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cd.>output.txt
for /f "usebackq delims=" %%i in (`dir /b *.mp3`) do (
        set "var=%%i"
        setlocal enabledelayedexpansion
        set var=!var:~0,2!
        (echo. {)
        (echo. file: "tracks/!var!.mp3",
        (echo. thumb: "thumbs/01.jpg",)
        (echo. trackName: "%%~ni",)
        (echo. trackArtist: "【诗词来了】",)
        (echo. trackAlbum: "凯叔讲故事",)
        (echo. }, )
         ))>>output.txt
        endlocal
)