaScript \u5f00\u53d1\u4e2d\u63a8\u8350\u4f7f\u7528\u7684\u53d8\u91cf\u58f0\u660e\u65b9\u5f0f\u3002\u5c24\u5176\u662f\u5728\u521b\u5efa\u5757\u7ea7\u4f5c\u7528\u57df\u8fd9\u4e00\u70b9\u4e0a\uff0clet<\/code>\u76f8\u6bd4\u4f20\u7edf\u7684var<\/code>\u58f0\u660e\u65b9\u5f0f\u5c55\u73b0\u51fa\u4e86\u663e\u8457\u7684\u4f18\u52bf\u3002\u5728\u4f7f\u7528var<\/code>\u58f0\u660e\u53d8\u91cf\u65f6\uff0c\u53d8\u91cf\u4f1a\u88ab\u63d0\u5347\u5230\u51fd\u6570\u6216\u5168\u5c40\u4f5c\u7528\u57df\u7684\u6700\u9876\u90e8\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4e00\u4e9b\u610f\u6599\u4e4b\u5916\u7684\u95ee\u9898\u3002\u800clet<\/code>\u5219\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u4e00\u4e2a\u5177\u4f53\u7684\u5757\u7ea7\u4f5c\u7528\u57df\u5185\u58f0\u660e\u53d8\u91cf\uff0c\u5927\u5927\u51cf\u5c11\u4e86\u7531\u4e8e\u53d8\u91cf\u63d0\u5347\u5f15\u8d77\u7684\u9519\u8bef\uff0c\u8ba9\u4ee3\u7801\u7684\u884c\u4e3a\u66f4\u52a0\u7b26\u5408\u76f4\u89c9\u3002<\/p>\n<\/p>\n

I\u3001\u4e86\u89e3let<\/code>\u7684\u57fa\u672c\u7279\u6027<\/h3>\n<\/p>\n

let<\/code>\u662fES6\uff08ECMAScript 2015\uff09\u5f15\u5165\u7684\u65b0\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u58f0\u660e\u53d8\u91cf\u3002\u4e0e\u4f20\u7edf\u7684var<\/code>\u76f8\u6bd4\uff0clet<\/code>\u63d0\u4f9b\u4e86\u5757\u7ea7\u4f5c\u7528\u57df\uff08block scope\uff09\u7684\u6982\u5ff5\uff0c\u8fd9\u610f\u5473\u7740\u4f7f\u7528let<\/code>\u58f0\u660e\u7684\u53d8\u91cf\u4ec5\u5728\u5176\u58f0\u660e\u7684\u4ee3\u7801\u5757\u5185\u6709\u6548\u3002<\/p>\n<\/p>\n

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II\u3001\u5728\u5faa\u73af\u4e2d\u4f7f\u7528let<\/code><\/h3>\n<\/p>\n

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III\u3001\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\u4f7f\u7528let<\/code><\/h3>\n<\/p>\n

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IV\u3001let<\/code>\u5728\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u7684\u4f7f\u7528<\/h3>\n<\/p>\n

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V\u3001let<\/code>\u4e0econst<\/code>\u7684\u642d\u914d\u4f7f\u7528<\/h3>\n<\/p>\n

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

1. \u7528 let \u58f0\u660e\u53d8\u91cf\u7684\u597d\u5904\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n

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\u6700\u540e\uff0c\u4f7f\u7528 let \u58f0\u660e\u7684\u53d8\u91cf\u662f\u5757\u7ea7\u7ed1\u5b9a\uff0c\u610f\u5473\u7740\u4f60\u53ef\u4ee5\u5728\u540c\u4e00\u5757\u4e2d\u591a\u6b21\u4f7f\u7528\u76f8\u540c\u7684\u53d8\u91cf\u540d\uff0c\u800c\u4e0d\u4f1a\u5f15\u8d77\u51b2\u7a81\u3002\u8fd9\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u6a21\u5757\u5316\u548c\u53ef\u7ef4\u62a4\u3002<\/p>\n

