{"id":4822,"date":"2016-02-29T01:04:30","date_gmt":"2016-02-28T17:04:30","guid":{"rendered":"https:\/\/sdeno.com\/?p=4822"},"modified":"2016-05-12T11:59:04","modified_gmt":"2016-05-12T03:59:04","slug":"js%e4%b8%adthis%e6%8c%87%e5%90%91%e6%b7%b1%e5%85%a5%e7%a0%94%e7%a9%b6","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=4822","title":{"rendered":"js\u4e2dthis\u6307\u5411\u6df1\u5165\u7814\u7a76"},"content":{"rendered":"

js\u4e2dthis\u6307\u5411\u6df1\u5165\u7814\u7a76<\/p>\n

\u4ee5\u4e0b\u8ba8\u8bba\u5747\u5728\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\u3002
\n\u5728\u5168\u5c40\u73af\u5883\u4e2dthis\u6307\u5411\u7684\u662fwindow\u5bf9\u8c61\uff0c\u4f46this\u5728\u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\u662f\u6307\u5411\u4e0d\u540c\u7684\u5bf9\u8c61\u7684\uff0c\u5bf9\u4e8ethis\u6211\u4eec\u53ea
\n\u77e5\u9053\u5b83\u4e00\u5b9a\u662f\u4e00\u4e2aobject\u7c7b\u578b\u3002\u4e0b\u9762\u8ba8\u8bba\u4e0bthis\u5728\u4e0d\u540c\u60c5\u51b5\u7684\u6307\u5411\u95ee\u9898\u3002
\n\u4f8b\u5b501\uff1a
\nfunction a(){
\nvar user = “\u8ffd\u68a6\u5b50”;
\nconsole.log(this.user); \/\/undefined
\nconsole.log(this); \/\/Window
\n}
\na();<\/p>\n

\u4e0a\u9762\u4f8b\u5b50this\u6307\u5411window\u5bf9\u8c61\u90a3\u662f\u56e0\u4e3a\u8fd9\u4e2aa()\u662fwindow\u5bf9\u8c61\u8c03\u7528\u51fa\u6765\u7684
\nwindow.a();\u8fd9\u91cc\u7684this\u662fwindow\u5bf9\u8c61\u3002<\/p>\n

 <\/p>\n

 <\/p>\n

\u4f8b\u5b502\uff1a
\nvar o = {
\nuser:”\u8ffd\u68a6\u5b50”,
\nfn:function(){
\nconsole.log(this.user); \/\/\u8ffd\u68a6\u5b50
\n}
\n}
\nwindow.o.fn();<\/p>\n

\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u7684this\u6307\u5411\u7684\u662fo\u5bf9\u8c61\uff0c\u4f1a\u6709\u4eba\u95ee\u4e86o.fn()\u4e0d\u4e5f\u662f\u5728window\u4e2d\u8c03\u7528\u51fa\u6765\u7684\u5417\uff1f\u4e3a\u4ec0\u4e48this
\n\u4e0d\u662f\u6307\u5411window\u800c\u662fo\u5bf9\u8c61\u5462\uff1f\u4f60\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3\uff0cthis\u5bf9\u8c61\u6307\u5411\u7684\u662f\u5b83\u6700\u8fd1\u7684\u4e0a\u4e00\u4e2a\u5bf9\u8c61\u3002this\u7684\u5916\u5c42
\n\u88abo\u5bf9\u8c61\u5305\u88f9\u7740\uff0co\u5bf9\u8c61\u867d\u7136\u4e5f\u88abwindow\u5305\u88f9\u7740\uff0c\u4f46\u662f\u4f60\u8981\u8c03\u7528fn()\u65b9\u6cd5\u8fd8\u662f\u9760\u8c03\u7528o\u5bf9\u8c61\u624d\u80fd\u8c03\u7528\u5230fn()\u5427\uff01
\n\u6240\u4ee5this\u662f\u6307\u5411\u5b83\u6700\u8fd1\u7684\u4e0a\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n

\u4e3a\u4e86\u66f4\u8bc1\u660e\u4e0a\u9762\u7406\u8bba\u5728\u6765\u4e00\u4e2a\u4f8b\u5b50\u5c31\u77e5\u9053\u4e86\u3002<\/p>\n

 <\/p>\n

\u4f8b\u5b503\uff1a<\/p>\n

