请问有谁知道三级分类怎么样才能显示，感谢
<div class="location">当前位置：{eyou:position/}</div>
<div class="screen">
<dl class="clearfix">
<dt>栏目：</dt>
<dd>{eyou:models type="top" id="field2" currentstyle="curr" loop='7'}<a href="{$field2.typeurl}" class="{$field2.currentstyle}">{$field2.typename}</a>{/eyou:models}</dd>
</dl>
<dl class="clearfix">
<dt>分类：</dt>
<dd> <a href="{$eyou.field.ptypeurl}" {eyou:gt name="$eyou.field.has_children" value="0"}class="curr"{/eyou:gt}>全部</a>{eyou:models type="first" id="field3" currentstyle="curr"}<a href="{$field3.typeurl}" class="{$field3.currentstyle}">{$field3.typename}</a>{/eyou:models} </dd>
</dl>
{eyou:screening id='field' currentclass='curr' alltxt='全部' addfields='fengge'}
<dl class="clearfix">
{eyou:volist name='$field.list' id='vo'}
<dt>{$vo.title}：</dt>
<dd> {eyou:volist name='$vo.dfvalue' id='val'} <a {$val.on-click} class="{$val.currentclass}" title="{$val.name}" rel="nofollow">{$val.name}</a> {/eyou:volist} </dd>
{/eyou:volist}
{$field.hidden}
</dl>
{/eyou:screening}
{eyou:screening id='field' currentclass='curr' alltxt='全部' addfields='yanse'}
<dl class="clearfix">
{eyou:volist name='$field.list' id='vo'}
<dt>{$vo.title}：</dt>
<dd class="color"> {eyou:volist name='$vo.dfvalue' id='val'} <a {$val.on-click} class="{$val.currentclass}" title="{$val.name}" rel="nofollow"><span class="color{$key}">{$val.name}</span></a> {/eyou:volist} </dd>
{/eyou:volist}
{$field.hidden}
</dl>
{/eyou:screening} </div>