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测试之前请做好备份

@echo off
for /f "tokens=1,*" %%i in ('dir /b /ad') do (
    call :ProcFold "%%i" "%%j"
)
goto :eof

:ProcFold
for /f "delims=" %%u in ('dir /b /a-d "%~1 %~2\*.jpg"') do (
    ren "%~1 %~2\%%u" "%~1%%~xu"
    goto :eof
)
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