522235677

@echo off
set /p a=输入IP 192.168.1.
set n=0
:loop
ping 192.168.1.%a% -w 20 -n 1 >nul
if errorlevel 1 (set /a n+=1) else (set n=0)
if %n%==20 echo youwenti&pause
goto loop
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大概写了下  没测试