发一个开场毕场的效果...

::打开程序
for /l %%i in (14,1,45) do mode con cols=%%i lines=1
for /l %%j in (1,1,20) do mode con cols=45 lines=%%j
::退出程序
for /l %%j in (20,-1,1) do mode con cols=45 lines=%%j
for /l %%i in (45,-1,14) do mode con cols=%%i lines=1