JS中定义对象的几种方式

var Obj = new Object();
Obj.saysomething = function(){}
Obj.name = "";

function fun2(){}
function creatObject(parame){
    var object = new Object();
    //functionbody;
   object.f = function(){}    
　　object.f2 = fun2;
    return object;        
}
var Obj1 = creatObject(parame);
Obj1.f();
Obj1.f2();

funtion Obj(parame){
　　this.f1 = function(){}
}
var object = new Obj(parame);
object.f1();

function obj(){};
obj.prototype.value1 = val;
obj.prototype.value2 = new Array();
obj.prototype.fun = function(){};

var o = new obj();
obj.value1 = "";
obj.value2.push(parame);
obj.fun();

function Person()
{
       this.username = new Array();
       this.password = "123";
}

Person.prototype.getInfo = function()
{
       alert(this.username + ", " + this.password);
}

var p = new Person();
var p2 = new Person();

p.username.push("zhangsan");
p2.username.push("lisi");

p.getInfo();
p2.getInfo();

{
       this.username = "zhangsan";
       this.password = "123";

       if(typeof Person.flag == "undefined")
       {
              //此块代码应该只在第一次调用的时候执行
              alert("invoked");

              Person.prototype.getInfo = function()
              {
                     //这个方法定义在原型中，会被每一个对象所共同拥有
                     alert(this.username + ", " + this.password);
              }

              Person.flag = true;//第一次定义完之后，之后的对象就不需要再进来这块代码了

       }
}

var p = new Person();
var p2 = new Person();

p.getInfo();
p2.getInfo();