Batcher

不要使用中文输入法的双引号，试试这样可以吗：

@echo off
set "a=礼券兑换"
set "b=xlsx"
set "name=%a%%date:~5,2%%date:~8,2%"
:11
set /a n+=1
if not exist bak\"%name%-%n%.%b%" (
  copy /y %a%.xls bak\"%name%-%n%.%b%"
) else goto :11