【 tulaoshi.com - Web开发 】
                             
                            代码如下: 
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" 
html xmlns="http://www.w3.org/1999/xhtml" 
head 
title/title 
script src="js/Jquery1.7.js" type="text/javascript"/script 
script type="text/javascript" 
$(function () { 
$('#Button1').click(function () { 
var username = $('#txtUserName').val(); 
var pwd = $('#txtPwd').val(); 
$.ajax({ 
type: "post", 
contentType: "application/json", 
url: "WebService1.asmx/Login", 
data: "{username:'" + username + "',pwd:'" + pwd + "'}", 
success: function (bukeyi) { 
if (bukeyi.d == 'true') { 
window.location = 'HTMLPage1.htm'; 
} 
else { 
$('#divinfo').text("用户名或密码错误"); 
} 
} 
}) 
}) 
}) 
/script 
/head 
body 
用户名input id="txtUserName" type="text" /br / 
密码input id="txtPwd" type="text" /br / 
input id="Button1" type="button" value="登录" /br / 
div id="divinfo"/div 
/body 
/html  
------WebService1.asmx---- 
代码如下: 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.Services; 
namespace ajax11 
{ 
/// summary 
/// WebService1 的摘要说明 
/// /summary 
[WebService(Namespace = "http://tempuri.org/")] 
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 
[System.ComponentModel.ToolboxItem(false)] 
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务,请取消对下行的注释。 
[System.Web.Script.Services.ScriptService] 
public class WebService1 : System.Web.Services.WebService 
{ 
[WebMethod] 
public string HelloWorld() 
{ 
return "Hello World"; 
} 
[WebMethod] 
public string ValidateUser(string username) 
{ 
if (username == "onlifes") 
{ 
return "用户名已被占用,请选择其他"; 
} 
else 
{ 
return "可以使用,请继续"; 
} 
} 
[WebMethod] 
public string GetDate() 
{ 
return DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"); 
} 
[WebMethod] 
public string Login(string username, string pwd) 
{ 
if (username == "admin" && pwd == "888888") 
{ 
return "true"; 
} 
else 
{ return "false"; } 
} 
} 
}