實例1：

function Obj(o){
        function f(){};
        f.prototype = o;
        return new f();
    }
    
    function person(name,age){
        this.name = name;
        this.age = age;
    }

    person.prototype.say = function(){
        console.log(this.name+‘ : ‘+this.age);
    }
    var p1 = Obj(new
 
 person(‘zhangsan‘,23));
    var p2 = Obj(new person(‘zhangsan‘,23));
    console.log(p1);
    console.log(p2);
    console.log(p1.__proto__ === p2.__proto__);//false
    console.log(p1.__proto__.__proto__ ===  p2.__proto__.__proto__);//true
    p1.name1 = ‘zhangsan‘;
    p2.name1 = ‘lisi‘;
    p1.__proto__.name 
 
= ‘liuliu‘;
    console.log(p1);
    console.log(p2);

借助原型可以基於已有的對象創建新的對象；

但是P1和P2是兩個獨立的對象，原型是一樣的；

原型式繼承