闭包练习

 1 var name = "window";
 2         var foo = {
 3             name: "hello",
 4             setName:function(){
 5                 return function(){
 6                     return this.name;
 7                 };
 8             }
 9         };
10         alert(foo.setName()());
11 // window

 1 var name = "window";
 2         var foo = {
 3             name: "hello",
 4             setName:function(){
 5                 var that = this;
 6                 return function(){
 7                     return that.name;
 8                 };
 9             }
10         };
11         alert(foo.setName()());
12 //hello