//animal 父类 超类        var Animal = function(name)        {            this.name = name;            this.sayhello = function()            {                alert("HI，我是" + this.name + "，你愿意和我做朋友吗？");            };        };        Animal.prototype.shout = function()        {            alert(this.name + "，正在叫！");        };        Animal.prototype.game = function()        {            alert(this.name + "，正在玩耍！");        };                var Dog = function(name)        {            //this.name = name;            this.name = name;            this.shout = function()//重写父类的函数            {                alert(this.name + "，正在汪汪叫！");            };        };                var Cat = function(name)        {            this.name = name;            this.shout = function()            {                alert(this.name + "，正在喵喵叫！");            };        };                //原型继承        Dog.prototype = Cat.prototype = new Animal();                var xh = new Dog("小黑");        xh.sayhello();        xh.shout();        xh.game();                var xm = new Cat("小咪");        xm.sayhello();        xm.shout();        xm.game();

var inherit = function (subclass, superclass) {    subclass.prototype = new superclass();}; //animal 父类 超类var Animal = function (name) {    this.name = name;    this.sayhello = function () {        alert("HI，我是" + this.name + "，你愿意和我做朋友吗？");    };};Animal.prototype.shout = function () {    alert(this.name + "，正在叫！");};Animal.prototype.game = function () {    alert(this.name + "，正在玩耍！");}; var Dog = function (name) {    //this.name = name;    this.name = name;    this.shout = function () //重写父类的函数    {        alert(this.name + "，正在汪汪叫！");    };}; var Cat = function (name) {    this.name = name;    this.shout = function () {        alert(this.name + "，正在喵喵叫！");    };}; //原型继承//Dog.prototype = Cat.prototype = new Animal();inherit(Dog, Animal);inherit(Cat, Animal); var xh = new Dog("小黑");xh.sayhello();xh.shout();xh.game(); var xm = new Cat("小咪");xm.sayhello();xm.shout();xm.game();

Function.prototype.extends = function (superclass) {    this.prototype = new superclass();}; //animal 父类 超类var Animal = function (name) {    this.name = name;    this.sayhello = function () {        alert("HI，我是" + this.name + "，你愿意和我做朋友吗？");    };};Animal.prototype.shout = function () {    alert(this.name + "，正在叫！");};Animal.prototype.game = function () {    alert(this.name + "，正在玩耍！");}; var Dog = function (name) {    this.name = name;    this.shout = function () //重写父类的函数    {        alert(this.name + "，正在汪汪叫，叫的很开心！");    };};Dog.extends(Animal); var Cat = function (name) {    this.name = name;    this.shout = function () {        alert(this.name + "，正在喵喵叫！");    };};Cat.extends(Animal); //原型继承//Dog.prototype = Cat.prototype = new Animal();/*inherit(Dog, Animal);        inherit(Cat, Animal);*///Dog.extends(Animal);//Cat.extends(Animal); /*var xh = new Dog("小黑");        xh.sayhello();        xh.shout();        xh.game();                 var xm = new Cat("小咪");        xm.sayhello();        xm.shout();        xm.game();*/ var Husky = function (name, color, sex) {    this.name = name;    this.color = color;    this.sex = sex;    this.sayhello = function () {        alert("Hello，我是一条小" + this.sex + "狗，有一个非常好听的名字，叫：“" + this.name + "”，你愿意和我做朋友吗？");    };    this.showcolor = function () {        alert(this.color);    };    /*this.shout = function()//重写父类的函数            {                alert(this.name + "，哼哼叫！");            };*/};Husky.extends(Dog); var xh = new Husky("小哈", "黑白", "公");xh.sayhello();xh.shout();xh.game();xh.showcolor();