WHY

@echo off
setlocal enabledelayedexpansion
set /p SN=请输入初始字符串（大于6个字符，后6位必须为数字）:
set /p NUM=请输入生成数量：
set /p SEQ=请选择正反序（输入+为正序，输入-为反序）:
set "var=%SN:~0,-6%"
set /a n1 = 1%SN:~-6%, n2 = n1 %SEQ% ( NUM - 1 )
for /L %%i in (%n1%,%SEQ%1,%n2%) do (
    set "s=%%i"
    echo;%var%!s:~-6!
)
pause
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