@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%a in (a.txt) do set /a l=n,n+=1&set ".!n!=%%a"
(for /l %%a in (1,1,%n%) do (
  set str=
  for /l %%b in (1,1,%l%) do (
    set /a r=!random!%%n+1
    for %%c in (!r!) do set "str=!str!!.%%c!_"
  )
  echo !str:~,-1!
))>b.txt
start b.txt
复制代码