寄生式继承

function creatAnother(original){
        var clone = new Object(original);
        clone.say = function(){
            console.log(this.name);
        }
        return clone;    
    }

    var person1 = {
        name:‘zhangsan‘,
        friends:[‘jim‘,‘tom‘,‘van‘]
    };
    var person2 = {
        name:‘lisi‘,
        friends:[‘klkx‘,‘qu‘,‘you‘]
    };

    var p1 = creatAnother( person1 );
    var p2 = creatAnother( person2 );
    p1.say();
    p2.say();
    console.log(p1.__proto__ === p2.__proto__);//true
    console.log(p1.__proto__);
    console.log(p2.__proto__);