一个移动 OA 应用，包含注册、登录、用户信息等基本功能，集成了 OA 中使用场景较多的报销、请假、部门管理、成本中心等核心功能。(A mobile OA application, including registration, login, user information and other basic functions, integrated OA use scenes more reimbursement, leave, department management, cost cent