?//父類
function Person(name,age)
{
    this.Name=name;
    this.Age=age;
    this.Display=function()
    {
        alert("my age is "+ this.Age);
    }
}
Person.prototype.talk=function(){alert(this.Name+" is talking!");};

//子類
//function SubPerson(name)
//{
//    this.Name=name;
//}
//SubPerson.prototype=new Person(this.Name,"19");


function PersonTalk()
{
    var person=new Person("dong",19);
    person.Display();
}