中国DOS联盟

@echo off&mode con cols=30 lines=5

echo.&echo.

:begin

set str=www.cn-dos.net&set b=123456789abcdef

set /a a=%random%%%14

call,color 1%%b:~%a%,1%%

call,set var=%%str:~%a%,1%%

call,set str=%%str:%var%= %%

set /p=       %str%<nul

for /l %%i in (1,1,100) do set /p=<nul

goto begin