如何在菜单上面加变量？ - Project1

#==============================================================================
# ■ Window_Gold
#------------------------------------------------------------------------------
# 　显示变量的窗口。
#==============================================================================

class Window_Gold2 < Window_Base #  Window_Gold 的 Gold 自定义
  #--------------------------------------------------------------------------
  # ● 初始化窗口
  #--------------------------------------------------------------------------
  def initialize
super(0, 0, 160, 64)
self.contents = Bitmap.new(width - 32, height - 32)
refresh
  end
  #--------------------------------------------------------------------------
  # ● 刷新
  #--------------------------------------------------------------------------
  def refresh
self.contents.clear
cx = contents.text_size($data_system.words.gold).width
self.contents.font.color = normal_color
self.contents.draw_text(4, 0, 120-cx-2, 32, $game_party.gold.to_s, 2)
# $game_party.gold.to_s 可改为 $game_variables[1].to_s（为1号变量）
self.contents.font.color = system_color
self.contents.draw_text(124-cx, 0, cx, 32, $data_system.words.gold, 2)
  end
end

#==============================================================================
# ■ Scene_Menu
#------------------------------------------------------------------------------
# 　处理菜单画面的类。
#==============================================================================

class Scene_Menu
  #--------------------------------------------------------------------------
  # ● 初始化对像
  #    menu_index : 命令光标的初期位置
  #--------------------------------------------------------------------------
  def initialize(menu_index = 0)
@menu_index = menu_index
  end
  #--------------------------------------------------------------------------
  # ● 主处理
  #--------------------------------------------------------------------------
  def main
# 生成命令窗口
s1 = $data_system.words.item
s2 = $data_system.words.skill
s3 = $data_system.words.equip
s4 = "状态"
s5 = "存档"
s6 = "结束游戏"
@command_window = Window_Command.new(160, [s1, s2, s3, s4, s5, s6])
@command_window.index = @menu_index
# 同伴人数为 0 的情况下
if $game_party.actors.size == 0
   # 物品、特技、装备、状态无效化
   @command_window.disable_item(0)
   @command_window.disable_item(1)
   @command_window.disable_item(2)
   @command_window.disable_item(3)
end
# 禁止存档的情况下
if $game_system.save_disabled
   # 存档无效
   @command_window.disable_item(4)
end
# 生成游戏时间窗口
@playtime_window = Window_PlayTime.new
@playtime_window.x = 0
@playtime_window.y = 224
# 生成步数窗口
@steps_window = Window_Steps.new
@steps_window.x = 0
@steps_window.y = 320
# 生成金钱窗口
@gold_window = Window_Gold.new
@gold_window.x = 0
@gold_window.y = 416
# 生成状态窗口
@status_window = Window_MenuStatus.new
@status_window.x = 160
@status_window.y = 0
####################################################################
# 生成状态窗口
@gold2_window = Window_Gold2.new
@gold2_window.x = 160 # 自行设置
@gold2_window .y = 0 # 自行设置
#################################################
# 执行过渡
Graphics.transition
# 主循环
loop do
   # 刷新游戏画面
   Graphics.update
   # 刷新输入信息
   Input.update
   # 刷新画面
   update
   # 如果切换画面就中断循环
   if $scene != self
      break
   end
end
# 准备过渡
Graphics.freeze
# 释放窗口
@command_window.dispose
@playtime_window.dispose
@steps_window.dispose
@gold_window.dispose
@status_window.dispose
####################################################
@gold2_window.dispose
####################################################
  end
#--------------------------------------------------------------------------
  # ● 刷新画面
  #--------------------------------------------------------------------------
  def update
# 刷新窗口
@command_window.update
@playtime_window.update
@steps_window.update
@gold_window.update
@status_window.update
######################################################
@gold2_window.update
########################################################
# 命令窗口被激活的情况下: 调用 update_command
if @command_window.active
   update_command
   return
end
# 状态窗口被激活的情况下: 调用 update_status
if @status_window.active
   update_status
   return
end
  end