js this

指当前调用的对象：4种绑定规则：默认绑定、隐式绑定、显式绑定、new绑定，优先级从低到高

var person = {
    name:'zhangsan',
    age:20,
    getName:function(){
        console.log(this.name);
    },
    getAge:function(){
        function aa() { //局部函数
            console.log(this+'  '+this.age);//局部函数this指向window 
        }
        aa();
        console.log(this+' ' + this.age);
    }
};
person.getName();
person.getAge();