执行上下文this

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this指向window的两种情况：1.new function 2.全局对象this

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function func1(){
    this.name = "jim";
    console.log(this); //this 指向 window
}
function func2(){
    console.log(this.name); //this 指向 window
}
func1();
func2();
console.log(this); //this 指向 window

通过构造器创建对象，this指向该创建的对象，如var harry = new Persion(‘Harry’,18,’female’)，this指向harry对象

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function Persion(name,age,sex){
    this.name = name;
    this.age = age;
    this.sex = sex;
    this.changeAge = function(age){
        this.age = age;
        console.log(this); //this 指向 harry对象
    }
    console.log(this); //this 指向 harry对象
}
var harry = new Persion('Harry',18,'female');
harry.changeAge(22);