整个系统还不够完善，应该在加一些账号注销的代码。关于这次的程序，也有挺多不足的地方。实现用户注册、登录、买票、退票、注销、退出系统功能。-The whole system is not perfect enough, should add some code account cancellation.Inadequate about this program, there are a lot of places.Realize the user register, login, buy a ti