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原型模式具有共享的本性，构造模式没有共享的本性可以传参

方法共享，属性不共享
实现方法

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function person(name,age,job){
    this.name=name;
    this.age=age;
    this.job=job;
    this.friends=["a","b","c"];
}
person.prototype={
    constructor:person,
    sayName:function(){
        console.log(this.name);
    }
};
 var person1=new person("nichals","20","software engineer");
 var person2=new person("ping","21","engineer");
 person1.friends.push("d");/*通过实例1对数组修改*/
 console.log(person1.name);
 person1.sayName();
 console.log(person2.name);
 console.log(person2.friends);/*观察实例2的数组是否变化*/