function Student(name,age,sex,phone){
//继承方法
Person.call(this,name,age)
//添加自己的属性
this.sex=sex
this.phone=phone
//添加自己的方法
this.say()
}
//继承父类的属性
for(var i in Person.prototype){
Student.prototype[i]=Person.prototype[i]
}
//重写父类方法
Student.prototype.say()
{
alert(this.phone+' 'this.sex)
}
很少用继承，简单举个例子好了。
<script>
Animal.prototype.speak = function(){
console.log("我叫:"+this.name+" 叫声是:"+this.yell)
}
function Animal(name,yell){//动物类(祖父类)
this.name=name
this.yell = yell
}
//---------------------------------------------------
Felidae.prototype = new Animal()
Felidae.prototype.constructor = Felidae
function Felidae(name,yell){//猫科(父类)
Animal.call(this,name,yell)
}
//---------------------------------------------------
ManchurianTiger.prototype = new Felidae()
ManchurianTiger.prototype.constructor = ManchurianTiger
function ManchurianTiger(name,yell){//东北虎(子类)
Felidae.call(this,name,yell)
}
//---------------------------------------------------
var tiger = new ManchurianTiger("虎子","吼吼~")
tiger.speak()
</script>
运行结果：我叫:虎子 叫声是:吼吼~
