apply和call

apply的参数是array call没有限制

obj.call(thisObj,arg1,arg2,...);
obj.apply(thisObj,[arg1,arg2,...]);

两者作用一致，都是把obj(即this)绑定到thisObj，这时候thisObj具备了obj的属性和方法。或者说thisObj继承了obj的属性和方法

var Parent = function(){
    this.name = "yjc";
    this.age = 22;
}

var child = {};

console.log(child);//Object {} ,空对象

Parent.call(child);

console.log(child); //Object {name: "yjc", age: 22}