本系统的设计模式模拟是书店的图书销售情况，经过充分地系统调研，发现本系统应包括图书信息，客户，营销信息，销售统计信息，退货信息。除此之外应该还包括操作员信息-The system design model simulations of the books in bookstores sales, after full system research and found that the system should include the book information, customers,