public class Script
   {
     public static void Alert(string message)
     {
       ResponseScript("alert('" + message + "');window.location = '弹出提示语后，点击确认跳到你想跳的页面';");
     }
     public static void ResponseScript(string script)
     {
       HttpContext.Current.Response.Write("<script type=\"text/javascript\">\n//<![CDATA[\n");
       HttpContext.Current.Response.Write(script);
       HttpContext.Current.Response.Write("\n//]]>\n</script>\n");
     }
   }

Script.Alert("你的提示语！");

$.ajax({
          type: "post",
          url: "/tools/ActApply.ashx",
          data: "txthdmoney=" + $.trim($("#hdmoneyx")[0].value)+"&sxf=2",
          success: function (result) {            
          }
        });

  protected decimal hdmoney;
    protected decimal hdsxf;
    /// <summary>
    /// 请求处理
    /// </summary>
    /// <param name="context"></param>
    public void ProcessRequest(HttpContext context)
    {
      Withdrawal withdra = new Withdrawal();
      context.Response.ContentType = "text/plain";
      hdmoney = Convert.ToDecimal(context.Request.Params["txthdmoney"].ToString());
      hdsxf = Convert.ToDecimal(context.Request.Params["sxf"].ToString());
      SaveAct();
    }
    public bool IsReusable
    {
      get
      {
        return false;
      }
    }