ping 40台主机只需5秒钟

@echo off&setlocal enabledelayedexpansion
if "%1" equ "" (set/a n=-9,m=0&echo %time%) else echo %1 %time%
for /l %%a in (1 1 4) do if "%1" equ "%%a" goto p1
for /l %%a in (1 1 4) do (
        set /a n+=10
        set/a m+=10
        start/b %~s0 %%a !n! !m!
)
exit
:p1
for /l %%i in (%2 1 %3) do (
        title 192.168.18.%%i
        ping /n 1 /w 1 192.168.18.%%i >nul 2>nul&&echo 192.168.18.%%i
)
echo %1 %time%
for /l %%a in (1 1 3) do if "%1" equ "%%a" exit
rem 加if "%1" equ "%%a"判断，否则 (%终止量%-1)*(%终止量%)=n  退出n次。。。
pause>nul&exit