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