JS OOP编程

//父类
function BaseFun() {
    var hello = "HelloWorld";
    this.HelloPublic = "Hello--World";
 
    var privatefun = function () {
        alert("hellow");
    }
 
    this.publicfun = function () {
        var a = this.HelloPublic;
        alert("this is public funtion" + a);
    }
}
 
//子类
function  SubFun() {
    BaseFun.apply(this, arguments);// 建立继承关系
    this.SubHello = function () {
        alert("sub ok");
    }
}
 
//动物基类
function  BaseAnimal() {
    this.Type = "Animal";
    this.Eat = function () {
        alert(this.Type + "会吃东西方法");
    }
    this.Walter = function () {
        alert(this.Type + "喝水");
    }
}
 
//猪子类
function  Pie() {
    //子类方法覆盖父类方法
    this.Eat = function (arg) {
        alert(arg);
    }
}
 
//狗子类
function Dog() {
 
}
//prototype属性，指定为该属性的值，该构造器的实例对象自动继承
Dog.prototype={
    eatfood:function () {
        alert("吃东西");
    },
    sleep:function () {
        alert("睡觉");
    }
};

     function  getFun() {
            var basef=new BaseFun();
            var a=basef.HelloPublic;
 
            basef.HelloPublic="我是父类";
            basef.publicfun();
 
            var sub=new SubFun();
            sub.HelloPublic="我是子类";
            sub.publicfun();
 
            var pie=new Pie();
            pie.Eat("吃东西");
 
            //建立继承关系
            Pie.prototype=new BaseAnimal();
            var p=new Pie();
            p.Type="猪";
            p.Walter();
 
            var dog=new Dog();
            dog.sleep();
            dog.eatfood();
        }