列表页二级分类如何写：

               <div class="item">
                    <span class="tit">一级分类：</span>
                    <div class="mb-sx">{category module=share pid=$parent.id}
                        <a href="{$t.url}" class="btn {if $t.id==$cat.id}on{/if}">{$t.name}</a>{/category}
                    </div>
                </div>
                <div class="item">
                    <span class="tit">二级分类：</span>
                    <div class="mb-sx">{category module=share pid=$parent.id}
                        <a href="{$t.url}" class="btn {if $t.id==$cat.id}on{/if}">{$t.name}</a>{/category}
                    </div>
                </div>