此源码包含一个大类，里面写有诸多方法 能够实现留言板功能，前台留言，后台处理留言，审核留言，删除留言等-This source contains a category, there are many ways to write a message board function can be achieved, front message, background processing messages, audit messages, delete messages, etc.

此源码包含一个大类，里面写有诸多方法 能够实现注册功能。判断用户是否存在，添加用户等功能。-This source contains a category, there are many ways to write to achieve registration function. Determine the user.