thinkphp下批量修改某個字段

<form action="" method="post" id="formtable">

 <div class="opera-td" >
        <a href="javascript:;" class="button audit" posturl="<{:U('audit')}>">審覈</a>
        <a href="javascript:;" class="redbtn delbtn" posturl="<{:U('del')}>">刪除</a>
      </div>

<volist name="content" id="list">

<input type="checkbox" name="id[]" value="<{$list['id']}>">

<a href="<{$list['iframe_url']}>" target="_blank"><{$list['iframe_url']}></a>

 </volist>

</form>

<script>

$(function(){
$(':checkbox:eq(0)').click(function(){
var c = $(this).attr('checked') ? true : false;
$(':checkbox').attr('checked',c);
});


$('.opera-td a').click(function(){
var operadelcheck = /delbtn/,operaauditcheck = /audit/,cl = $(this).attr('class'),formurl = $(this).attr('posturl');
var checked = function(){
if($(":checked[name='id[]']").val() != undefined){
$('#formtable').attr('action',formurl);
$('#formtable').submit();
}else{
layer.msg('你未選擇項目', {time: 1000});
}
};
if(operadelcheck.test(cl)){
layer.confirm('確定要刪除嗎？',function(){checked();});
}else if(operaauditcheck.test(cl)){
layer.confirm('確定要通過審覈嗎？',function(){checked();});
}else{
$('#formtable').attr('action',formurl);
$('#formtable').attr('target','_blank');
$('#formtable').submit();
}
});
});

</script>