个人平时常用的两种js类写法

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >
   < html >
   < head >
     < meta  http-equiv ="content-type"  content ="text/html;charset=utf-8" />
     < script  type ="text/javascript" >
     //  第一种
     var  Test1  =   function (){
         var  name  =   "" ;
         this .setName  =   function (username){
            name  =  username;
        }
         this .getName  =   function (){
             return  name;
        }
         this .sayHello  =   function (){
             return   " Hello  "   +   this .getName();
        }
         return   this ;
    }();
    Test1.setName( " penngo " );
    console.log( " Test1====== "   +  Test1.getName());
    console.log( " Test1====== "   +  Test1.sayHello());

     //  第二种
     var  Test2  =   function (){
         var  name  =   "" ;
         return  {
            setName: function (username){
                name  =  username;
            },
            getName: function (){
                 return  name;
            },
            sayHello: function (){
                 return   " Hello  "   +   this .getName();
            }
        };
    }();
    Test2.setName( " penngo " );
    console.log( " Test2====== "   +  Test2.getName());
        console.log( " Test2====== "   +  Test2.sayHello());
     </ script >
   </ head >
   < body >
   </ body >
   </ html >