A simple example of inheritance in javascript_javascript skills

//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();