call和apply的区别及用法

var func=function(a,b,c){
      console.log([a,b,c]);
}
func.apply(null,[1,2,3]);//输出[1,2,3]
func.call(null,1,2,3);//输出[1,2,3]

var name="window"
var obj1={
    name:"obj1"
};
var ob2={
    name:"obj2"
};
var getName=function(){
    console.log(this.name);
}
getName();//window
getName.call(obj1);//obj1   this指向obj1
getName.call(obj2);//obj2   this指向obj2

var A={
    name:"小王",
    getName:function(){
        console.log(this.name);
    }
};
var B={
    name:"丽丽"
};

A.getName.call(B);