本系统支持系统用户，来宾用户，当输入用户名为： jeny 密码：123 时为系统用户，可以对系统进行

所有操作；输入用户名：guest 无需输入密码时，只能显示数据，不能修改，增删数据等。-The system supports users of the system, the guests users, when to enter a user name: jeny Password: 123 hours for the system user, you can carry out all operations on the system　to enter a user name: guest without a password can only display data, can not be amended, additions and deletions data.