@echo off
if not "%1"=="" call %*
del "%temp%\#" 2>nul
start /b %~fs0 :aa
echo.&echo      1.打开c盘           2.打开d盘
echo.&set/p var=请输入:
if exist "%temp%\#" (del "%temp%\#"&exit)
>"%temp%\#" type nul&ping -n 2 127.1>nul
goto :%var%
:1
start c:\&exit
:2
start d:\&exit
:aa
for /l %%a in (10 -1 0) do (
   title 倒计时 %%a 秒,无选择将打开 c 盘...
   if exist "%temp%\#" (
      del "%temp%\#"
      title 用户已作选择...
      exit
   )
   ping -n 2 127.1>nul
)
>"%temp%\#" type nul&start c:\&title 回车退出...&exit