{"id":116826,"date":"2026-10-22T06:24:37","date_gmt":"2026-10-21T22:24:37","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/116826.html"},"modified":"2026-10-22T06:24:37","modified_gmt":"2026-10-21T22:24:37","slug":"%e7%88%ac%e8%99%ab%e9%80%86%e8%a1%8c3-%e5%8e%9f%e5%9e%8b%e4%b8%8e%e5%8e%9f%e5%9e%8b%e9%93%be","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/116826.html","title":{"rendered":"\u722c\u866b\u9006\u884c(3)-\u539f\u578b\u4e0e\u539f\u578b\u94fe"},"content":{"rendered":"

\u722c\u866b\u9006\u884c(3)-\u539f\u578b\u4e0e\u539f\u578b\u94fe<\/h2>\n
\n

\u524d\u8a00<\/h6>\n

\u5728\u6d4f\u89c8\u5668\u91cc\u9762，\u53ef\u4ee5\u628a\u539f\u578b\u770b\u6210\u6d4f\u89c8\u5668\u5185\u7f6e\u5bf9\u8c61\u7684\u521b\u5efa\u7c7b，\u539f\u578b\u94fe\u6307\u7684\u662f\u521b\u5efa\u7684\u7c7b\u548c\u5b83\u7684\u7236\u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb
\n\u6d4f\u89c8\u5668\u5185\u7f6e\u5bf9\u8c61\u62e5\u6709\u56fa\u5b9a\u539f\u751f\u539f\u578b\u94fe\u7ed3\u6784，\u53cd\u722c\u4f1a\u68c0\u6d4b\u5bf9\u8c61\u4e4b\u95f4\u7684\u539f\u578b\u5f15\u7528\u94fe\u6761，\u539f\u578b\u4e0a\u7684\u5c5e\u6027，\u5bf9\u6bd4\u6807\u51c6\u6d4f\u89c8\u5668\u7279\u5f81；\u722c\u866b\u5de5\u5177\u5f80\u5f80\u4f1a\u7be1\u6539\u539f\u578b\u94fe，\u91cd\u5199\u539f\u751f\u539f\u578b\u65b9\u6cd5，\u4e00\u65e6\u6821\u9a8c\u4e0d\u5339\u914d，\u5c31\u4f1a\u88ab\u8bc6\u522b\u4e3a\u722c\u866b<\/p>\n

\u5b66\u4e60\u539f\u578b\u4e0e\u539f\u578b\u94fe\u4e4b\u524d\u6211\u4eec\u5148\u4e86\u89e3\u4e00\u4e0bjavascript\u4e2d\u7c7b\u7684\u521b\u5efa\u4e0e\u7ee7\u627f<\/p>\n

  • \u7c7b\u4f7f\u7528class\u5173\u952e\u5b57\u521b\u5efa，\u4f7f\u7528constructor\u5b8c\u6210\u53c2\u6570\u521d\u59cb\u5316，\u7c7b\u4f3c\u4e8epython\u4e2d\u7684__init__\u6784\u9020\u51fd\u6570<\/li>\n
  • extends\u5b8c\u6210\u7ee7\u627f<\/li>\n

    class<\/span> Person<\/span>{<\/span>
    \n constructor<\/span>(<\/span>name<\/span>)<\/span> {<\/span>
    \n this<\/span>.<\/span>name =<\/span> name;<\/span>
    \n }<\/span>
    \n sayHello<\/span>(<\/span>)<\/span>{<\/span>
    \n console.<\/span>log<\/span>(<\/span>`<\/span>${<\/span>this<\/span>.<\/span>name}<\/span><\/span> say hello<\/span>`<\/span><\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    class<\/span> Student<\/span> extends<\/span> Person<\/span>{<\/span>
    \n constructor<\/span>(<\/span>name,<\/span>age<\/span>)<\/span> {<\/span>
    \n super<\/span>(<\/span>name)<\/span>;<\/span>
    \n this<\/span>.<\/span>age =<\/span> age;<\/span>
    \n }<\/span>
    \n introduce<\/span>(<\/span>)<\/span>{<\/span>
    \n console.<\/span>log<\/span>(<\/span>`<\/span>${<\/span>this<\/span>.<\/span>name}<\/span><\/span> is <\/span>${<\/span>this<\/span>.<\/span>age}<\/span><\/span> years old<\/span>`<\/span><\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    var<\/span> student_1 =<\/span> new<\/span> Student<\/span>(<\/span>'Tommy'<\/span>,<\/span>18<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>student_1)<\/span>;<\/span>
    \nstudent_1.<\/span>sayHello<\/span>(<\/span>)<\/span>;<\/span>
    \nstudent_1.<\/span>introduce<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    \u4e0a\u9762\u7684\u5b50\u7c7b\u5b9e\u4f8b\u91cc\u9762\u6ca1\u6709introduce\u65b9\u6cd5，\u4f46\u662f\u6210\u529f\u8c03\u7528\u4e86？\u7136\u540e\u6211\u4eec\u5f15\u5165\u4e86\/\u539f\u578b\/\u7684\u6982\u5ff5
    \n\u539f\u578b：\u672c\u8eab\u662f\u4e00\u4e2a\u666e\u901a\u7684\u5bf9\u8c61，\u7528\u6765\u7ed9\u522b\u7684\u5bf9\u8c61\u5171\u4eab\u5c5e\u6027\u548c\u65b9\u6cd5\u7684，javascript\u91cc\u9762\u7c7b\u521b\u5efa\u7684\u65b9\u6cd5\u9ed8\u8ba4\u88ab\u4f20\u5165\u5230\u4e86\u539f\u578b\u91cc\u9762，\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5728\u5b50\u7c7b\u5b9e\u4f8b\u5bf9\u8c61\u91cc\u9762\u76f4\u63a5\u8c03\u7528\u5230introduce\u65b9\u6cd5\u3002<\/p>\n

