管理权限
管理权限的模块怎么实现，在数据库里设置一个管理权限的字段默认为2，管理员的想设为1，怎么设置管理员，怎么判断登陆的是管理员啊，管理员也可以修改用户名跟密码吗？
------解决方案--------------------
修改应该是可以的，首先登陆的时候可以把管理员的session设置为默认的，然后在判断可行不？
------解决方案--------------------
可以设置默认值。 判断的话。提交后判断一下就行了啊。
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