cmd-bat批处理命令延时方法

引用：http://blog.163.com/cb_dt/blog/static/481041420090322011317/?latestBlog

方法一：ping

缺点:时间精度为1秒,不够精确

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@echo off

@ping 127.0.0.1 -n 6 >nul

start gdh.txt

方法二：vbs start /wait

缺点：生成临时文件

有点：时间精度为0.001秒，精度高

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@echo off

echo wscript.sleep 5000>sleep.vbs

start /wait sleep.vbs

start gdh.txt

del /f /s /q sleep.vbs

方法三：vbs cscript

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@echo off

echo wscript.sleep 5000>sleep.vbs

@cscript sleep.vbs >nul

start gdh.txt

del /f /s /q sleep.vbs

方法四：choice

优点：时间精确，CPU占用低，是最佳选择

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@echo off

choice /t 5 /d y /n >nul

start gdh.txt

方法五：for+set+if，时间精度为0.01秒

缺点：CPU占用高，语句过长，不常用

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@echo off

setlocal enableextensions

echo %time%

call :ProcDelay 500

echo %time%

start gdh.txt

:ProcDelay delayMSec_

setlocal enableextensions

for /f "tokens=1-4 delims=:. " %%h in ("%time%") do set start_=%%h%%i%%j%%k

:_procwaitloop

for /f "tokens=1-4 delims=:. " %%h in ("%time%") do set now_=%%h%%i%%j%%k

set /a diff_=%now_%-%start_%

if %diff_% LSS %1 goto _procwaitloop

endlocal & goto :EOF