织梦dede如何让channelartlist标签支持currentstyle属性

$pv->Fields['typeurl'] = GetOneTypeUrlA($typeids[$i]);

if($typeids[$i]['id'] == $refObj->TypeLink->TypeInfos['id'] || $typeids[$i]['id'] == $refObj->TypeLink->TypeInfos['topid'] ){
            $pv->Fields['currentstyle'] = $currentstyle ? $currentstyle : 'current';
        }
        else{
            $pv->Fields['currentstyle'] = '';
        }

{dede:channelartlist typeid='2' currentstyle='current'}
<li class='{dede:field.currentstyle/}'><a href='{dede:field name='typeurl'/}'>{dede:field name='typename'/}</a></li>
{/dede:channelartlist}