js面向对象之继承-原型继承
//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();
封装一个函数后:
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();
给函数添加extends方法
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();
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