@echo off
set i=1
:l
cls
if %i%==1 set /p "=>" <nul
echo a
if %i%==2 set /p "=>" <nul
echo b
if %i%==3 set /p "=>" <nul
echo c

for /f %%i in ('powershell "[int][Console]::ReadKey(1).key"') do (
    if not %%i==13 (
        if %%i==38 if not %i%==1 set /a i-=1
        if %%i==40 if not %i%==3 set /a i+=1
        goto :l
    )
)
echo %i%
pause
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@echo off
setlocal enabledelayedexpansion
for /f %%i in ('echo;prompt $h^|cmd') do set "b=%%i"
for /f "delims=U" %%i in ('cmd/u/c echo;唉') do set "t=%%i"
set "s=  "
for /l %%a in (1,1,62) do set "bs=!bs!!b!"

set c1=选项1
set c2=选项2
set c3=选项3
set c4=选项4
set cn=4
set /a i=cn*1000
set mod=0

:l
if %mod%==0 (echo;[%c1%]) else echo;%c1%%s%
if %mod%==1 (echo;[%c2%]) else echo;%c2%%s%
if %mod%==2 (echo;[%c3%]) else echo;%c3%%s%
if %mod%==3 (echo;[%c4%]) else echo;%c4%%s%

for /f %%i in ('powershell "[Console]::ReadKey(1).key"') do (
    if /i %%i neq enter (
        if /i %%i==uparrow  set /a i-=1
        if /i %%i==downarrow  set /a i+=1
        set/a mod=i%%cn
        2>nul echo;!t!!bs! &set /p=!b!<nul
        goto :l
    )
)
echo %mod%
pause
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