全局变量遇到的坑

这种情况结果一样
var aname="The Window";   

console.log(aname);//The Window
console.log(window.aname)//The Window

但是写在$(function(){........})中结果不等
$(function(){
var aname="The Window";   

console.log(aname);//The Window
console.log(window.aname)//underfind

});

案例二

var aname="The Window";
var obj = {
    aname:"My Object",
    getNameFunc : function(){
        return function(){
            alert(this.aname);
        };
    }
};

obj.getNameFunc()();//The Window

obj.getNameFunc()();//The Window

和

$(function(){

var aname="The Window";
var obj = {
    aname:"My Object",
    getNameFunc : function(){
        return function(){
            alert(this.aname);
        };
    }
};

obj.getNameFunc()//这里面的this位window

obj.getNameFunc()();//underfind  })

结果是因为作用于所引起的

详见：http://q.cnblogs.com/q/82633/