WHY

PowerShell

$SrcDir = 'E:\图片'
$DstDir = 'E:\新图片'
$num = 10
$reg = [regex]::Escape($SrcDir);
dir -Path $SrcDir -Include *.jpg -Recurse | Group { $_.DirectoryName } | %{
        $fd = $_.Name -replace $reg, $DstDir;
        if (![IO.Directory]::Exists($fd)) { [void][IO.Directory]::CreateDirectory($fd) }
        $_.Group | Get-Random -Count $num | Copy -Dest $fd -Force
}
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WHY

@echo off
for /d /r E:\图片 %%i in (*) do (
        setlocal enabledelayedexpansion
        set "fd=%%i"
        set "fd=!fd:E:\图片=E:\新图片!"
        for %%j in ("%%i\*.jpg") do set /a n+=1 & set "_!Random!_!n!=%%j"
        (for /f "tokens=1*delims==" %%j in ( 'set _' ) do (
                set /a m+=1
                if !m! LEQ 10 ( md "!fd!" & copy "%%k" "!fd!\" )
        ))2>nul
        endlocal
)
pause
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