ajax相关

    <script language="javascript" type="text/javascript" src="../js/Common/jquery-1.4.2.min.js"></script>
        <script type="text/javascript">
            $(function () {
                var name = $("#loginname");
                var password = $("#password");
                $("#submit").click(function () {

                    if (name.val() == "") {
                        alert("???? ??????.");
                        name.focus();
                        return false;
                    } if (password.val() == "") {
                        alert("????? ?????.");
                        password.focus();
                        return false;
                    }

                    $.ajax({
                        type: ‘post‘,
                        url: ‘Login.ashx‘,
                        data: ‘loginname=‘ + name.val() + "&password=" + password.val(),
                        success: function (text) {
                            if (text == "e") {
                                alert("??? ??? ??????！");
                                return false;
                            }
                            else if (text == "s") {
                                window.location.href = "../index.aspx";
                            }
                        }
                    });
                });
            });

            function Submit() {
                if (event.keyCode == 13) {
                    $("#submit").click();
                }
            }

    </script>

<%@ WebHandler Language="C#" Class="Login" %>

using System;
using System.Web;
using Service;
using Dao;

public class Login : IHttpHandler {
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";

        string username = context.Request.Form["loginname"].ToString();
        string password = context.Request.Form["password"].ToString();

        Tb_User user = ServiceLocator.UserService.UserModel(username.Trim(), System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password.Trim(), "MD5").ToLower());

        if (null == user)
            context.Response.Write("e");    //确认登录信息【error】
        else
        {
            UIBase.Login(user.UserID.ToString(), user.UserName.Trim(), user.Realname.Trim());
            context.Response.Write("s");    //登录成功【succeed】
        }
        
    }
    public bool IsReusable {
        get {
            return false;
        }
    }

}