準備好Server端的方法
[System.Web.Services.WebMethod]public static string VeryUserName(string name){string rtn = "恭喜，此帳號還沒有注冊，你可以使用。";if (name == "")rtn = "請填寫一個注冊帳號。";if (name == "Insus.NET")rtn = "此用戶已經注冊，請使用另外帳號。"; return rtn;} HTML代碼：
<asp:TextBox ID="TextBoxAccount" runat="server"></asp:TextBox><br /><input id="btnrReg" type="button" value="注冊" onclick="VeryRegAccount()" />
Javascript腳本：
<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> 
