帝国CMS灵动标签排序写法
栏目排序：
order by `classid` desc
按栏目ID降序
order by `classid` asc
按栏目ID升序
order by myorder desc
按栏目自定义排序 order by myorder asc 按栏目自定义降序
栏目排序：
order by `classid` desc
按栏目ID降序
order by `classid` asc
按栏目ID升序
order by myorder desc
按栏目自定义排序 order by myorder asc 按栏目自定义降序
