一个简单的商品销售管理系统,这个源码是我在网上下载来的，只是希望能在这里学习一下，但这里的源码都不让我下载，希望管理员不要笑我-A simple sale of merchandise management system, the source code is downloaded to my only hope to be able to click here to study, but the source did not let me download, I hope the admini