AJAX

JS

function Ajax(obj) {
    var instance = new Object();
    //instance.XMLHttpReq;
    instance.url = obj.url;
    instance.backFunction = obj.callback;
    instance.cache = obj.cache == undefined ? false : obj.cache; //默认缓存为false
    // 创建XMLHttpRequest对象
    createXMLHttpRequest = function() {
        if (window.XMLHttpRequest) {//Mozilla浏览器
            instance.XMLHttpReq = new XMLHttpRequest();
        }
        else if (window.ActiveXObject) {
            try {
                instance.XMLHttpReq = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    instance.XMLHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) { }
            }
        }
    };
    // 发送请求函数
    sendRequest = function(url) {
        this.createXMLHttpRequest();
        //if (!instance.cache) {
            //instance.XMLHttpReq.setRequestHeader("If-Modified-Since", "0");
        // }
        // 发送请求
        instance.XMLHttpReq.open("GET", url, true);
        instance.XMLHttpReq.onreadystatechange = this.processResponse; //指定响应函数    
        instance.XMLHttpReq.send(null);
    };
    //处理响应函数
    processResponse = function() {
        if (instance.XMLHttpReq.readyState == 4) {//判断对象状态
            if (instance.XMLHttpReq.status == 200) {// 信息已经成功返回，开始处理信息
                instance.backFunction(instance.XMLHttpReq.responseText);
                instance = null;
            } else {
                //alert("您所请求的页面有异常");
                instance = null;
            }
        }
    };
    sendRequest(instance.url);
}

调用函数

function checkLogin() {
            var uname = JsCore.$$("uname").value;
            var upass = JsCore.$$("upass").value;
            Ajax({
                url: "/class/checkvcode.aspx?vcode=1&uname=" + uname + "&upass=" + upass + "&num=" + Math.random(), callback: function (data) {
                    if (data != "") {
                        if (data == "3") {
                            location.href = "/member/default.aspx";
                        }
                        if (data == "1") {
                            //alert('用户名或密码输入错误！');
                            JsCore.$$("uname_msg").style.display = "block";
                            JsCore.$$("upass_msg").style.display = "block";
                        }
                    }
                }
            });
        }

 调用页面

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace Web.Class
{
    public partial class CheckVcode : System.Web.UI.Page
    {
        private string vcode = string.Empty;
        private string uname = string.Empty;
        private string upass = string.Empty;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Request["vcode"].ToString() != null && Request["vcode"].ToString() != "")
            {
                if (Request["uname"].ToString() == "" && Request["upass"].ToString() == "")
                {
                    vcode = Request["vcode"].ToString().ToUpper();
                    string code = Session["CheckCode"].ToString().Trim().ToUpper();
                    if (vcode == code)
                    {
                        Response.Write("yes");
                        Response.End();
                    }
                    else
                    {
                        Response.Write("no");
                        Response.End();
                    }
                }
                else
                {
                    uname = Request["uname"].ToString();
                    upass = Request["upass"].ToString();
                    if (CheckLogin(uname, upass) == false)
                    {
                        Response.Write("1");
                        Response.End();
                    }
                    else
                    {
                        if (CheckPass(uname, upass) == true)
                        {
                            //创建Cookie
                            HttpCookie cookie = Request.Cookies["UserID"];
                            if (cookie == null)
                            {
                                cookie = new HttpCookie("UserID");
                            }
                            cookie.Values.Set("ID", GetId(uname, upass)["ID"].ToString());
                            Response.SetCookie(cookie);

                            Response.Write("3");
                            Response.End();
                        }
                    }
                }
            }
            else
            {
                Response.Write("yes");
                Response.End();
            }
        }

        private bool CheckLogin(string uname,string upass)
        {
            StringBuilder sqlStr = new StringBuilder();
            sqlStr.Append(@"select * from enterprise where orgcode=@uname and pwd=@upass");
            SqlParameter[] parameter = {
                                       new SqlParameter("@uname",SqlDbType.VarChar),
                                       new SqlParameter("@upass",SqlDbType.VarChar)                                       
                                       };
            parameter[0].Value = uname;
            parameter[1].Value = upass;
            return DataHelper.Exists(sqlStr.ToString(), parameter);
        }
        private bool CheckNoPass(string uname, string upass)
        {
            StringBuilder sqlStr = new StringBuilder();
            sqlStr.Append(@"select * from enterprise where orgcode=@uname and pwd=@upass and status=0");
            SqlParameter[] parameter = {
                                       new SqlParameter("@uname",SqlDbType.VarChar),
                                       new SqlParameter("@upass",SqlDbType.VarChar)                                       
                                       };
            parameter[0].Value = uname;
            parameter[1].Value = upass;
            return DataHelper.Exists(sqlStr.ToString(), parameter);
        }
        private bool CheckPass(string uname, string upass)
        {
            StringBuilder sqlStr = new StringBuilder();
            sqlStr.Append(@"select * from enterprise where orgcode=@uname and pwd=@upass");
            SqlParameter[] parameter = {
                                       new SqlParameter("@uname",SqlDbType.VarChar),
                                       new SqlParameter("@upass",SqlDbType.VarChar)                                       
                                       };
            parameter[0].Value = uname;
            parameter[1].Value = upass;
            return DataHelper.Exists(sqlStr.ToString(), parameter);
        }

        private DataRow GetId(string uname, string upass)
        {
            StringBuilder sqlStr = new StringBuilder();
            sqlStr.Append(@"select * from enterprise where orgcode=@uname and pwd=@upass");
            SqlParameter[] parameter = {
                                       new SqlParameter("@uname",SqlDbType.VarChar),
                                       new SqlParameter("@upass",SqlDbType.VarChar)                                        
                                       };
            parameter[0].Value = uname;
            parameter[1].Value = upass;
            return DataHelper.QueryRow(sqlStr.ToString(), parameter);
        }
    }
}