各级菜单一个变量,比如FTHER(FTHER=0为工作界面),子菜单一个变量SON,孙菜单一个变量SUN,通过进入每级菜单的一个按键 o来计数 （单片机）-A variable at all levels of the menu, such as FTHER (FTHER = 0 as the working interface), a variable sub-menu SON, Sun menu a variable SUN, by entering a key for each m