全部分类
{foreach $category_list as $category_one_item}
{$category_one_item.title}
{notempty name="category_one_item.children"} {foreach $category_one_item.children as $category_two_item}
{$category_two_item.title}
{notempty name="category_two_item.children"} {foreach $category_two_item.children as $category_three_item}
{$category_three_item.title}
{/foreach} {/notempty}
{/foreach} {/notempty}
{/foreach}