对循环对象的特定某个操作

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 <td>
   <select name="awardsRank" id="rank${id }">
           <option value="-1">1</option>
           <option value="0">2</option>
            <option value="1">3</option>
            <option value="2">4</option>
     </select>
</td>
<td>
       <input name="" type="button" onclick="voteBut(${id})" value="确认" />
 </td>

<script type="text/javascript">

    function voteBut(obj){
        var rank = $("#rank"+obj).val();

    }

</script>