相关栏目-下级或者同级栏目 为何效果出不来呢？

    <ul>
                         {loop $related $c}                                                
                            <li class="{if $c.id==$cat.id} class=" active"{/if}"><a title="{$c.name}" href="{$c.url}">{$c.name}</a></li>
                         {/loop}
                    </ul>

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