JavaScript this关键字

fullName : function() {
    return this.firstName + " " + this.lastName ;
}

function myFunction() {
    return this;
}

<button onclick = "this.style.display = 'none' ">
    点击删除;
</button>

var person = {
    firstName : "Mirror",
    lastName  : "China",
    id 		  : 10086,
    fullName  : function() {
        return this.firstName + " " + this.lastName ;
    }
};

var person1 = {
    fullName : function() {
        return this.firstName + " " + this.lastName ;
    }
};
var person2 = {
    firstName : "Mirror" ,
    lastName  : "China" ,
};
person1.fullName.call(person2) ; // person2将会作为参数供person1调用