防止重复刷新无效？该怎么处理

防止重复刷新无效？

PHP code

//phpif(!empty($_GET['cloDept']) && !empty($_GET['cloUnit'])){        $mysql->removeAlarm($_GET['cloUnit'],$_GET['cloDept']);        echo "<script language='javascript'>alert('refresh-->><<');        Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);        Response.Expires = 0;        Response.Buffer = true;        Response.ExpiresAbsolute = DateTime.Now.AddSeconds(-1);        Response.AddHeader('pragma', 'no-cache');        Response.CacheControl = 'no-cache';        </script>";        header('index.php');    }<Meta http-equiv="Refresh" Content="10"><a style='font-size:12px' href='map.php?cloDept=<?=$marks['dept']?>&cloUnit=<?=$marks['unit']?>'>提交</a>