zcydez

@echo off
set a=0 & set b=1 & c=%a% & d= %b%
:b
if %a% neq 20 goto a
if %a% equ 20 exit
:a
md %b% & set /a a=%c%+1 & set /a b=%d%+1 & set c=%a% & set d=%b%
goto b

zcydez

setlocal EnableDelayedExpansion
for /l %%i in (20 -1 1) do (set wjj=!wjj! %%i)
md %wjj%
::还有一种
set ci=1
:a
md %ci%
if %ci%==20 exit
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