pcl_test

@echo off & setlocal enabledelayedexpansion
set /p t=输入倒计时所需的时分秒（h:m:s）
for /f "tokens=1-3 delims=:" %%a in ("%t%") do set "a=%%a" & set "b=%%b" & set "c=%%c"
if %a:~,1% equ 0 if "%a:~1,1%" neq "" set "a=%a:~1%"
if %b:~,1% equ 0 if "%b:~1,1%" neq "" set "b=%b:~1%"
if %c:~,1% equ 0 if "%c:~1,1%" neq "" set "c=%c:~1%"
set /a t=%a%*3600+%b%*60+%c%
for /l %%i in (%t%,-1,1) do (
cls
set /a h=t/3600
set /a m=t%%3600/60
set /a s=t%%60
set h=00!h!
set m=00!m!
set s=00!s!
echo 倒计时[!h:~-2!:!m:~-2!:!s:~-2!]
set /a t-=1
ping 0 -n 2 >nul
)
exit
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