最简单的类

        function Person() {this.name = 'lisi';this.age = 20;}var p = new Person();alert(p.name);

构造函数和原型链里增加方法

        function Person() {this.name = 'lisi';this.age = 20;this.run = function() {alert(this.name + '在运动');}}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}var p = new Person();alert(p.name);p.run();p.work()

类里的静态方法

        function Person() {this.name = 'lisi';this.age = 20;this.run = function() {alert(this.name + '在运动');}}Person.getInfo = function() {alert('我是静态方法')}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}var p = new Person();// p.work();Person.getInfo()

es5里面的继承，对象冒充实现继承

只有一个弹框，说明没有继承到prototype上的方法

        function Person() {this.name = 'lisi';this.age = 20;this.run = function() {alert(this.name + '在运动');}}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}//Web类继承Person类function Web() {Person.call(this);}var w = new Web();w.run();w.work();

es5里面的继承，原型链实现继承

        function Person() {this.name = 'lisi';this.age = 20;this.run = function() {alert(this.name + '在运动');}}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}//Web类继承Person类function Web() {}Web.prototype = new Person();var w = new Web();w.run();w.work();

原型链实现继承的问题

        function Person(name, age) {this.name = name;this.age = age;this.run = function() {alert(this.name + '在运动');}}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}function Web(name, age) {}Web.prototype = new Person();var w = new Web('lisi', 20)w.run()w.work()

原型链+对象冒充的组合继承模式

        function Person(name, age) {this.name = name;this.age = age;this.run = function() {alert(this.name + '在运动');}}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}function Web(name, age) {Person.call(this, name, age);}Web.prototype = new Person();var w = new Web('lisi', 20)w.run()w.work()

原型链+对象冒充的另一种方式

        function Person(name, age) {this.name = name;this.age = age;this.run = function() {alert(this.name + '在运动');}}Person.prototype.sex = '男';Person.prototype.work = function() {alert(this.name + '在工作');}function Web(name, age) {Person.call(this, name, age);}Web.prototype = Person.prototype;var w = new Web('lisi', 20)w.run()w.work()