@echo off
md a b
for /l %%l in (1,1,30000) do (
	cd.>a\%%l.x
	cd.>b\%%l.x
)
pause
echo %time%
del /s /q /f a\*.x 1>nul 2>nul
echo %time%
pause
echo %time%
rd /s /q b
echo %time%
pause
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@echo off

setlocal
set /p num=测试用文件数：
echo 正在创建测试用的文件
set start=%time%
md a b

for /l %%l in (1,1,%num%) do (

	cd.>a\%%l.x

	cd.>b\%%l.x

)

call :timer
echo 正在用del /s/q/f命令删除文件
set start=%time%
del /s /q /f a\*.x 1>nul 2>nul

call :timer
echo 正在用rd /s/q命令删除文件
set start=%time%
rd /s /q b

call :timer
pause
rd a >nul

:timer
set end=%time%
set options="tokens=1-4 delims=:.,"
for /f %options% %%a in ("%start%") do set start_h=%%a&set /a start_m=100%%b %% 100&set /a 

start_s=100%%c %% 100&set /a start_ms=100%%d %% 100
for /f %options% %%a in ("%end%") do set end_h=%%a&set /a end_m=100%%b %% 100&set /a 

end_s=100%%c %% 100&set /a end_ms=100%%d %% 100
set /a hours=%end_h%-%start_h%
set /a mins=%end_m%-%start_m%
set /a secs=%end_s%-%start_s%
set /a ms=%end_ms%-%start_ms%
if %ms% lss 0 set /a secs = %secs% - 1 & set /a ms = 100%ms%
if %secs% lss 0 set /a mins = %mins% - 1 & set /a secs = 60%secs%
if %mins% lss 0 set /a hours = %hours% - 1 & set /a mins = 60%mins%
if %hours% lss 0 set /a hours = 24%hours%
if 1%ms% lss 100 set ms=0%ms%
set /a totalsecs = %hours%*3600 + %mins%*60 + %secs%
echo 耗时：%hours%:%mins%:%secs%.%ms% (%totalsecs%.%ms%秒)
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