<form id="submitForm" action="leave.ashx" method="post">
您的真实姓名：<input type="text" id="realName" name="realName"  />
<input type="submit" value="测试" />
</form>    
<script>
function leave(des){
   //这里测试用只有弹框，实质上需要做其他html页面上的处理
   alert(des);
}
</script>

<%@ WebHandler Language="C#" Class="leave" %>

using System;
using System.Web;
using System.Data.OleDb;
using System.Data;
using System.Web.SessionState;
using System.Text;

public class leave : IHttpHandler, IReadOnlySessionState
{

    public void ProcessRequest(HttpContext hc)
    {
        hc.Response.ContentType = "text/html";
        hc.Response.Charset = "UTF-8";

        string realName = hc.Request.Form["realName"].ToString();
        string str = "提交成功！";

        hc.Response.Write("<script language='javascript' type='text/javascript'>leave('" + str + "');</script>");
        hc.Response.End();
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}