コンストラクタ内のset Dataとget Data

    //       
    function Person(name,age){
        this.name = name;
        this.age = age;
        //getters      
        this.getData = function(){
            return this.name;
        }
        //setters      
        this.setData = function(val){
            this.age = val;
        } 
    }

    var obj = new Person('wuyujie',23);
    console.log(obj.getData());//     wuyujie
    console.log(obj.age);//    age 23
    obj.setData(25);//  age
    console.log(obj.age);//25