//定義函數
function people(name,sex,age){
 this.name = name;
 this.sex = sex;
 this.age = age;
}
 
//共享isStudent與sayName方法
people.prototype = { 
 isStudent:true,
 sayName:function(){
  alert(this.name);
 }
}
 
var people1 = new people('韓梅梅','女',16);  //實例化對象1
var people2 = new people('李磊','男',17);    //實例化對象2
 
//通過共享的方法讓兩個對象說出自己的名字
people1.sayName();
people2.sayName();
 
//通過共享的參數判斷他們都是學生
if(people1.isStudent == people2.isStudent)alert('他們都是學生');