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把批处理放到jpg文件所在目录运行即可

@echo off
setlocal enabledelayedexpansion
pushd "%~sdp0"
for %%a in (*.jpg) do (
    set n=%%~na
    set n=!n:~0,-4!
    set m=!n:~0,-4!!n:~-1!
    ren "%%a" "!m!.jpg"
)
pause
exit
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