实现了使用人员的注册和登录功能，可以实现图书的增加和删除，可以实现在超过还书时间会有记录，还可以查询借书人、借出的书，还可以实现预约图书功能-The use of personnel to achieve registration and login function, you can achieve an increase in books and delete can be achieved over time there will be record book, people can also query library, lending books, but also the realization of an appointment book features