请问易优CMS判断后台输出栏目图片-模板代码使用说明

{eyou:assign name='toplitpic' value='$eyou.field.typeid|gettoptype=###,"litpic"'}  {eyou:empty name='$toplitpic'}    <img src="{eyou:global name='web_templets_pc' /}/skin/img/banner.jpg"  height="134" border=0 >  {eyou:else /}    <img src="{$eyou.field.typeid|gettoptype=###,'litpic'}"  height="134" border=0 > {/eyou:empty}

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