//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');