{"id":10406,"date":"2023-11-28T21:33:22","date_gmt":"2023-11-28T13:33:22","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10406"},"modified":"2023-11-30T18:49:49","modified_gmt":"2023-11-30T10:49:49","slug":"javascript-zhong-shen-me-shi-bi-bao-2","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-shen-me-shi-bi-bao-2\/","title":{"rendered":"JavaScript \u4e2d\u4ec0\u4e48\u662f\u95ed\u5305\uff1f"},"content":{"rendered":"<p>\u95ed\u5305\uff08Closure\uff09\u662f\u6307\u51fd\u6570\u4e0e\u5176\u5305\u542b\u7684\u8bcd\u6cd5\u73af\u5883\uff08lexical environment\uff09\u7684\u7ec4\u5408\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u95ed\u5305\u662f\u6307\u53ef\u4ee5\u8bbf\u95ee\u5176\u8bcd\u6cd5\u4f5c\u7528\u57df\u5916\u90e8\u53d8\u91cf\u7684\u51fd\u6570\u3002<\/p>\n<p>\u5728 JavaScript \u4e2d\uff0c\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5b83\u88ab\u521b\u5efa\u65f6\u6240\u5904\u7684\u8bcd\u6cd5\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\uff0c\u5373\u4f7f\u51fd\u6570\u5728\u5b9a\u4e49\u4e4b\u540e\u88ab\u4f20\u9012\u5230\u5176\u4ed6\u4f5c\u7528\u57df\uff0c\u5b83\u4ecd\u7136\u53ef\u4ee5\u8bbf\u95ee\u5b9a\u4e49\u65f6\u7684\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\u3002<\/p>\n<h3><a id=\"%E7%A4%BA%E4%BE%8B%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a>\u793a\u4f8b\uff1a<\/h3>\n<pre><code class=\"language-javascript\">function outerFunction() {\n  let outerVariable = 'I am from outer';\n\n  function innerFunction() {\n    console.log(outerVariable); \/\/ \u5185\u90e8\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u51fd\u6570\u7684\u53d8\u91cf\n  }\n\n  return innerFunction;\n}\n\nconst closureFunc = outerFunction(); \/\/ \u8c03\u7528\u5916\u90e8\u51fd\u6570\uff0c\u8fd4\u56de\u5185\u90e8\u51fd\u6570\nclosureFunc(); \/\/ \u8f93\u51fa\uff1aI am from outer\n<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>outerFunction<\/code> \u5185\u90e8\u7684 <code>innerFunction<\/code> \u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u51fd\u6570 <code>outerFunction<\/code> \u4e2d\u7684 <code>outerVariable<\/code> \u53d8\u91cf\u3002\u5373\u4f7f <code>outerFunction<\/code> \u6267\u884c\u5b8c\u6bd5\uff0c<code>closureFunc<\/code> \u4ecd\u7136\u53ef\u4ee5\u8bbf\u95ee\u5e76\u4fdd\u6301\u5bf9 <code>outerVariable<\/code> \u7684\u5f15\u7528\uff0c\u5f62\u6210\u95ed\u5305\u3002<\/p>\n<p>\u95ed\u5305\u5728 JavaScript \u4e2d\u5e38\u7528\u4e8e\u4fdd\u6301\u51fd\u6570\u5185\u90e8\u7684\u72b6\u6001\uff0c\u5141\u8bb8\u51fd\u6570\u8bbf\u95ee\u5176\u8bcd\u6cd5\u4f5c\u7528\u57df\u5916\u90e8\u7684\u53d8\u91cf\uff0c\u5b9e\u73b0\u51fd\u6570\u7684\u6301\u4e45\u6027\u548c\u79c1\u6709\u6027\u3002\u5229\u7528\u95ed\u5305\uff0c\u53ef\u4ee5\u521b\u5efa\u7279\u5b9a\u60c5\u51b5\u4e0b\u7684\u79c1\u6709\u53d8\u91cf\u3001\u6a21\u5757\u5316\u548c\u67d0\u4e9b\u8bbe\u8ba1\u6a21\u5f0f\u7684\u5b9e\u73b0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u95ed\u5305\uff08Closure\uff09\u662f\u6307\u51fd\u6570\u4e0e\u5176\u5305\u542b\u7684\u8bcd\u6cd5\u73af\u5883\uff08lexical environment\uff09\u7684\u7ec4\u5408\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u95ed [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[],"class_list":["post-10406","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10406"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10406\/revisions"}],"predecessor-version":[{"id":13654,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10406\/revisions\/13654"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10406"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}