bug fix

models/goods/orders.go

 	ta_goods_orders 
 WHERE 
 	user_id = '` + userId + `' 
-	AND DATE_FORMAT( create_date, '%Y-%m-%d %H:%i:%s' ) <= DATE_FORMAT( date_sub( now( ), INTERVAL 5 SECOND ), '%Y-%m-%d %H:%i:%s' ) 
+	AND DATE_FORMAT( create_date, '%Y-%m-%d %H:%i:%s' ) >= DATE_FORMAT( date_sub( now( ), INTERVAL 5 SECOND ), '%Y-%m-%d %H:%i:%s' ) 
 	AND status = ` + strconv.Itoa(models.STATUS_NORMAL)
 	err := m.db.Sql(sql).Find(&order)
 	return len(order), err

service/goods/orders.go

 		return errors.New("获取5秒钟内是否下单错误")
 	}
 	if num > 0 {
-		return errors.New("您五秒钟内只能下一单。")
+		return errors.New("5 秒内不能频繁下单")
 	}
 
 	// 校验下单内容