選取刪除與ajax？

<code><button class="box" data-removetype="select_del">刪除</button>
<form id="selectid">
<? while ($row = mysql_fetch_array($s))
{
       <input type="checkbox" name="id[]" value="<? echo $row['mail_id'];?>">
 }
 ?>
 </form>
 
 $(".box").click(function(e){
    var removetype = e.currentTarget.dataset.removetype;
    /*mailbox*/
    if (removetype=='select_del')
    {
        $.ajax({
                type: "POST",
                url:"del?to="+removetype,
                data:$("#selectid").serialize(),
                cache: false,
                success: function(){
                
                }
            });
    }
});
</code>

<code>$user = $_GET['to'];
if ($user=='select_del')
{
    $getid=$_POST['id'];
    foreach($getid as $value)
    {
        $DEL = mysql_query("
        DELETE FROM `資料表名稱`
        WHERE `id` = '".$value."'
        ");
     }
}
</code>

<code><button class="box" data-removetype="select_del">刪除</button>
<form id="selectid">
<? while ($row = mysql_fetch_array($s))
{
       <input type="checkbox" name="id[]" value="<? echo $row['mail_id'];?>">
 }
 ?>
 </form>
 
 $(".box").click(function(e){
    var removetype = e.currentTarget.dataset.removetype;
    /*mailbox*/
    if (removetype=='select_del')
    {
        $.ajax({
                type: "POST",
                url:"del?to="+removetype,
                data:$("#selectid").serialize(),
                cache: false,
                success: function(){
                
                }
            });
    }
});
</code>

<code>$user = $_GET['to'];
if ($user=='select_del')
{
    $getid=$_POST['id'];
    foreach($getid as $value)
    {
        $DEL = mysql_query("
        DELETE FROM `資料表名稱`
        WHERE `id` = '".$value."'
        ");
     }
}
</code>

<code>data:$("#selectid").serialize()</code>

<code>data:$("#selectid").find('input').serialize()</code>

<code><? while ($row = mysql_fetch_array($s))
{
       <input type="checkbox" name="id[]" value="<? echo $row['mail_id'];?>">
 }
 ?></code>