//分页
	if req.Offset < 0 || req.Limit < 0 {
		return &response.TagItemListResp{
			TagList: make([]*response.TagListItemResp, 0),
			Total:   total,
		}, nil
	}
	if req.Limit == 0 {
		req.Limit = 20
	}
	if req.Offset+req.Limit <= int64(len(tagsCurrent)) {
		tagsCurrent = tagsCurrent[req.Offset : req.Offset+req.Limit]
	} else if req.Offset < int64(len(tagsCurrent)) {
		tagsCurrent = tagsCurrent[req.Offset:int64(len(tagsCurrent))]
	} else {
		tagsCurrent = make([]*response.TagListItemResp, 0)
	}