var o = {\r\n  a:10,\r\n  b:{\r\n    a:12,\r\n    fn:function(){\r\n       console.log(this.a); \/\/12\r\n    }\r\n  }\r\n}\r\n window.o.b.fn();\r\n\r\n var o = {\r\n    a:10,\r\n    b:{\r\n      \/\/a:12,\r\n      fn:function(){\r\n         console.log(this.a); \/\/undefined\r\n      }\r\n    }\r\n }\r\n window.o.b.fn();\r\n \u597d\u4e00\u8d77\u6765\u5206\u6790\u3002\u4e0a\u9762\u4f8b\u5b50\u552f\u4e00\u533a\u522b\u5c31\u662fa:12\u88ab\u6ce8\u91ca\u6389\uff0c\u6ca1\u6ce8\u91ca\u65f6\u5019this\u6307\u5411\u7684\u662f\u6700\u8fd1\u7684\u4e0a\u4e00\u7ea7\u7684\u5bf9\u8c61b\u5bf9\u8c61\uff0c\r\n \u5f53\u8981\u8c03\u7528this.a\u7684\u65f6\u5019\u5c31\u53bb\u5bfb\u627eb\u5bf9\u8c61\u91cc\u9762\u662f\u5426\u6709\u8fd9\u4e2aa\u5c5e\u6027\u3002\r\n \u5f53a:12\u88ab\u6ce8\u91ca\u7684\u65f6\u5019\uff0c\u5728\u53bb\u5bfb\u627ethis.a\u6ca1\u627e\u5230\uff0c\u867d\u7136b\u5bf9\u8c61\u7684\u4e0a\u4e00\u7ea7\u5bf9\u8c61\u662fo\u5bf9\u8c61\uff0co\u5bf9\u8c61\u6709a\u5c5e\u6027\u4f46\u662fthis\u6ca1\r\n \u53bb\u6307\u5411\u5b83\u7684\u4e0a\u4e00\u7ea7\u7684\u4e0a\u4e00\u7ea7\uff0c\u800c\u53ea\u662f\u6307\u5411\u4e86\u5b83\u7684\u6700\u8fd1\u7684\u4e0a\u4e00\u7ea7\u3002\u8fd9\u4f8b\u5b50\u66f4\u597d\u7684\u8bc1\u660e\u4e86\u4f8b\u5b502\u7684\u7406\u8bba\u4e86\u3002<\/pre>\n
 <\/p>\n
\u5728\u4e3e\u4e00\u4e2a\u5bb9\u6613\u8bef\u5bfc\u4eba\u7684\u4f8b\u5b50
\n\u4f8b\u5b504\uff1a<\/p>\n
var o = {
\na:10,
\nb:{
\na:12,
\nfn:function(){
\nconsole.log(this.a);
\n}
\n}
\n}
\nwindow.o.b.fn(); \/\/ this\u6307\u5411b\u5bf9\u8c61<\/p>\n
var j=window.o.b.fn;
\nwindow.j(); \/\/this\u6307\u5411window\u5bf9\u8c61<\/p>\n
\u770b\u5230\u8fd9\u91cc\u662f\u4e0d\u662f\u6655\u4e86\uff1f\u4f1a\u6709\u4eba\u95ee\u90a3\u4e3a\u4ec0\u4e48\u8d4b\u503c\u7ed9j\u53d8\u91cf\u7684\u65f6\u5019\u5728\u8c03\u7528j()\u7684\u65f6\u5019this\u6307\u5411\u7684\u662fwindow\u5462\uff1f
\n\u5176\u5b9e\u522b\u88ab\u8bef\u5bfc\u4e86\uff0c\u6211\u4eec\u4e4b\u524d\u603b\u7ed3\u7684\u7ed3\u8bba\u8fd8\u662f\u6b63\u786e\u7684\u3002window.o.b.fn\u4ec5\u4ec5\u662f\u5f88\u5355\u7eaf\u7684\u628a\u65b9\u6cd5\u8d4b\u503c\u7ed9j\u53d8\u91cf\u800c\u5df2\uff0c\u800cj()\u76f4\u63a5\u5728\u5168\u5c40\u4e2d\u8c03\u7528\u5c31\u76f8\u5f53\u4e8e\u5728window\u5bf9\u8c61\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e2aj()\u65b9\u6cd5\uff0cwindow\u53bb\u8c03\u7528j()\uff0c\u8ddfb\u5bf9\u8c61\u4e00\u70b9\u5173\u7cfb\u90fd\u6ca1\u6709\u3002<\/p>\n
\u603b\u7ed3\uff1a\u8981\u627e\u5230this\u6307\u5411\u7684\u5bf9\u8c61\u8981\u6ee1\u8db32\u4e2a\u6761\u4ef6<\/span><\/p>\n
1\uff0cthis\u5728\u67d0\u4e2a\u51fd\u6570\u4e2d\u7684\u65f6\u5019\uff0c\u6307\u5411\u7684\u662f\u6700\u8fd1\u7684\u4e0a\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n
\u4f8b\u5982\uff1a object.object2.fn() ,this\u5728fn()\u4e2d\u6307\u5411\u6700\u8fd1\u4e0a\u4e00\u4e2a\u5bf9\u8c61\u5c31\u662fobject2\u3002<\/p>\n
 <\/p>\n
2\uff0cthis\u5728\u67d0\u4e2a\u51fd\u6570\u4e2d\u7684\u65f6\u5019\uff0cthis\u6240\u5728\u7684\u51fd\u6570\u662f\u6700\u8fd1\u4e0a\u4e00\u4e2a\u5bf9\u8c61\u7684\u76f4\u63a5\u65b9\u6cd5\u3002<\/p>\n
\u4f8b\u5982\uff1a object.fn()\uff0c\u6211\u79f0\u8fd9\u4e2afn()\u662fobject\u7684\u76f4\u63a5\u65b9\u6cd5\u3002<\/p>\n
—————————————————————————————————————-<\/p>\n
 <\/p>\n
 <\/p>\n