2. \u5728\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\uff0c\u4e3a\u4f55\u8981\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\uff1f<\/strong><\/p>\n

\u5728\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\uff0c\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5199\u51fa\u66f4\u5065\u58ee\u3001\u53ef\u8bfb\u6027\u66f4\u9ad8\u7684\u4ee3\u7801\u3002\u7531\u4e8e\u79fb\u52a8\u8bbe\u5907\u7684\u6027\u80fd\u548c\u8d44\u6e90\u6709\u9650\uff0c\u6211\u4eec\u9700\u8981\u66f4\u5c0f\u5fc3\u5730\u7ba1\u7406\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u548c\u751f\u547d\u5468\u671f\u3002<\/p>\n

\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\u53ef\u4ee5\u4f7f\u6211\u4eec\u7684\u4ee3\u7801\u66f4\u5177\u53ef\u7ef4\u62a4\u6027\u3002\u53d8\u91cf\u7684\u4f5c\u7528\u8303\u56f4\u88ab\u9650\u5236\u5728\u66f4\u5c0f\u7684\u5757\u5185\uff0c\u51cf\u5c11\u4e86\u53d8\u91cf\u7684\u53ef\u89c1\u6027\uff0c\u4ece\u800c\u964d\u4f4e\u4e86\u5f15\u8d77\u9519\u8bef\u548c\u51b2\u7a81\u7684\u6982\u7387\u3002\u6b64\u5916\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4ee3\u7801\u7684\u5757\u5185\u90e8\u58f0\u660e\u53d8\u91cf\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u6e05\u6670\u548c\u6613\u4e8e\u7406\u89e3\u3002<\/p>\n

3. \u5728\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\uff0c\u4f55\u65f6\u5e94\u8be5\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\uff1f<\/strong><\/p>\n

\u5728\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\uff0c\u6211\u4eec\u5e94\u8be5\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\uff1a<\/p>\n

    \n
  • \n

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  • \n

    \u5f53\u6211\u4eec\u9700\u8981\u907f\u514d\u53d8\u91cf\u58f0\u660e\u63d0\u5347\u7684\u60c5\u51b5\u65f6\u3002\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\u53ef\u4ee5\u786e\u4fdd\u6211\u4eec\u5c06\u53d8\u91cf\u58f0\u660e\u653e\u5728\u4f7f\u7528\u4e4b\u524d\uff0c\u589e\u52a0\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/li>\n

  • \n

    \u5f53\u6211\u4eec\u60f3\u8981\u5728\u540c\u4e00\u5757\u4e2d\u591a\u6b21\u4f7f\u7528\u76f8\u540c\u7684\u53d8\u91cf\u540d\u65f6\u3002\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\u53ef\u4ee5\u907f\u514d\u547d\u540d\u51b2\u7a81\uff0c\u4f7f\u4ee3\u7801\u66f4\u5177\u6a21\u5757\u5316\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n<\/li>\n<\/ul>\n

    \u603b\u4e4b\uff0c\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7ba1\u7406\u53d8\u91cf\u4f5c\u7528\u57df\u548c\u751f\u547d\u5468\u671f\uff0c\u5199\u51fa\u66f4\u52a0\u5065\u58ee\u548c\u53ef\u8bfb\u6027\u66f4\u9ad8\u7684\u79fb\u52a8\u7aef JavaScript \u4ee3\u7801\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728\u79fb\u52a8\u7aef JavaScript \u9879\u76ee\u4e2d\u4f7f\u7528 let \u58f0\u660e\u53d8\u91cf\u80fd\u591f\u5e26\u6765\u8bf8\u591a\u597d\u5904\uff0c\u5176\u4e2d\u5305\u62ec\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4 […]","protected":false},"author":3,"featured_media":155226,"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\/155218"}],"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=155218"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/155218\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/155226"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=155218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=155218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=155218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}