    console.<\/span>log<\/span>(<\/span>student_1.<\/span>hasOwnProperty<\/span>(<\/span>'introduce'<\/span>)<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>student_1.<\/span>__proto__.<\/span>hasOwnProperty<\/span>(<\/span>'introduce'<\/span>)<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>student_1.<\/span>__proto__.<\/span>__proto__.<\/span>hasOwnProperty<\/span>(<\/span>'introduce'<\/span>)<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>Student<\/span>.<\/span>prototype.<\/span>hasOwnProperty<\/span>(<\/span>'introduce'<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    \u8fd9\u662f\u57fa\u4e8e\u4e0a\u9762\u4ee3\u7801\u7684\u62d3\u5c55，\u91cc\u9762_proto__\u6307\u7684\u662f\u9690\u5f0f\u539f\u578b，prototype\u6307\u7684\u5c31\u662f\u539f\u578b，student_1._proto===Student.prototype\u5373\u7c7b\u548c\u5176\u521b\u5efa\u7684\u7c7b\u5b9e\u4f8b\u5bf9\u8c61\u662f\u5168\u7b49\u7684，\u5199\u4e24\u4e2a__proto__\u5c31\u662f\u6307\u8be5\u7c7b\u7684\u7236\u7c7b\u7684\u9690\u5f0f\u539f\u578b
    \nhasOwnproperty:\u68c0\u6d4b\u4e00\u4e2a\u5c5e\u6027\u662f\u5426\u4e3a\u81ea\u8eab\u6240\u62e5\u6709，\u6709\u5c31\u8fd4\u56detrue,\u6ca1\u6709\u5c31\u8fd4\u56defalse<\/p>\n

    \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u6839\u636e\u4e0a\u9762\u7684\u8f93\u51fa\u53ef\u4ee5\u8bf4\u660e，\u521b\u5efa\u7684introduce\u65b9\u6cd5，\u88ab\u81ea\u52a8\u4e0a\u4f20\u5728\u4e86Student\u7684\u539f\u578b\u91cc\u9762,\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5728\u5b9e\u4f8b\u5bf9\u8c61student_1\u91cc\u9762\u76f4\u63a5\u8c03\u7528<\/p>\n

    \u793a\u4f8b1<\/h6>\n
    \n

    \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u8fd9\u91cc\u8bf4\u660enavigator\u7684userAgent\u5c5e\u6027\u4e0d\u5728navigator\u5bf9\u8c61\u4e0b\u9762，\u800c\u662f\u5728\u539f\u578b\u4e0a\u9762<\/p>\n

    \/\/\u5199\u4e00\u4e2a\u811a\u672c<\/span>
    \nfunction<\/span> Navigator<\/span>(<\/span>)<\/span>{<\/span>}<\/span>
    \nNavigator<\/span>.<\/span>prototype.<\/span>userAgent =<\/span> 'xxx'<\/span>
    \nnavigator =<\/span> new<\/span> Navigator<\/span>(<\/span>)<\/span><\/p>\n

