模拟了大学图书馆的基本业务流程，分为学生端和管理端，实现了登录，注册，改密，借书，还书，挂失，罚款等功能，总的来说很完整。-Simulation of the University Library' s basic business processes, students are divided into client-side and management to achieve the login, registration, change the password, library,