js 共有和私有

//共有
var SunHang = function(){
  var name = "ssss";
   this.name = "hhhhh";
   function getName(){}
   this.getName = function(){
     return this.name;
    }
}
var aaa = new SunHang()
aaa.getName()    //hhhhh

//私有
var SunHang = function(){
  var name = "ssss";
   this.name = "hhhhh";
   function getName(){}
   this.getName = function(){
     return name;
    }
}
var aaa = new SunHang()
aaa.getName()    //ssss