Js建立對象的方式

使用構造器建立對象

function A1(username,pwd){
    this.username = username;
    this.pwd = pwd;
    this.say = function(){
       alert(11);
    }
    return this;
}

使用factory建立對象

function A2(username,pwd){
    var obj = new Object();
    obj.username = username;
    obj.pwd = pwd;
    return obj;
}

使用原型建立對象

function A3(){}
A.prototype.username = "張三";
A.prototype.pwd = "12354";

調用

var a1 = new A1("張珊","123456");
alert(a1.username+"--"+a1.pwd);

var a2 = new A2("張珊","123456");
alert(a2.username+"--"+a2.pwd);

var a3 = new A3();
alert(a.username+"--"+a3.pwd);