\u9996\u5148\u5fc5\u987b\u8981\u8bf4\u7684\u662f\uff0cthis\u7684\u6307\u5411\u5728\u51fd\u6570\u5b9a\u4e49\u7684\u65f6\u5019\u662f\u786e\u5b9a\u4e0d\u4e86\u7684\uff0c\u53ea\u6709\u51fd\u6570\u6267\u884c\u7684\u65f6\u5019\u624d\u80fd\u786e\u5b9athis\u5230\u5e95\u6307\u5411\u8c01\uff0c\u5b9e\u9645\u4e0athis\u7684\u6700\u7ec8\u6307\u5411\u7684\u662f\u90a3\u4e2a\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\uff08\u8fd9\u53e5\u8bdd\u6709\u4e9b\u95ee\u9898\uff0c\u540e\u9762\u4f1a\u89e3\u91ca\u4e3a\u4ec0\u4e48\u4f1a\u6709\u95ee\u9898\uff0c\u867d\u7136\u7f51\u4e0a\u5927\u90e8\u5206\u7684\u6587\u7ae0\u90fd\u662f\u8fd9\u6837\u8bf4\u7684\uff0c\u867d\u7136\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\u90a3\u6837\u53bb\u7406\u89e3\u4e0d\u4f1a\u51fa\u4ec0\u4e48\u95ee\u9898\uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\u90a3\u6837\u7406\u89e3\u662f\u4e0d\u51c6\u786e\u7684\uff0c\u6240\u4ee5\u5728\u4f60\u7406\u89e3this\u7684\u65f6\u5019\u4f1a\u6709\u79cd\u7422\u78e8\u4e0d\u900f\u7684\u611f\u89c9\uff09\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u6211\u4f1a\u6df1\u5165\u7684\u63a2\u8ba8\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
\u4e3a\u4ec0\u4e48\u8981\u5b66\u4e60this\uff1f\u5982\u679c\u4f60\u5b66\u8fc7\u51fd\u6570\u5f0f\u7f16\u7a0b\uff0c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff0c\u90a3\u4f60\u80af\u5b9a\u77e5\u9053\u5e72\u4ec0\u4e48\u7528\u7684\uff0c\u5982\u679c\u4f60\u6ca1\u6709\u5b66\u8fc7\uff0c\u90a3\u4e48\u6682\u65f6\u53ef\u4ee5\u4e0d\u7528\u770b\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5f53\u7136\u5982\u679c\u4f60\u6709\u5174\u8da3\u4e5f\u53ef\u4ee5\u770b\u770b\uff0c\u6bd5\u7adf\u8fd9\u662fjs\u4e2d\u5fc5\u987b\u8981\u638c\u63e1\u7684\u4e1c\u897f\u3002<\/p>\n
\u4f8b\u5b501\uff1a<\/p>\n
function<\/span>\u00a0<\/span>a<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>var<\/span>\u00a0<\/span>user<\/span>\u00a0=\u00a0<\/span>“\u8ffd\u68a6\u5b50”<\/span>;<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/undefined<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>);<\/span>\u00a0<\/span>\/\/Window<\/span><\/p>\n
}<\/span><\/p>\n
a<\/span>();<\/span><\/p><\/blockquote>\n
\u6309\u7167\u6211\u4eec\u4e0a\u9762\u8bf4\u7684this\u6700\u7ec8\u6307\u5411\u7684\u662f\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\uff0c\u8fd9\u91cc\u7684\u51fd\u6570a\u5b9e\u9645\u662f\u88abWindow\u5bf9\u8c61\u6240\u70b9\u51fa\u6765\u7684\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u5c31\u53ef\u4ee5\u8bc1\u660e\u3002<\/p>\n
function<\/span>\u00a0<\/span>a<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>var<\/span>\u00a0<\/span>user<\/span>\u00a0=\u00a0<\/span>“\u8ffd\u68a6\u5b50”<\/span>;<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/undefined<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>);<\/span>\u3000\u3000\/\/Window<\/span><\/p>\n
}<\/span><\/p>\n
window<\/span>.<\/span>a<\/span>();<\/span><\/p><\/blockquote>\n
\u548c\u4e0a\u9762\u4ee3\u7801\u4e00\u6837\u5427\uff0c\u5176\u5b9ealert\u4e5f\u662fwindow\u7684\u4e00\u4e2a\u5c5e\u6027\uff0c\u4e5f\u662fwindow\u70b9\u51fa\u6765\u7684\u3002<\/p>\n
\u4f8b\u5b502\uff1a<\/p>\n
