[文件操作] BAT两个for循环嵌套，两个变量值为什么会重复？

echo on
setlocal enabledelayedexpansion
for /f "delims=U" %%a in ('cmd /u/c echo 唉') do set "tab=%%a"
if exist a.txt del a.txt
if exist b.bat del b.bat
cd /d "E:\测试照片批量重命名\0"
dir /b/od>"E:\测试照片批量重命名\a.txt"
for /f "skip=6 tokens=2 delims=%tab%" %%i in ('type "E:\测试照片批量重命名\3.txt"') do (
for /f "tokens=1 delims=" %%b in (E:\测试照片批量重命名\a.txt) do echo ren "%%b" "%%i.jpg">>"E:\测试照片批量重命名\b.bat")
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echo on
setlocal enabledelayedexpansion
for /f "delims=U" %%a in ('cmd /u/c echo 唉') do set "tab=%%a"
  if exist a.txt del a.txt
  if exist b.bat del b.bat
pause
  cd /d "E:\测试照片批量重命名\0"
  dir /b/od>"E:\测试照片批量重命名\a.txt"
  for /f "tokens=1 delims=" %%b in (E:\测试照片批量重命名\a.txt) do (
  for /f "skip=6 tokens=2 delims=%tab%" %%i in ('type "E:\测试照片批量重命名\3.txt"') do echo ren "%%b" "%%i.jpg">>"E:\测试照片批量重命名\b.bat")
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@echo on
setlocal enabledelayedexpansion
for /f "delims=U" %%a in ('cmd /u/c echo 唉') do set "tab=%%a"
if exist a.txt del a.txt
if exist b.bat del b.bat
pause
cd /d "E:\测试照片批量重命名\0"
dir /b/od>"E:\测试照片批量重命名\a.txt"
for /f "skip=6 tokens=2 delims=%tab%" %%i in ('type "E:\测试照片批量重命名\3.txt"') do (
set /a n+=1
for /f "tokens=1 delims=" %%b in (E:\测试照片批量重命名\a.txt) do echo %%b>>"E:\测试照片批量重命名\b.bat")
set /a m+=1
if /i "!n!"=="!m!" echo ren "%%b" "%%i.jpg">>"E:\测试照片批量重命名\b.bat")
set m=0)
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@echo on&setlocal enabledelayedexpansion
if exist b.bat del b.bat 
for /f "delims=U" %%a in ('cmd /u /c echo 唉') do set "tab=%%a"
cd /d "E:\测试照片批量重命名\0"
(for /f "delims=" %%a in ('echo ##^&echo ##^&dir /b/od *.jpg') do (
     set/p fn=
     if not "%%a"=="##" (  
       for /f "tokens=2 delims=%tab%" %%b in ("!fn!") do echo ren "%%a" "%%b.jpg">>"E:\测试照片批量重命名\b.bat"
     )          
))<"E:\测试照片批量重命名\3.txt"
pause
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