function p(){
this.name = "111"
}
var o = {};
p.call(o);
o.name;//111 o.p() o.name="111"
function Persion(name,age){
this.name = name;
this.age = age;
}
模仿实现new方法
var p1 = new Person("cd",22)
function New(f){ // f 是个构造器函数
return function(){
var o = {"__proto__":f.prototype};
f.apply(o.arguments);//o.f();
return o;
}
}
var p2 = New(Person)("xx",33);