var<\/span>\u00a0<\/span>o<\/span>\u00a0=\u00a0<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>user<\/span>:<\/span>“\u8ffd\u68a6\u5b50”<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>fn<\/span>:<\/span>function<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>user<\/span>);<\/span>\u00a0\u00a0<\/span>\/\/\u8ffd\u68a6\u5b50<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
}<\/span><\/p>\n
o<\/span>.<\/span>fn<\/span>();<\/span><\/p><\/blockquote>\n
\u8fd9\u91cc\u7684this\u6307\u5411\u7684\u662f\u5bf9\u8c61o\uff0c\u56e0\u4e3a\u4f60\u8c03\u7528\u8fd9\u4e2afn\u662f\u901a\u8fc7o.fn()\u6267\u884c\u7684\uff0c\u90a3\u81ea\u7136\u6307\u5411\u5c31\u662f\u5bf9\u8c61o\uff0c\u8fd9\u91cc\u518d\u6b21\u5f3a\u8c03\u4e00\u70b9\uff0cthis\u7684\u6307\u5411\u5728\u51fd\u6570\u521b\u5efa\u7684\u65f6\u5019\u662f\u51b3\u5b9a\u4e0d\u4e86\u7684\uff0c\u5728\u8c03\u7528\u7684\u65f6\u5019\u624d\u80fd\u51b3\u5b9a\uff0c\u8c01\u8c03\u7528\u7684\u5c31\u6307\u5411\u8c01\uff0c\u4e00\u5b9a\u8981\u641e\u6e05\u695a\u8fd9\u4e2a\u3002<\/p>\n
\u5176\u5b9e\u4f8b\u5b501\u548c\u4f8b\u5b502\u8bf4\u7684\u5e76\u4e0d\u591f\u51c6\u786e\uff0c\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\u5c31\u53ef\u4ee5\u63a8\u7ffb\u4e0a\u9762\u7684\u7406\u8bba\u3002<\/p>\n
\u5982\u679c\u8981\u5f7b\u5e95\u7684\u641e\u61c2this\u5fc5\u987b\u770b\u63a5\u4e0b\u6765\u7684\u51e0\u4e2a\u4f8b\u5b50<\/p>\n
\u4f8b\u5b503\uff1a<\/p>\n
var<\/span>\u00a0<\/span>o<\/span>\u00a0=\u00a0<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>user<\/span>:<\/span>“\u8ffd\u68a6\u5b50”<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>fn<\/span>:<\/span>function<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/\u8ffd\u68a6\u5b50<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
}<\/span><\/p>\n
window<\/span>.<\/span>o<\/span>.<\/span>fn<\/span>();<\/span><\/p><\/blockquote>\n
\u8fd9\u6bb5\u4ee3\u7801\u548c\u4e0a\u9762\u7684\u90a3\u6bb5\u4ee3\u7801\u51e0\u4e4e\u662f\u4e00\u6837\u7684\uff0c\u4f46\u662f\u8fd9\u91cc\u7684this\u4e3a\u4ec0\u4e48\u4e0d\u662f\u6307\u5411window\uff0c\u5982\u679c\u6309\u7167\u4e0a\u9762\u7684\u7406\u8bba\uff0c\u6700\u7ec8this\u6307\u5411\u7684\u662f\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\uff0c\u8fd9\u91cc\u5148\u8bf4\u4e2a\u800c\u5916\u8bdd\uff0cwindow\u662fjs\u4e2d\u7684\u5168\u5c40\u5bf9\u8c61\uff0c\u6211\u4eec\u521b\u5efa\u7684\u53d8\u91cf\u5b9e\u9645\u4e0a\u662f\u7ed9window\u6dfb\u52a0\u5c5e\u6027\uff0c\u6240\u4ee5\u8fd9\u91cc\u53ef\u4ee5\u7528window\u70b9o\u5bf9\u8c61\u3002<\/p>\n
\u8fd9\u91cc\u5148\u4e0d\u89e3\u91ca\u4e3a\u4ec0\u4e48\u4e0a\u9762\u7684\u90a3\u6bb5\u4ee3\u7801this\u4e3a\u4ec0\u4e48\u6ca1\u6709\u6307\u5411window\uff0c\u6211\u4eec\u518d\u6765\u770b\u4e00\u6bb5\u4ee3\u7801\u3002<\/p>\n
var<\/span>\u00a0<\/span>o<\/span>\u00a0=\u00a0<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>a<\/span>:<\/span>10<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>b<\/span>:<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>a<\/span>:<\/span>12<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>fn<\/span>:<\/span>function<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>a<\/span>);<\/span>\u00a0<\/span>\/\/12<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
