3.组合使用构造模式和原型模式

//构造函数        function Person(name,age,job){            this.name=name;            this.age=age;            this.job=job;            this.friends=['summer','xll']        }        Person.prototype={            constructor:Person,            sayName:function(){                alert(this.name)            }        }        var person1=new Person('Nico',23,'Doctor')        var person2=new Person('Greg',13,'Teacher')        //sayName()代表里面的返回值,sayName代表函数        person1.friends.push('Van')        alert(person1.friends)  //summer,xll,Nico        alert(person2.friends)  //summer,xll        alert(person1.friends===person2.friends)  //false        alert(person1.sayName===person2.sayName)  //true        console.log(person1.sayName)   // function(){alert(this.name)}        console.log(person1.sayName()) //Nico