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1.js class inheritance
/* -- 类式继承 -- */ //先声明一个超类 function Person(name) { this.name = name; } //给这个超类的原型对象上添加方法 getName Person.prototype.getName = function() { return this.name; } //实例化这个超 var a = new Person('Darren1') console.log(a.getName());//Darren1 //再声明类 function Programmer(name, sex) { //这个类中要调用超类Person的构造函数,并将参数name传给它 Person.call(this, name); this.sex = sex; } //这个子类的原型对象等于超类的实例 Programmer.prototype = new Person(); //因为子类的原型对象等于超类的实例,所以prototype.constructor这个方法也等于超类构造函数,你可以自己测试一下,如果没这一步,console.log(Programmer.prototype.constructor这个是Person超类的引用,所以要从新赋值为自己本身 console.log(Programmer.prototype.constructor); /*function Person(name) { this.name = name; } */ Programmer.prototype.constructor = Programmer; console.log(Programmer.prototype.constructor); /*function Programmer(name, sex) { Person.call(this, name); this.sex = sex; } */ //子类本身添加了getSex 方法 Programmer.prototype.getSex = function() { return this.sex; } //实例化这个子类 var _m = new Programmer('Darren2', 'male'); //自身的方法 console.log(_m.getSex());//male //继承超类的方法 console.log(_m.getName());//Darren2
2.js prototypal inheritance
/* -- 原型式继承 -- */ //clone()函数用来创建新的类Person对象 var clone = function(obj) { 4 var _f = function() {}; //这句是原型式继承最核心的地方,函数的原型对象为对象字面量 _f.prototype = obj; return new _f; } //先声明一个对象字面量 var Person = { name: 'Darren', getName: function() { return this.name; } } //不需要定义一个Person的子类,只要执行一次克隆即可 var Programmer = clone(Person); //可以直接获得Person提供的默认值,也可以添加或者修改属性和方法 alert(Programmer.getName()) Programmer.name = 'Darren2' alert(Programmer.getName()) //声明子类,执行一次克隆即可 var Someone = clone(Programmer);
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