开发此系统能更方便供用户一个简单而快捷的方式来管理自己的联系人信息，并能实时方便快捷地添加、查询、删除用户的联系人信息。-The development of this system is more convenient for a simple and fast way for users to manage their own contact information, and real-time to quickly and easily add, query, delete the use