@echo off&setlocal enabledelayedexpansion
for %%a in (*.mp3) do (
    set num=%%a
    for /f "tokens=1,2,3 delims=-." %%b in ("!num!") do (
    ren "%%b-%%c-%%d".mp3 "%%c-%%d".mp3
  )
)
pause
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@echo off&Setlocal enabledelayedexpansion
cd 测试目录
for /f "delims=" %%i in (' dir /b ') do (
    for /f "tokens=1* delims=-" %%a in ("%%i") do (
        set str=%%a
        ::非数值经set /a 后数值变为0，先替换0防止数值因进制问题被设为0
        set /a str=!str:0=1!
        if !str! GTR 0 ren "%%i" "%%b"
    )
)
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