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                ~~~ function Foo() { getName = function () { //這個米有this,和實例沒有關系 console.log(1); }; return this; } Foo.getName = function BBB() { // 把Foo當成對象,加了getName這樣一個屬性 console.log(2); }; Foo.prototype.getName = function AAA() { //當做類供實例使用,公共方法 console.log(3); }; var getName = function () { //普通的函數 console.log(4); }; function getName() { //普通的函數 console.log(5); } Foo.getName();//=>2 把Foo當做一個對象,找Foo的私有方法執行 getName();//=>4 執行全局下的GET-NAME Foo().getName();//=>1 因為沒有new ,先把FOO當做普通函數執行, 和prototype沒有關系,和屬性沒有關系。 執行返回的結果在調取GET-NAME執行 getName();//=>1 執行的依然是全局下的GET-NAME <================================================================> console.log(new Foo.getName());;//=>A:(Foo.getName) =>new A() =>2 new 當做類來弄,new 整體Foo.getName() new Foo().getName();//=>B:new Foo() =>B.getName() =>3 new整體new Foo() <================================================================> console.log(new new Foo().getName()); //=>C:new Foo() =>new C[Foo的實例].getName() =>D:C.getName =>new D(); =>3 (先計算new Foo()創建一個實例f,然后new f.getName(), 先找到f.getName,在把這個函數new一下, 最后其實相當于把f.getName當做一個類,返回這個類的一個實例) ~~~ ![](https://img.kancloud.cn/ba/b8/bab87aa3cd86e85c6156db4617716214_1974x1040.png) ![](https://img.kancloud.cn/c6/1b/c61b992761fec236bced02e1cb9cb02c_1171x462.png) <================================================================> ![](https://img.kancloud.cn/9d/cd/9dcddf1f548200beb77b9c46c02515b6_886x630.png) ![](https://img.kancloud.cn/5c/36/5c3660d27d2b946022f72e0b7f64eccb_828x635.png) ![](https://img.kancloud.cn/71/91/719198902e019a72f8b4ed4917164dd1_824x417.png)
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