{"id":9943,"date":"2023-11-28T21:20:54","date_gmt":"2023-11-28T13:20:54","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=9943"},"modified":"2023-11-30T19:46:14","modified_gmt":"2023-11-30T11:46:14","slug":"javascript-zhong-shuo-shuo-ni-dui-zuo-yong-yu-lian","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/javascript-zhong-shuo-shuo-ni-dui-zuo-yong-yu-lian\/","title":{"rendered":"JavaScript \u4e2d\u8bf4\u8bf4\u4f60\u5bf9\u4f5c\u7528\u57df\u94fe\u7684\u7406\u89e3\uff1f"},"content":{"rendered":"

\u4f5c\u7528\u57df\u94fe\uff08Scope Chain\uff09\u662fJavaScript\u4e2d\u4e00\u79cd\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u63cf\u8ff0\u4e86\u53d8\u91cf\u548c\u51fd\u6570\u5728\u4ee3\u7801\u4e2d\u67e5\u627e\u7684\u987a\u5e8f\u4ee5\u53ca\u5b83\u4eec\u8bbf\u95ee\u7684\u8303\u56f4\u3002\u5728JavaScript\u4e2d\uff0c\u6bcf\u4e2a\u51fd\u6570\u90fd\u6709\u81ea\u5df1\u7684\u4f5c\u7528\u57df\uff0c\u5f53\u51fd\u6570\u5d4c\u5957\u65f6\uff0c\u5c31\u5f62\u6210\u4e86\u4f5c\u7528\u57df\u94fe\u3002<\/p>\n

<\/span><\/a>\u4f5c\u7528\u57df\u94fe\u7684\u5f62\u6210\u8fc7\u7a0b\uff1a<\/h3>\n
    \n
  1. \n

    \u8bcd\u6cd5\u4f5c\u7528\u57df<\/strong>\uff1a
    \nJavaScript\u4e2d\u7684\u4f5c\u7528\u57df\u94fe\u662f\u57fa\u4e8e\u8bcd\u6cd5\u4f5c\u7528\u57df\uff08\u4e5f\u79f0\u4e3a\u9759\u6001\u4f5c\u7528\u57df\uff09\u7684\uff0c\u5b83\u662f\u6839\u636e\u4ee3\u7801\u4e66\u5199\u65f6\u51fd\u6570\u5d4c\u5957\u7684\u4f4d\u7f6e\u51b3\u5b9a\u7684\uff0c\u800c\u4e0d\u662f\u51fd\u6570\u88ab\u8c03\u7528\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/li>\n

  2. \n

    \u4f5c\u7528\u57df\u5d4c\u5957<\/strong>\uff1a
    \n\u5f53\u51fd\u6570\u5728\u4ee3\u7801\u4e2d\u5d4c\u5957\u5b9a\u4e49\u65f6\uff0c\u5185\u90e8\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u51fd\u6570\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\uff0c\u8fd9\u79cd\u5d4c\u5957\u5f62\u6210\u4e86\u4f5c\u7528\u57df\u94fe\u3002<\/p>\n<\/li>\n

  3. \n

    \u53d8\u91cf\u67e5\u627e<\/strong>\uff1a
    \n\u5f53\u5728\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u53d8\u91cf\u65f6\uff0cJavaScript\u5f15\u64ce\u4f1a\u9996\u5148\u67e5\u627e\u5f53\u524d\u51fd\u6570\u7684\u4f5c\u7528\u57df\uff0c\u5982\u679c\u627e\u4e0d\u5230\uff0c\u5219\u4f1a\u5411\u4e0a\u7ea7\u4f5c\u7528\u57df\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u8be5\u53d8\u91cf\u6216\u8005\u8fbe\u5230\u5168\u5c40\u4f5c\u7528\u57df\u4e3a\u6b62\u3002<\/p>\n<\/li>\n

  4. \n

    \u4f5c\u7528\u57df\u94fe\u7ec8\u70b9<\/strong>\uff1a
    \n\u5f53\u4f5c\u7528\u57df\u94fe\u8fbe\u5230\u5168\u5c40\u4f5c\u7528\u57df\uff08\u5373\u5168\u5c40\u53d8\u91cf\u6240\u5728\u7684\u4f5c\u7528\u57df\uff09\u65f6\uff0c\u5982\u679c\u4ecd\u7136\u627e\u4e0d\u5230\u53d8\u91cf\uff0cJavaScript\u5f15\u64ce\u4f1a\u62a5\u9519\uff08ReferenceError\uff09\u3002<\/p>\n<\/li>\n<\/ol>\n

    <\/span><\/a>\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1a<\/h3>\n
    let globalVar = "Global";\n\nfunction outerFunction() {\n  let outerVar = "Outer";\n  \n  function innerFunction() {\n    let innerVar = "Inner";\n    console.log(innerVar); \/\/ \u8bbf\u95ee\u5185\u90e8\u53d8\u91cf\n    console.log(outerVar); \/\/ \u8bbf\u95ee\u5916\u90e8\u51fd\u6570\u4e2d\u7684\u53d8\u91cf\n    console.log(globalVar); \/\/ \u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\n  }\n  \n  innerFunction();\n}\n\nouterFunction();\n<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cinnerFunction<\/code> \u5185\u90e8\u53ef\u4ee5\u8bbf\u95ee\u81ea\u8eab\u4f5c\u7528\u57df\u4e2d\u7684 innerVar<\/code> \u53d8\u91cf\uff0c\u5916\u90e8\u51fd\u6570 outerFunction<\/code> \u4e2d\u7684 outerVar<\/code> \u53d8\u91cf\uff0c\u4ee5\u53ca\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 globalVar<\/code> \u53d8\u91cf\u3002\u8fd9\u4e9b\u53d8\u91cf\u7684\u67e5\u627e\u987a\u5e8f\u5c31\u6784\u6210\u4e86\u4f5c\u7528\u57df\u94fe\u3002<\/p>\n
    \u4f5c\u7528\u57df\u94fe\u7684\u7406\u89e3\u5bf9\u4e8e\u7406\u89e3JavaScript\u4e2d\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u548c\u8bbf\u95ee\u89c4\u5219\u975e\u5e38\u91cd\u8981\uff0c\u6709\u52a9\u4e8e\u907f\u514d\u53d8\u91cf\u51b2\u7a81\u3001\u7406\u89e3\u95ed\u5305\u7684\u5de5\u4f5c\u539f\u7406\u7b49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u4f5c\u7528\u57df\u94fe\uff08Scope Chain\uff09\u662fJavaScript\u4e2d\u4e00\u79cd\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u63cf\u8ff0\u4e86\u53d8\u91cf\u548c\u51fd\u6570\u5728\u4ee3\u7801\u4e2d\u67e5\u627e\u7684\u987a\u5e8f […]<\/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-9943","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9943","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=9943"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9943\/revisions"}],"predecessor-version":[{"id":13691,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/9943\/revisions\/13691"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=9943"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=9943"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=9943"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}