}<\/span><\/p>\n
o<\/span>.<\/span>b<\/span>.<\/span>fn<\/span>();<\/span><\/p><\/blockquote>\n
\u8fd9\u91cc\u540c\u6837\u4e5f\u662f\u5bf9\u8c61o\u70b9\u51fa\u6765\u7684\uff0c\u4f46\u662f\u540c\u6837this\u5e76\u6ca1\u6709\u6267\u884c\u5b83\uff0c\u90a3\u4f60\u80af\u5b9a\u4f1a\u8bf4\u6211\u4e00\u5f00\u59cb\u8bf4\u7684\u90a3\u4e9b\u4e0d\u5c31\u90fd\u662f\u9519\u8bef\u7684\u5417\uff1f\u5176\u5b9e\u4e5f\u4e0d\u662f\uff0c\u53ea\u662f\u4e00\u5f00\u59cb\u8bf4\u7684\u4e0d\u51c6\u786e\uff0c\u63a5\u4e0b\u6765\u6211\u5c06\u8865\u5145\u4e00\u53e5\u8bdd\uff0c\u6211\u76f8\u4fe1\u4f60\u5c31\u53ef\u4ee5\u5f7b\u5e95\u7684\u7406\u89e3this\u7684\u6307\u5411\u7684\u95ee\u9898\u3002<\/p>\n
\u60c5\u51b51\uff1a\u5982\u679c\u4e00\u4e2a\u51fd\u6570\u4e2d\u6709this\uff0c\u4f46\u662f\u5b83\u6ca1\u6709\u88ab\u4e0a\u4e00\u7ea7\u7684\u5bf9\u8c61\u6240\u8c03\u7528\uff0c\u90a3\u4e48this\u6307\u5411\u7684\u5c31\u662fwindow\uff0c\u8fd9\u91cc\u9700\u8981\u8bf4\u660e\u7684\u662f\u5728js\u7684\u4e25\u683c\u7248\u4e2dthis\u6307\u5411\u7684\u4e0d\u662fwindow\uff0c\u4f46\u662f\u6211\u4eec\u8fd9\u91cc\u4e0d\u63a2\u8ba8\u4e25\u683c\u7248\u7684\u95ee\u9898\uff0c\u4f60\u60f3\u4e86\u89e3\u53ef\u4ee5\u81ea\u884c\u4e0a\u7f51\u67e5\u627e\u3002<\/p>\n
\u60c5\u51b52\uff1a\u5982\u679c\u4e00\u4e2a\u51fd\u6570\u4e2d\u6709this\uff0c\u8fd9\u4e2a\u51fd\u6570\u6709\u88ab\u4e0a\u4e00\u7ea7\u7684\u5bf9\u8c61\u6240\u8c03\u7528\uff0c\u90a3\u4e48this\u6307\u5411\u7684\u5c31\u662f\u4e0a\u4e00\u7ea7\u7684\u5bf9\u8c61\u3002<\/p>\n
\u60c5\u51b53\uff1a\u5982\u679c\u4e00\u4e2a\u51fd\u6570\u4e2d\u6709this\uff0c\u8fd9\u4e2a\u51fd\u6570\u4e2d\u5305\u542b\u591a\u4e2a\u5bf9\u8c61\uff0c\u5c3d\u7ba1\u8fd9\u4e2a\u51fd\u6570\u662f\u88ab\u6700\u5916\u5c42\u7684\u5bf9\u8c61\u6240\u8c03\u7528\uff0cthis\u6307\u5411\u7684\u4e5f\u53ea\u662f\u5b83\u4e0a\u4e00\u7ea7\u7684\u5bf9\u8c61\uff0c\u4f8b\u5b503\u53ef\u4ee5\u8bc1\u660e\uff0c\u5982\u679c\u4e0d\u76f8\u4fe1\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u6211\u4eec\u7ee7\u7eed\u770b\u51e0\u4e2a\u4f8b\u5b50\u3002<\/p>\n
var<\/span>\u00a0<\/span>o<\/span>\u00a0=\u00a0<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>a<\/span>:<\/span>10<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>b<\/span>:<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>\/\/ a:12,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>fn<\/span>:<\/span>function<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>a<\/span>);<\/span>\u00a0<\/span>\/\/undefined<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
}<\/span><\/p>\n
o<\/span>.<\/span>b<\/span>.<\/span>fn<\/span>();<\/span><\/p><\/blockquote>\n
\u5c3d\u7ba1\u5bf9\u8c61b\u4e2d\u6ca1\u6709\u5c5e\u6027a\uff0c\u8fd9\u4e2athis\u6307\u5411\u7684\u4e5f\u662f\u5bf9\u8c61b\uff0c\u56e0\u4e3athis\u53ea\u4f1a\u6307\u5411\u5b83\u7684\u4e0a\u4e00\u7ea7\u5bf9\u8c61\uff0c\u4e0d\u7ba1\u8fd9\u4e2a\u5bf9\u8c61\u4e2d\u6709\u6ca1\u6709this\u8981\u7684\u4e1c\u897f\u3002<\/p>\n
