@echo off
set FolderA=A
set FolderB=B
set FolderC=C
set /a a=2, b=3
set /p a=从%FolderA%中取出多少个文件：
set /p b=从%FolderB%中取出多少个文件：
echo 从%FolderA%中取出%a%个，从%FolderB%中取出%b%个
pause
setlocal enableDelayedExpansion
set n=0
for %%a in ("%FolderA%\*") do set "a_!random!_!n!=%%a"&set /a n+=1
set n=0
for %%a in ("%FolderB%\*") do set "b_!random!_!n!=%%a"&set /a n+=1
set n=0
for /f "tokens=1* delims==" %%a in ('set a_') do (
    if !n! geq %a% goto done1
    copy "%%b" "%FolderC%"
    set /a n+=1
)
:done1
set n=0
for /f "tokens=1* delims==" %%a in ('set b_') do (
    if !n! geq %b% goto done2
    copy "%%b" "%FolderC%"
    set /a n+=1
)
:done2
echo;&echo 完成.&echo;
pause
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