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回复 15# leaparde


    @echo off & setlocal EnableDelayedExpansion
set str=！好你，nc.emohtab.sbb
:loop
set /a n+=1
set /p=!str:~-%n%,1!<nul
if "!str:~%n%!" neq "" goto loop
echo.&pause
     代码中的 set /p=!str:~-%n%,1!<nul
什么意思  和set /p=%str:~-%n%,1%<nul
的区别是什么