EXTJS 資料 Ext.Ajax.request 獲取返回數據

下面是一個登陸頁面調用的EXTJS

login function，通過  url: '/UI/HttpHandlerData/Login/Login.ashx',獲取返回登陸賬戶和密碼！

Ext.onReady(function () {

    login = function (target) {
        if (eval(document.getElementById('TxtUserName')).value == "") {
            alert("提示! 請輸入賬戶!"); return false;
        }
        else if (eval(document.getElementById('TxtPassword')).value == "") {
            alert("提示!請輸入密碼!"); return false;
        }
        else {
            var username = eval(document.getElementById('TxtUserName')).value;
            var password = eval(document.getElementById('TxtPassword')).value;

            Ext.Ajax.request({
                url: '/UI/HttpHandlerData/Login/Login.ashx',
                method: 'POST',
                clientValidation: true,
                waitMsg: '正在提交數據...',
                waitTitle: '提示',
                params: {
                    username: username,
                    password: password
                },
                success: function (response) {
                    var data = Ext.decode(response.responseText);
                    //設置Cookie
                    new Extjs.cookie.set(data.userid, data.username);
                    window.location.href = "../Page/InformationManagement/Index.html";
                },
                failure: function () {
                    Ext.Msg.alert("提示", "登陸失敗，請與管理員聯系！");
                }
            });
        }
    }
});

后台代碼：

這是在一般處理程序中的代碼：

  public void ProcessRequest(HttpContext context)
        {


            string username = context.Request.Form["username"];
            string password = context.Request.Form["password"];
            int intUserID = 0;
            DataSet ds = saBLL.Login(username, password);

            //客戶端輸出變量
            string strResult = string.Empty;
            if (ds.Tables[0].Rows.Count > 0)
            {
                //用戶不存在
                if (ds == null)
                    strResult = "{success:true,flag:false,msg:'用戶不存在!'}";
                //用戶密碼不正確
                else if (ds.Tables[0].Rows[0]["Password"].ToString() != password)
                    strResult = "{success:true,flag:false,msg:'用戶密碼不正確!'}";
                //正確
                else
                {
                    intUserID = Convert.ToInt32(ds.Tables[0].Rows[0]["AccountId"].ToString());
                    strResult = "{success:'true',flag:'true',userid:'" + intUserID + "',username:'" + ds.Tables[0].Rows[0]["LoginName"] + "'}";
                }
            }
            else
            {
                strResult = "{success:true,flag:false,msg:'用戶不存在!'}";
            }

            //客戶端輸出
            context.Response.Write(strResult);

        }