\u8fd8\u6709\u4e00\u79cd\u6bd4\u8f83\u7279\u6b8a\u7684\u60c5\u51b5\uff0c\u4f8b\u5b504\uff1a<\/p>\n
var<\/span>\u00a0<\/span>o<\/span>\u00a0=\u00a0<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>a<\/span>:<\/span>10<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>b<\/span>:<\/span>{<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>a<\/span>:<\/span>12<\/span>,<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>fn<\/span>:<\/span>function<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>.<\/span>a<\/span>);<\/span>\u00a0<\/span>\/\/undefined<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>console<\/span>.<\/span>log<\/span>(<\/span>this<\/span>);<\/span>\u00a0<\/span>\/\/window<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>}<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>j<\/span>\u00a0=\u00a0<\/span>o<\/span>.<\/span>b<\/span>.<\/span>fn<\/span>;<\/span><\/p>\n
j<\/span>();<\/span><\/p><\/blockquote>\n
\u8fd9\u91ccthis\u6307\u5411\u7684\u662fwindow\uff0c\u662f\u4e0d\u662f\u6709\u4e9b\u8499\u4e86\uff1f\u5176\u5b9e\u662f\u56e0\u4e3a\u4f60\u6ca1\u6709\u7406\u89e3\u4e00\u53e5\u8bdd\uff0c\u8fd9\u53e5\u8bdd\u540c\u6837\u81f3\u5173\u91cd\u8981\u3002<\/p>\n
this\u6c38\u8fdc\u6307\u5411\u7684\u662f\u6700\u540e\u8c03\u7528\u5b83\u7684\u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u770b\u5b83\u6267\u884c\u7684\u65f6\u5019\u662f\u8c01\u8c03\u7528\u7684\uff0c\u4f8b\u5b504\u4e2d\u867d\u7136\u51fd\u6570fn\u662f\u88ab\u5bf9\u8c61b\u6240\u5f15\u7528\uff0c\u4f46\u662f\u5728\u5c06fn\u8d4b\u503c\u7ed9\u53d8\u91cfj\u7684\u65f6\u5019\u5e76\u6ca1\u6709\u6267\u884c\u6240\u4ee5\u6700\u7ec8\u6307\u5411\u7684\u662fwindow\uff0c\u8fd9\u548c\u4f8b\u5b503\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u4f8b\u5b503\u662f\u76f4\u63a5\u6267\u884c\u4e86fn\u3002<\/p>\n
this\u8bb2\u6765\u8bb2\u53bb\u5176\u5b9e\u5c31\u662f\u90a3\u4e48\u4e00\u56de\u4e8b\uff0c\u53ea\u4e0d\u8fc7\u5728\u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\u6307\u5411\u7684\u4f1a\u6709\u4e9b\u4e0d\u540c\uff0c\u4e0a\u9762\u7684\u603b\u7ed3\u6bcf\u4e2a\u5730\u65b9\u90fd\u6709\u4e9b\u5c0f\u9519\u8bef\uff0c\u4e5f\u4e0d\u80fd\u8bf4\u662f\u9519\u8bef\uff0c\u800c\u662f\u5728\u4e0d\u540c\u73af\u5883\u4e0b\u60c5\u51b5\u5c31\u4f1a\u6709\u4e0d\u540c\uff0c\u6240\u4ee5\u6211\u4e5f\u6ca1\u6709\u529e\u6cd5\u4e00\u6b21\u89e3\u91ca\u6e05\u695a\uff0c\u53ea\u80fd\u4f60\u6162\u6162\u5730\u7684\u53bb\u4f53\u4f1a\u3002<\/p>\n
\u6784\u9020\u51fd\u6570\u7248this\uff1a<\/p>\n
function<\/span>\u00a0<\/span>Fn<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>“\u8ffd\u68a6\u5b50”<\/span>;<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>Fn<\/span>();<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/\u8ffd\u68a6\u5b50<\/span><\/p><\/blockquote>\n
