public void Visit(PermissionInfo contain, PermissionInfo contained)
 {
     int index = pc.Index(contain);
     if (index != -1)
     {
         if (contain.Contains(lp.Left))
             bits[leftmask] = true;//设置左权限
         else if (contain.Contains(lp.Right))
             bits[rightmask] = true;//设置右权限
     }
 }