js閉包例子

很經典的一個js閉包，收藏下

<script>

var user = "The window";

var box = {
	user:"The Box",
	getUser:function(){
		var that = this;
		return function(){
			return that.user;
		};
	}
}

//alert(box.getUser()());
//alert(box.getUser().call(box));
alert(box.getUser.call(window)());
</script>