\u8fd9\u91cc\u4e4b\u6240\u4ee5\u5bf9\u8c61a\u53ef\u4ee5\u70b9\u51fa\u51fd\u6570Fn\u91cc\u9762\u7684user\u662f\u56e0\u4e3anew\u5173\u952e\u5b57\u53ef\u4ee5\u6539\u53d8this\u7684\u6307\u5411\uff0c\u5c06\u8fd9\u4e2athis\u6307\u5411\u5bf9\u8c61a\uff0c\u4e3a\u4ec0\u4e48\u6211\u8bf4a\u662f\u5bf9\u8c61\uff0c\u56e0\u4e3a\u7528\u4e86new\u5173\u952e\u5b57\u5c31\u662f\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u7406\u89e3\u8fd9\u53e5\u8bdd\u53ef\u4ee5\u60f3\u60f3\u6211\u4eec\u7684\u4f8b\u5b503\uff0c\u6211\u4eec\u8fd9\u91cc\u7528\u53d8\u91cfa\u521b\u5efa\u4e86\u4e00\u4e2aFn\u7684\u5b9e\u4f8b\uff08\u76f8\u5f53\u4e8e\u590d\u5236\u4e86\u4e00\u4efdFn\u5230\u5bf9\u8c61a\u91cc\u9762\uff09\uff0c\u6b64\u65f6\u4ec5\u4ec5\u53ea\u662f\u521b\u5efa\uff0c\u5e76\u6ca1\u6709\u6267\u884c\uff0c\u800c\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570Fn\u7684\u662f\u5bf9\u8c61a\uff0c\u90a3\u4e48this\u6307\u5411\u7684\u81ea\u7136\u662f\u5bf9\u8c61a\uff0c\u90a3\u4e48\u4e3a\u4ec0\u4e48\u5bf9\u8c61Fn\u4e2d\u4f1a\u6709user\uff0c\u56e0\u4e3a\u4f60\u5df2\u7ecf\u590d\u5236\u4e86\u4e00\u4efdFn\u51fd\u6570\u5230\u5bf9\u8c61a\u4e2d\uff0c\u7528\u4e86new\u5173\u952e\u5b57\u5c31\u7b49\u540c\u4e8e\u590d\u5236\u4e86\u4e00\u4efd\u3002<\/p>\n
\u9664\u4e86\u4e0a\u9762\u7684\u8fd9\u4e9b\u4ee5\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u81ea\u884c\u6539\u53d8this\u7684\u6307\u5411\uff0c\u5173\u4e8e\u81ea\u884c\u6539\u53d8this\u7684\u6307\u5411\u8bf7\u770bJavaScript\u4e2dcall,apply,bind\u65b9\u6cd5\u7684\u603b\u7ed3\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8be6\u7ec6\u7684\u8bf4\u660e\u4e86\u6211\u4eec\u5982\u4f55\u624b\u52a8\u66f4\u6539this\u7684\u6307\u5411\u3002<\/p>\n
\u66f4\u65b0\u4e00\u4e2a\u5c0f\u95ee\u9898\u5f53this\u78b0\u5230return\u65f6<\/p>\n
function<\/span>\u00a0<\/span>fn<\/span>()<\/span>\u00a0\u00a0<\/span><\/p>\n
{<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>‘\u8ffd\u68a6\u5b50’<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0<\/span>{};<\/span>\u00a0\u00a0<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/undefined<\/span><\/p><\/blockquote>\n
\u518d\u770b\u4e00\u4e2a<\/p>\n
function<\/span>\u00a0<\/span>fn<\/span>()<\/span>\u00a0\u00a0<\/span><\/p>\n
{<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>‘\u8ffd\u68a6\u5b50’<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0<\/span>function<\/span>(){};<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/undefined<\/span><\/p><\/blockquote>\n
\u518d\u6765<\/p>\n
function<\/span>\u00a0<\/span>fn<\/span>()<\/span>\u00a0\u00a0<\/span><\/p>\n
{<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>‘\u8ffd\u68a6\u5b50’<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0<\/span>1<\/span>;<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/\u8ffd\u68a6\u5b50<\/span><\/p><\/blockquote>\n
function<\/span>\u00a0<\/span>fn<\/span>()<\/span>\u00a0\u00a0<\/span><\/p>\n
{<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>‘\u8ffd\u68a6\u5b50’<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0<\/span>undefined<\/span>;<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/\u8ffd\u68a6\u5b50<\/span><\/p><\/blockquote>\n
\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n
