本源码，主要实现用户登录功能。在用户输入用户名密码，提交以后，就将用户名及密码与服务器数据库中的数据进行比较，一致即可登录，不一致即重登-The source, mainly to implement user login. In a user name password, submitted, will be the user name and password with the server to compare data in the database, the same can log