//普通对象

//函数对象（有原型 prototy 的属性）

//原型的应用 继承

function Amial(){

    this.type = '小于'

}

function cat(name){

    this.name = name

}

cat.prototype = new Amial()

var cat1 = new cat('小张')

console.log(cat1.name,cat1.type)

//构造器  继承 缺点：把父元素的属性都复制了

function Amial(){

    this.type = '动物'

}

function amm(name){

    Amial.apply(this) //调用Amial构造器 Amial == amm

    //Amial.call(this,x,y,z)  Amial.apply(this,[x,y,z])

    this.name = name

}

var a = new amm('张三')

console.log(a.type)

//组合继承(原型+构造器) 缺点：调用两次父类构造器

function Preson(name){

    this.arr = ['js','php']

    this.name = name

}

Preson.prototype.showname = function(){

    console.log(this.name)

}

function teacher(name,gread){

    Preson.call(this,name)

    this.gread = gread

}

teacher.prototype = new Preson() // 最关键的一句

var a = new teacher('xiaoming', 23)

console.log(a.arr,a.name,a.gread)

a.showname()

//原型+构造+寄生

function father(name){

    this.arr = ['aa','bb']

    this.name = name

}

father.prototype.showname = function(){

   console.log(this.name)

}

function son(name,course){

   father.call(this,name)

   this.course = course

}

function extend(subobj,superobj){

   var proobj = Object.create(superobj.prototype)

   subobj.prototype = proobj

}

extend(son, father)

var a = new son('xiaoming', 23)

console.log(a.arr,a.name,a.course)

a.showname()