js的几种继承方式
2009-10-10 18:29
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| <script type="text/javascript"> function Person(name, address) { this.Name = name; this.Address = address; } Person.prototype.Show = function() { return this.Name; } //使用call 继承 function user(name, address) { Person.call(this, name, address) this.Tel = "134010842**"; } //使用apply 继承 function user2(name, address) { Person.apply(this, arguments) //apply第二个参数是参数数组,所以可以使用arguments（这是和call的区别） this.Tel = "134010842**"; } //使用prototype 继承 user3.prototype = new Person(); //建一个基类的对象作为子类原型的原型,这样子类才会继承父类的方法 function user3(name, address) { Person.apply(this, arguments); this.Tel = "134010842**"; } var user1 = new user("江湖小子1", "四川"); alert(user1.Name + "-" + user1.Tel + "-" + user1.Address); var user2 = new user2("江湖小子2", "北京"); alert(user2.Name + "-" + user2.Tel + "-" + user2.Address); var user3 = new user3("江湖小子3", "上海"); alert(user3.Name + "-" + user3.Tel + "-" + user3.Address); </script> Javascript面向对象： <script type="text/javascript"> var Bus; //构造函数 if (Bus == undefined) { Bus = function(name, num) { this.Init(name, num); }; } Bus.prototype.Init = function(name, num) { this.Name = name; this.Num = num; } //静态成员 Bus.City = "静态北京"; Bus.GetCity = function() { return Bus.City; } //实例成员 Bus.prototype.City = "实例北京"; Bus.prototype.Show = function() { return this.Name + "-" + this.Num; } var bus = new Bus("公交车", "100"); alert(bus.City); //实例北京 alert(bus.Show()); //公交车 - 100 alert(Bus.City); //静态北京 alert(Bus.GetCity()); //静态北京 </script> |
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