准备好Server端的方法

[System.Web.Services.WebMethod]public static string VeryUserName(string name){string rtn = "恭喜，此帐号还没有注册，你可以使用。";if (name == "")rtn = "请填写一个注册帐号。";if (name == "Insus.NET")rtn = "此用户已经注册，请使用另外帐号。"; return rtn;}

HTML代码：

<asp:TextBox ID="TextBoxAccount" runat="server"></asp:TextBox><br /><input id="btnrReg" type="button" value="注册" onclick="VeryRegAccount()" />

Javascript脚本：

<script src="scripts/jquery-1.3.2.min.js" type="text/javascript"></script> <script type="text/javascript"> function VeryRegAccount() { $.ajax({ type: "POST", url: "Default.aspx/VeryUserName", data: '{name: "' + $("#<%= TextBoxAccount.ClientID%>")[0].value + '" }', contentType: "application/json; charset=utf-8", dataType: "json", success: OnSuccess, failure: function (response) { alert(response.d); } }); } function OnSuccess(response) { alert(response.d); } </script>