首先，新建Login.html页面：
<!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>$.ajax()方法发送请求</title> <script type="text/javascript" src="Scripts/jquery-1.4.1.js"></script> <style type="text/css"> body { font-size: 13px; } .divFrame { width: 225px; border: solid 1px #666; } .divFrame .divTitle { padding: 5px; background-color: #eee; height: 23px; } .divFrame .divTitle span { float: left; padding: 2px; padding-top: 5px; } .divFrame .divContent { padding: 8px; text-align: center; } .divFrame .divContent .clsShow { font-size: 14px; line-height: 2.0em; } .divFrame .divContent .clsShow .clsError { font-size: 13px; border: solid 1px #cc3300; padding: 2px; display: none; margin-bottom: 5px; background-color: #ffe0a3; } .txt { border: #666 1px solid; padding: 2px; width: 150px; margin-right: 3px; } .btn { border: #666 1px solid; padding: 2px; width: 50px; } </style> <script type="text/javascript"> $(function () { $("#txtName").focus();//输入焦点 $("#txtName").keydown(function (event) { if (event.which == "13") {//回车键,移动光标到密码框 $("#txtPass").focus(); } }); $("#txtPass").keydown(function (event) { if (event.which == "13") {//回车键，用.ajax提交表单 $("#btnLogin").trigger("click"); } }); $("#btnLogin").click(function () { //“登录”按钮单击事件 //获取用户名称 var strTxtName = encodeURI($("#txtName").val()); //获取输入密码 var strTxtPass = encodeURI($("#txtPass").val()); //开始发送数据 $.ajax ({ //请求登录处理页 url: "Login.aspx", //登录处理页 dataType: "html", //传送请求数据 data: { txtName: strTxtName, txtPass: strTxtPass }, success: function (strValue) { //登录成功后返回的数据 //根据返回值进行状态显示 if (strValue == "True") {//注意是True,不是true $(".clsShow").html("操作提示，登录成功！" + strValue); } else { $("#divError").show().html("用户名或密码错误！" + strValue); } } }) }) }) </script> </head> <body> <form id="frmUserLogin"> <div class="divFrame"> <div class="divTitle"> <span>用户登录</span> </div> <div class="divContent"> <div class="clsShow"> <div id="divError" class="clsError"> </div> <div> 名称：<input id="txtName" type="text" class="txt" /></div> <div> 密码：<input id="txtPass" type="password" class="txt" /></div> <div> <input id="btnLogin" type="button" value="登录" class="btn" />   <input id="btnReset" type="reset" value="取消" class="btn" /> </div> </div> </div> </div> </form> </body> </html> 然后，新建Login.aspx，接收并处理数据：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="JSDemo.Login" ResponseEncoding="gb2312"%> <% string strName = System.Web.HttpUtility.UrlDecode(Request["txtName"]); string strPass = System.Web.HttpUtility.UrlDecode(Request["txtPass"]); bool login = false; if (strName == "admin" && strPass == "admin") { login = true; } Response.Write(login); %>