用户管理系统：用户注册、用户登录、用户管理、用户日志管理.本项目主体是学生，他们有以下信息，系统有三种用户角色：校领导，普通教师，学生 -User management system: user registration, user login, user management, user log management The project main students, they have the following information, the system has three user