管理库存的物品，由几个品牌构成了一个品牌，每个品牌有代码、颜色、数量等信息；再在原有基础上进货和增加品牌，也就是修改结点的数据部分；最后就是商品的出库。-Managing inventory items by several brands constitute a brand, each brand has a code, color, quantity, etc.　then based on the original purchase and increase brand, which is part modify data node　Last is a commodity libraries.