该系统主要处理通讯录的相关信息。通讯录信息重要包括：姓名、班级、手机、家庭电话、电子邮件、通讯录地址、邮编等内容，实现通讯录的添加、修改、删除和查询。(This system mainly deals with the information of address book. Address book information is important, including: name, class, mobile phone, home phone, e-mail, address book,