生成随机文件的bat代码求解释

邹哥来了

请各位batchers解释一下这段代码的意思：

1. @echo off&setlocal enabledelayedexpansion
   
2. set "str=abcdefghijklmnopqrstuvwxyz0123456789"
   
3. set "code=jpg txt bat exe wma mp3"
   
4. md test&cd test
   
5. for /l %%a in (1,1,20) do (
   
6.     for /l %%b in (1,1,9) do (
   
7.           set /a a=!random!%%36
   
8.           call,set "var=!var!%%str:~!a!,1%%"
   
9.      )
   
10.     set /a b=!random!%%5+1&call :lp
    
11.     set "var="
    
12. )
    
13. goto :eof
    
14. :lp
    
15. for /f "tokens=%b%" %%c in ("%code%") do echo.>!var!.%%c

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本人新手，初入论坛，在此不胜感谢

flashercs

1. @echo off&setlocal enabledelayedexpansion
   
2. set "str=abcdefghijklmnopqrstuvwxyz0123456789"
   
3. set "code=jpg txt bat exe wma mp3"
   
4. md test&cd test
   
5. for /l %%a in (1,1,20) do ( REM 20次
   
6.     for /l %%b in (1,1,9) do ( REM 生成9位随机文件名
   
7.           set /a a=!random!%%36
   
8.           call,set "var=!var!%%str:~!a!,1%%"
   
9.      )
   
10.     set /a b=!random!%%6+1&call :lp REM 随机后缀名
    
11.     set "var="
    
12. )
    
13. goto :eof
    
14. :lp REM 生成空白随机文件
    
15. for /f "tokens=%b%" %%c in ("%code%") do echo.>!var!.%%c

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