\u5982\u679c\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u90a3\u4e48this\u6307\u5411\u7684\u5c31\u662f\u90a3\u4e2a\u8fd4\u56de\u7684\u5bf9\u8c61\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e0d\u662f\u4e00\u4e2a\u5bf9\u8c61\u90a3\u4e48this\u8fd8\u662f\u6307\u5411\u51fd\u6570\u7684\u5b9e\u4f8b\u3002<\/p>\n
function<\/span>\u00a0<\/span>fn<\/span>()<\/span>\u00a0\u00a0<\/span><\/p>\n
{<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>‘\u8ffd\u68a6\u5b50’<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0<\/span>undefined<\/span>;<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>);<\/span>\u00a0<\/span>\/\/fn {user: “\u8ffd\u68a6\u5b50”}<\/span><\/p><\/blockquote>\n
\u8fd8\u6709\u4e00\u70b9\u5c31\u662f\u867d\u7136null\u4e5f\u662f\u5bf9\u8c61\uff0c\u4f46\u662f\u5728\u8fd9\u91ccthis\u8fd8\u662f\u6307\u5411\u90a3\u4e2a\u51fd\u6570\u7684\u5b9e\u4f8b\uff0c\u56e0\u4e3anull\u6bd4\u8f83\u7279\u6b8a\u3002<\/p>\n
function<\/span>\u00a0<\/span>fn<\/span>()<\/span>\u00a0\u00a0<\/span><\/p>\n
{<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>user<\/span>\u00a0=\u00a0<\/span>‘\u8ffd\u68a6\u5b50’<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>return<\/span>\u00a0<\/span>null<\/span>;<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>;<\/span>\u00a0\u00a0<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>user<\/span>);<\/span>\u00a0<\/span>\/\/\u8ffd\u68a6\u5b50<\/span><\/p><\/blockquote>\n
\u77e5\u8bc6\u70b9\u8865\u5145\uff1a<\/p>\n
1.\u5728\u4e25\u683c\u7248\u4e2d\u7684\u9ed8\u8ba4\u7684this\u4e0d\u518d\u662fwindow\uff0c\u800c\u662fundefined\u3002<\/p>\n
2.new\u64cd\u4f5c\u7b26\u4f1a\u6539\u53d8\u51fd\u6570this\u7684\u6307\u5411\u95ee\u9898\uff0c\u867d\u7136\u6211\u4eec\u4e0a\u9762\u8bb2\u89e3\u8fc7\u4e86\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u6df1\u5165\u7684\u8ba8\u8bba\u8fd9\u4e2a\u95ee\u9898\uff0c\u7f51\u4e0a\u4e5f\u5f88\u5c11\u8bf4\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u6709\u5fc5\u8981\u8bf4\u4e00\u4e0b\u3002<\/p>\n
function<\/span>\u00a0<\/span>fn<\/span>(){<\/span><\/p>\n
\u00a0\u00a0\u00a0\u00a0<\/span>this<\/span>.<\/span>num<\/span>\u00a0=\u00a0<\/span>1<\/span>;<\/span><\/p>\n
}<\/span><\/p>\n
var<\/span>\u00a0<\/span>a<\/span>\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>fn<\/span>();<\/span><\/p>\n
console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>.<\/span>num<\/span>);<\/span>\u00a0<\/span>\/\/1<\/span><\/p><\/blockquote>\n
\u4e3a\u4ec0\u4e48this\u4f1a\u6307\u5411a\uff1f\u9996\u5148new\u5173\u952e\u5b57\u4f1a\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u5bf9\u8c61\uff0c\u7136\u540e\u4f1a\u81ea\u52a8\u8c03\u7528\u4e00\u4e2a\u51fd\u6570apply\u65b9\u6cd5\uff0c\u5c06this\u6307\u5411\u8fd9\u4e2a\u7a7a\u5bf9\u8c61\uff0c\u8fd9\u6837\u7684\u8bdd\u51fd\u6570\u5185\u90e8\u7684this\u5c31\u4f1a\u88ab\u8fd9\u4e2a\u7a7a\u7684\u5bf9\u8c61\u66ff\u4ee3\u3002<\/p>\n
\u5fae\u4fe1\u94fe\u63a5<\/a><\/p>\n
\u4f5c\u8005\u94fe\u63a5<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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