itemid,ID,
title,优惠名称,
username,会员名,
addtime,添加时间,
fromtime,开始时间,
totime,过期时间,
price,优惠额度,
cost,最低消费,
amount,数量限制,
number,已领人数,
open,是否开放,
editor,编辑,
edittime,修改时间,
note,备注,