javascript实现继承的简单实例

//继承function Person(name,sex){ this.name=name; this.sex=sex;}Person.prototype.sayName=function(){ alert(this.name);}Person.prototype.saySex=function(){ alert(this.sex);}function Worker(name,sex,job){ //继承person类  Person.call(this,name,sex) //这里的this指的是Worker类的实例，如下面的'W' ,把W传入Person构造函数，这时W伪装成Person构造函数里的this this.job=job;}//Worker.prototype=Person.prototype;//如果这样负值原型，子类的sayJob方法Person父类也会有sayJob方法，因为是引用传递//改成如下方式则子类不会影响父类：for(var i in Person.prototype){ Worker.prototype[i]=Person.prototype[i];}Worker.prototype.sayJob=function(){ alert(this.job);}var p=new Person('lisi','男');//alert(p.sayJob);var w=new Worker('zhangsan','男','打酱油的');w.sayName();w.saySex();w.sayJob();