//定义函数 function people(name,sex,age){  this.name = name;  this.sex = sex;  this.age = age; }   //共享isStudent与sayName方法 people.prototype = {   isStudent:true,  sayName:function(){   alert(this.name);  } }   var people1 = new people('韩梅梅','女',16);  //实例化对象1 var people2 = new people('李磊','男',17);    //实例化对象2   //通过共享的方法让两个对象说出自己的名字 people1.sayName(); people2.sayName();   //通过共享的参数判断他们都是学生 if(people1.isStudent == people2.isStudent)alert('他们都是学生');