    \u6211\u4eec\u5e94\u8be5\u8fd9\u6837\u8865\u73af\u5883<\/p>\n

    \u793a\u4f8b2<\/h6>\n
    \n

    \"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \u8fd9\u91cc\u8bf4\u660e\u8be5\u5c5e\u6027\u5199\u5728\u4e86document\u7684\u7236\u7c7b\u7684\u539f\u578b\u91cc\u9762，dir(document)\u67e5\u770b\u5f97\u5230document\u5728HTMLDocument\u91cc\u9762HTMLDocument\u5728Document\u91cc\u9762<\/p>\n

    function<\/span> Document<\/span>(<\/span>)<\/span>{<\/span>}<\/span>
    \nDocument<\/span>.<\/span>prototype.<\/span>createElement<\/span> =<\/span> function<\/span>(<\/span>tag_name<\/span>)<\/span>{<\/span>
    \n console.<\/span>log<\/span>(<\/span>tag_name)<\/span>;<\/span>
    \n}<\/span>
    \nfunction<\/span> HTMLDocument<\/span>(<\/span>)<\/span>{<\/span>}<\/span>
    \n\/\/ \u7c7b\u4e4b\u95f4\u7684\u539f\u578b\u5173\u7cfb\u7ed1\u5b9a，\u7b2c\u4e00\u4e2a\u662f\u5b50\u7c7b，\u7b2c\u4e8c\u4e2a\u662f\u7236\u7c7b<\/span>
    \nObject.<\/span>setPrototypeOf<\/span>(<\/span>HTMLDocument<\/span>.<\/span>prototype,<\/span>Document<\/span>.<\/span>prototype)<\/span>;<\/span>
    \ndocument =<\/span> new<\/span> HTMLDocument<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    console.<\/span>log<\/span>(<\/span>document.<\/span>hasOwnProperty<\/span>(<\/span>'createElement'<\/span>)<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>document.<\/span>__proto__.<\/span>hasOwnProperty<\/span>(<\/span>'createElement'<\/span>)<\/span>)<\/span>;<\/span>
    \nconsole.<\/span>log<\/span>(<\/span>document.<\/span>__proto__.<\/span>__proto__.<\/span>hasOwnProperty<\/span>(<\/span>'createElement'<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    \u539f\u578b\u4e4b\u95f4\u7684\u5173\u7cfb\u5c31\u8981\u8fd9\u6837\u5199<\/p>\n

    \u8865\u5145<\/h6>\n
    \n

    document\u91cc\u9762createElement\u5c5e\u6027\u7ecf\u5e38\u68c0\u6d4btoString，\u8fd9\u4e2a\u5c5e\u6027\u5fc5\u987b\u548c\u6d4f\u89c8\u5668\u4fdd\u6301\u4e00\u81f4<\/p>\n

    Document<\/span>.<\/span>prototype.<\/span>createElement.<\/span>toString<\/span> =<\/span> function<\/span>(<\/span>)<\/span>{<\/span>
    \n return<\/span> 'function createElement() { [native code] }'<\/span>;<\/span>
    \n}<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

    \u722c\u866b\u9006\u884c(3)-\u539f\u578b\u4e0e\u539f\u578b\u94fe\u524d\u8a00\u5728\u6d4f\u89c8\u5668\u91cc\u9762，\u53ef\u4ee5\u628a\u539f\u578b\u770b\u6210\u6d4f\u89c8\u5668\u5185\u7f6e\u5bf9\u8c61\u7684\u521b\u5efa\u7c7b，\u539f\u578b\u94fe\u6307\u7684\u662f\u521b\u5efa\u7684\u7c7b\u548c\u5b83\u7684\u7236\u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb
    \n\u6d4f\u89c8\u5668\u5185\u7f6e\u5bf9\u8c61\u62e5\u6709\u56fa\u5b9a\u539f\u751f\u539f\u578b\u94fe\u7ed3\u6784，\u53cd\u722c\u4f1a\u68c0\u6d4b\u5bf9\u8c61\u4e4b\u95f4\u7684\u539f\u578b\u5f15\u7528\u94fe\u6761，\u539f\u578b\u4e0a\u7684\u5c5e\u6027，\u5bf9\u6bd4\u6807\u51c6\u6d4f\u89c8\u5668\u7279\u5f81；\u722c\u866b\u5de5\u5177\u5f80\u5f80\u4f1a\u7be1\u6539\u539f\u578b\u94fe，\u91cd\u5199\u539f\u751f\u539f\u578b\u65b9\u6cd5，\u4e00\u65e6\u6821\u9a8c\u4e0d\u5339\u914d，\u5c31\u4f1a\u88ab\u8bc6\u522b\u4e3a\u722c\u866b
    \n\u5b66\u4e60\u539f\u578b\u4e0e\u539f\u578b\u94fe\u4e4b\u524d\u6211\u4eec\u5148\u4e86\u89e3\u4e00\u4e0bjavas<\/p>\n","protected":false},"author":2,"featured_media":116823,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[187,6203,677],"topic":[],"class_list":["post-116826","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-javascript","tag-6203","tag-677"],"yoast_head":"\n\u722c\u866b\u9006\u884c(3)-\u539f\u578b\u4e0e\u539f\u578b\u94fe - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/116826.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u722c\u866b\u9006\u884c(3)-\u539f\u578b\u4e0e\u539f\u578b\u94fe - 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