如何更改对话框透明度？ - Project1

#--------------------------------------------------------------------------
  # ● 设置窗口位置与不透明度
  #--------------------------------------------------------------------------
  def reset_window
if $game_temp.in_battle
   self.y = 16
else
   case $game_system.message_position
   when 0  # 上
      self.y = 16
   when 1  # 中
      self.y = 160
   when 2  # 下
      self.y = 304
   end
end
if $game_system.message_frame == 0
   self.opacity = 255
else
   self.opacity = 0
end
self.back_opacity = 160
  end