[5.1.2.1 新增类别](5.1.2.1%E6%96%B0%E5%A2%9E%E7%B1%BB%E5%88%AB.md) [5.1.2.2 新增五金](5.1.2.2%E6%96%B0%E5%A2%9E%E4%BA%94%E9%87%91.md) [5.1.2.3 修改五金](5.1.2.3%E4%BF%AE%E6%94%B9%E4%BA%94%E9%87%91.md) [5.1.2.4 删除五金](5.1.2.4%E5%88%A0%E9%99%A4%E4%BA%94%E9%87%91.md)