a@echo %dbg% off
setlocal ENABLEDELAYEDEXPANSION
mode con cols=80 lines=30
cls

set 退格=
set redtek="                                                                                "

set end=0

:start

       set /a end+=1

       call :calc

       set /p=!setspaces! <nul&ping /n 1 127.1>nul

       set /p=%退格%<nul

       set /p=%redtek:~1,79%<nul&echo.

       goto :start

:calc

       if %end%==28 (

            set /a end=0 & cls & set /a cols=!random:~0,2!

            echo ...   风力：!cols! ...      

            if !cols! GTR 76   set cols=76

            if !cols! LSS 2       set cols=2

            set setspaces=!redtek:~1,%cols%!!random:~0,1!

            goto :eof

       )

@echo off

mode con cols=80
color 02
for /f %%i in (test.txt) do set str_char=%%i
set str_blank=                                                                              
setlocal enabledelayedexpansion

:loop
:: 取随机位置上的字符
set /a num_char=1%random:~-1%%random:~0,1%-100
set char=!str_char:~-%num_char%,1!

:: 设置随机长度的空格
set /a num_blank=1%random:~-1%%random:~0,1%-100
set blank=!str_blank:~0,%num_blank%!
echo.%blank%%char%
goto loop

@echo off

mode con cols=80
set a=1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~`!@#%.*(){}[]_+-=\"\'?.,/^&^^^>^<
set b=                                                                              
setlocal enabledelayedexpansion
:a
set /a num=%random%%%92
set 字符=!a:~-%num%,1!
set/a c=%random%%%80
set 空格=!b:~-%c%!
echo %空格%^%字符%
goto a


@echo off

mode con cols=80 LINES=30
set a=1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ~`!@#%.*(){}[]_+-=\"\'?.,/^&^^^>^<
set b=                                                                              
setlocal enabledelayedexpansion
:a
set /a num=%random%%%92
set 字符=!a:~-%num%,1!
set/a c=%random%%%80
set 空格=!b:~-%c%!
::echo. %空格%^%字符%

set/a i+=1
rem 指针=i 尾指针=j
set/a j=i-30
set line%i%=%空格%^%字符%
FOR /L %%v IN (%i%,-1,%j%) DO echo.!line%%v!
::ping /n 127.1>nul
goto a

@echo off

::mode con cols=80
setlocal ENABLEDELAYEDEXPANSION
color 02

goto BEGIN
goto :eof

::function mt_rand "a" "b"
:mt_rand
::(
set a=%~1
set b=%~2
set /a _mt_rand=(!random!%%(%b%-%a%))+%a%
exit /b 0
::)

:BEGIN
::{--
SET iWidth=80
SET iDensity=6
   SET sText="#$&\'()*+,-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
   SET sText=!sText:"=!
set /A iText=90-1

for /l %%i in (1,1,%iWidth%) do (
set aDown%%i=0
)

:loop
for /l %%I in (1,1,%iWidth%) do (
       set /a aDown%%I-=1
       if !aDown%%I! LSS 0 (
         call :mt_rand "0" "%iDensity%"&&set aArrow%%I=!_mt_rand!
         call :mt_rand "10" "25"&&set aDown%%I=!_mt_rand!
       )
       if !aArrow%%I! EQU 1 (
         call :mt_rand "0" "%iText%"&&(FOR %%M IN ("!_mt_rand!") DO SET aa=!sText:~%%~M,1!)
         set /p=!aa!<nul
       ) else (
         set /p= <nul
       )
)
goto loop
::--}

:exit
exit /b 0

@echo off

setlocal ENABLEDELAYEDEXPANSION
color 02

for /l %%i in (1,1,80) do (
       set Down%%i=0
)

:loop
       for /l %%j in (1,1,80) do (
            set /a Down%%j-=1
            if !down%%j! LSS 0 (
                     set /a Arrow%%j=!random!%%4
                     set /a Down%%j=!random!%%15+10
            )
            if "!Arrow%%j!" == "1" (
                     set /a chr=!random!%%2
                     set /p=!chr!<nul
            ) else (
                     set /p= <nul
            )
       )
goto loop
goto :eof

@echo off

setlocal ENABLEDELAYEDEXPANSION
for /l %%i in (1,1,80) do (
       set Down%%i=0
)

for /l %%i in (0) do (
set line=
       for /l %%j in (1,1,80) do (
            set /a Down%%j-=1
            call set x=!down%%j!
            if !x! LSS 0 (
                     set /a Arrow%%j=!random!%%6
                     set /a Down%%j=!random!%%15+10
            )
            call set x=!Arrow%%j!
            if "!x!" == "1" (
                     set line=!line!1
            ) else (set "line=!line! ")
       )
       call set /p=!line!<nul
)[/code]