EXTJS 简单登陆

 
    function ready()
    {
       var form1=new Ext.form.FormPanel({
         id:'loginForm',
         items:[
                {xtype:"textfield",id:"userName",fieldLabel:"用户名",allowBlank:false,blankText:'请输入用户名！',emptyText:"请输入用户名"},
                {xtype:"textfield",inputType:'password',id:"pwd",fieldLabel:"密码",allowBlank:false,blankText:'请输入密码！'}
               ]
     
      
       });
      
       var win
       if(!win)
       {
         var win=new Ext.Window({
            title:"登陆",
            width:300,
            height:150,
            id:"loginWindow",
            modal:true,
            items:[form1],
            buttons:[
                     {xtype:"button",id:'btnSubmit',text:'登陆',handler:login},
                     {xtype:"button",inputType:'reset',id:'重置',text:'重置'}
                    ]
       });
       }
       win.show();
      
       function login()
       {
     
         var userName=Ext.getCmp("userName").getValue();
         var pwd=Ext.getCmp("pwd").getValue();

         if(Ext.util.Format.trim(userName)==""||Ext.util.Format.trim(pwd)=="")
         {
            Ext.Msg.alert("提示","用户名或密码不能为空！");
            return;
         }
         Ext.Ajax.request({
                          url:"submit.aspx",
                          method:'GET',//注意  如果有params指定参数  method没有显示制定 它用POST提交！！！
                          params:{paramType:"login",paramUserName:userName,paramPwd:pwd},
                         success:function(response,options)
                       {
                       var obj= Ext.util.JSON.decode(response.responseText);

                       //Ext.util.JSON.decode（）将Json格式数据重构成对象   Ext.util.JSON.encode（）反之!
                      if(obj.success)
                      {
                       Ext.Msg.alert("消息","恭喜您登陆成功！");
                      }
                   else{
                       Ext.Msg.alert("消息","用户名或密码错误！");
                   }
                }
         })
             Ext.onReady(ready);

==================submit.aspx页面==================================

后台:

    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString["paramType"]=="login")
        {

//模仿验证
            if (Request.QueryString["paramUserName"] == "zhang" && Request.QueryString["paramPwd"] == "12345")
            {
                Response.Write("{success:true}");//返回JSON数据格式
                Response.End();
            }
            else {
                Response.Write("{success:false}");
                Response.End();
            }

        }
        Response.Write("{success:false}");
    }

       
       }
   
    }