@璐村惂鐢ㄦ埛_000076K馃惥 on
set t=1
echo 请输入格式，del为删除
set /p gs=
if "%gs%"=="del" (goto del)
set /p p1=photo one
set /p p2=photo two
set /p long=times
if exist %p1% (if exist %p2% (
for /l %%i in (1,1,%long%) do (
if %t% EQU 1 (copy %p1% %%i.%gs%
set t=2
) else (copy %p2% %%i.%gs%
set t=1)
)
pause
exit) else (echo unfind photo two
pause)
) else (echo unfind photo one
pause)
exit
:del
if exist %t%.* (del %t%.*
set /a t=%t%+1
goto del)
exit

为什么我的变量t的值没有变化

自己解决了，突然想起还有延缓环境变量

改后源码
@璐村惂鐢ㄦ埛_000076K馃惥 off
set t=1
echo 请输入格式，del为删除
set /p gs=
if "%gs%"=="del" (goto del)
set /p p1=photo one
set /p p2=photo two
set /p long=times
setlocal ENABLEDELAYEDEXPANSION
if exist !p1! (if exist !p2! (
for /l %%i in (1,1,!long!) do (
if !t! EQU 1 (copy !p1! %%i.!gs!
set t=2
) else (copy !p2! %%i.!gs!
set t=1)
)
pause
exit) else (echo unfind photo two)
) else (echo unfind photo one)
pause
endloacl
exit
:del
if exist %t%.* (del %t%.*
set /a t=%t%+1
goto del)
exit

很好的debug例子