唯尘

@echo off
for /l %%i in (1,1,20) do (
        md %%i
)
pause

唯尘

@echo off
for /l %%i in (1 1 20) do (@md %%i)
pause>nul
rem  已1为步长创建文件夹

@echo off
:a
set /a n+=1
md %n%
if %n% lss 20 goto a
pause>nul & exit
rem 循环判断自增值 创建文件夹

@echo off
set "str="
for /l %%i in (1 1 20) do call set str=%%str%% %%i
md %str% && pause>nul & exit
rem  步长为1自增至20 连接成长字符串，然后按字符串一次创建20个文件夹