007你给我进来，Come in,please!
http://blog.csdn.net/ljc007/archive/2010/04/17/5496729.aspx

::Question:
::ＬＪＣ /* 
::这样怎么扩充变量　%%B
  
setlocal enabledelayedexpansion
  FOR /F "usebackq tokens=* delims=" %%i in (`dir /ad /b`) do (
  set b=%%~ti%
  echo !a! 
  echo !b! 
  if !a! leq %%b:~0,-6%% echo %%b:~0,-6%% 
  set a=%%b:~0,-6%%
)
 pause

:: */

------解决方案--------------------

探讨

::这样怎么扩充变量　%%B