本章实现了电子通讯录系统，功能包括用户注册、用户登录、修改密码、添加好友、添加好友联系方式、修改好友联系方式、删除好友联系方式等-This chapter to achieve an electronic address book system, features include user registration, user login, modify your password, add a friend, add a friend Contact us, modification Frie