简单的登录功能（未连接数据库）
代码如下：

script src="Jquery1.7.js" type="text/javascript"/script
script type="text/javascript"
$(function () {
$('#tijiao').click(function () {
var username = $('#username').val();
var pwd = $('#pwd').val();
$.ajax({
type: "post",
contentType: "application/json",
url: "WebService1.asmx/denglu",
data: "{username:'" + username + "',pwd:'" + pwd + "'}",
success: function (bukeyi) {
$('#tishi').text(bukeyi.d);
}
})
})
})
/script
/head
body
用户名：input type="text" id="username" runat="server" /
密码：input type="text" id="pwd" runat="server" /
input type="button" id="tijiao" value="提交" /
div id="tishi"/div
[WebMethod]
public string denglu(string username,string pwd)
{
if (username == "zhangsan" && pwd == "123")
{
return "登陆成功！";
}
else { return "登陆失败！"; }
}