{"id":52529,"date":"2024-12-03T16:30:43","date_gmt":"2024-12-03T08:30:43","guid":{"rendered":"https:\/\/fwq.ai\/blog\/52529\/"},"modified":"2024-12-03T16:30:43","modified_gmt":"2024-12-03T08:30:43","slug":"javascript-%e4%b8%ad%e7%9a%84%e9%97%ad%e5%8c%85%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%8f%98%e9%87%8f%e5%9c%a8%e5%87%bd%e6%95%b0%e6%89%a7%e8%a1%8c%e5%90%8e%e4%bb%8d%e7%84%b6%e5%8f%af%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/52529\/","title":{"rendered":"JavaScript \u4e2d\u7684\u95ed\u5305\uff1a\u4e3a\u4ec0\u4e48\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u540e\u4ecd\u7136\u53ef\u7528\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

JavaScript \u4e2d\u7684\u95ed\u5305\uff1a\u4e3a\u4ec0\u4e48\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u540e\u4ecd\u7136\u53ef\u7528\uff1f<\/h1>\n

\u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300aJavaScript \u4e2d\u7684\u95ed\u5305\uff1a\u4e3a\u4ec0\u4e48\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u540e\u4ecd\u7136\u53ef\u7528\uff1f\u300b<\/span>\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9\u6587\u7ae0<\/span>\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span>\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01<\/p>\n

\"JavaScript<\/p>\n

\u95ed\u5305\u5728 javascript \u4e2d\u7684\u795e\u79d8\u4e4b\u5904<\/strong><\/p>\n

\u5728 javascript \u4e2d\uff0c\u95ed\u5305\u662f\u4e00\u4e2a\u8ba9\u8bb8\u591a\u521d\u5b66\u8005\u56f0\u60d1\u7684\u6982\u5ff5\u3002\u5f53\u53d8\u91cf\u5728\u6267\u884c\u51fd\u6570\u540e\u4ecd\u7136\u53ef\u7528\u65f6\uff0c\u95ed\u5305\u5c31\u4f1a\u5f62\u6210\u3002<\/p>\n

\u8ba9\u6211\u4eec\u6df1\u5165\u7814\u7a76\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n

function fn() {\n  var num = 3;\n  return function() {\n      var n = 0;\n      n++;\n      num++;\n      console.log('n=' + n);\n      console.log('num=' + num);\n  }\n}\n\nvar fn1 = fn();\nfn1(); \/\/ 1 4\nconsole.log(\"------\");\nfn1(); \/\/ 1 5<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f60\u4f1a\u6ce8\u610f\u5230\u53d8\u91cf num \u5728\u7b2c\u4e00\u6b21\u6267\u884c fn \u51fd\u6570\u540e\u4e0d\u4f1a\u88ab\u9500\u6bc1\u3002\u8fd9\u5bfc\u81f4\u6bcf\u6b21\u8c03\u7528 fn1 \u65f6 num \u4f1a\u7d2f\u79ef\uff0c\u800c n \u4f1a\u91cd\u65b0\u521d\u59cb\u5316\u3002<\/p>\n
\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\u662f\u56e0\u4e3a fn1 \u662f\u4e00\u4e2a\u95ed\u5305\uff0c\u5b83\u53ef\u4ee5\u8bbf\u95ee\u7236\u51fd\u6570 fn \u7684\u5185\u90e8\u53d8\u91cf num\u3002\u5373\u4f7f fn \u51fd\u6570\u5df2\u7ecf\u6267\u884c\u5b8c\u6bd5\uff0c\u95ed\u5305\u7684\u7279\u6027\u4e5f\u4f1a\u4fdd\u7559\u5176\u53d8\u91cf\uff0c\u76f4\u5230\u4e0d\u518d\u88ab\u5f15\u7528\u3002<\/p>\n
\u56e0\u6b64\uff0c\u5728 javascript \u4e2d\uff0c\u95ed\u5305\u5141\u8bb8\u51fd\u6570\u8bbf\u95ee\u5176\u5916\u90e8\u4f5c\u7528\u57df\u7684\u53d8\u91cf\uff0c\u5373\u4f7f\u8be5\u4f5c\u7528\u57df\u5df2\u7ecf\u7ed3\u675f\u4e86\u3002\u8fd9\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u7075\u6d3b\u6027\uff0c\u4f46\u5982\u679c\u4e0d\u4ed4\u7ec6\u4f7f\u7528\uff0c\u4e5f\u53ef\u80fd\u5bfc\u81f4\u610f\u60f3\u4e0d\u5230\u7684\u884c\u4e3a\uff0c\u4f8b\u5982\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n
\u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u95ed\u5305\uff0c\u53ef\u4ee5\u53c2\u8003\u962e\u4e00\u5cf0\u7684\u6df1\u5165\u6587\u7ae0\uff1a\u201c\u5b66\u4e60javascript\u95ed\u5305\uff08closure\uff09\u201d\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aJavaScript \u4e2d\u7684\u95ed\u5305\uff1a\u4e3a\u4ec0\u4e48\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u540e\u4ecd\u7136\u53ef\u7528\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n
\n
<\/dt>\n
\n   \u6700\u4f73\u7535\u8111\u70ed\u70b9\u8f6f\u4ef6\u63a8\u8350\uff1a\u8f7b\u677e\u5171\u4eab\u7f51\u7edc\u8fde\u63a5\u7684\u89e3\u51b3\u65b9\u6848\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
JavaScript \u4e2d\u7684\u95ed\u5305\uff1a\u4e3a\u4ec0\u4e48\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u540e\u4ecd\u7136\u53ef\u7528\uff1f \u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300aJavaScript \u4e2d\u7684\u95ed\u5305\uff1a\u4e3a\u4ec0\u4e48\u53d8\u91cf\u5728\u51fd\u6570\u6267\u884c\u540e\u4ecd\u7136\u53ef\u7528\uff1f\u300b\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9\u6587\u7ae0\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01 \u95ed\u5305\u5728 javascript \u4e2d\u7684\u795e\u79d8\u4e4b\u5904 \u5728 javascript \u4e2d\uff0c\u95ed\u5305\u662f\u4e00\u4e2a\u8ba9\u8bb8\u591a\u521d\u5b66\u8005\u56f0\u60d1\u7684\u6982\u5ff5\u3002\u5f53\u53d8\u91cf\u5728\u6267\u884c\u51fd\u6570\u540e\u4ecd\u7136\u53ef\u7528\u65f6\uff0c\u95ed\u5305\u5c31\u4f1a\u5f62\u6210\u3002 \u8ba9\u6211\u4eec\u6df1\u5165\u7814\u7a76\u4e00\u4e2a\u793a\u4f8b\uff1a function fn() { var num = 3; return function() { var n = 0; n++; num++; console.log(‘n=’ + n); console.log(‘num=’ + num); } } var fn1 = fn(); fn1(); \/\/ 1 4 console.log(“——“); fn1(); \/\/ 1 5 \u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4f60\u4f1a\u6ce8\u610f\u5230\u53d8\u91cf num \u5728\u7b2c\u4e00\u6b21\u6267\u884c fn \u51fd\u6570\u540e\u4e0d\u4f1a\u88ab\u9500\u6bc1\u3002\u8fd9\u5bfc\u81f4\u6bcf\u6b21\u8c03\u7528 fn1 \u65f6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-52529","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52529","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=52529"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/52529\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=52529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=52529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=52529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}