复制代码 代码如下:

::code by lxmxn @ cn-dos.net .

::目的：帮助新手们更好的理解变量字符截取功能.

::Date 2006-12-16 .

::说明：有的变量截取之后值为空，这是正常的.

::

@echo off&setlocal EnableDelayedexpansion

::设置变量var的值：

set var=0123456789ABCDEF

call :begin

for /l %%a in (1,3,15) do (

for /l %%b in (1,4,15) do (

call :printf %%a %%b

)

)

call :begin

for /l %%a in (1,4,15) do (

for /l %%b in (-1,-3,-15) do (

call :printf %%a %%b

)

)

call :begin

for /l %%a in (-2,-3,-15) do (

for /l %%b in (1,4,15) do (

call :printf %%a %%b

)

)

call :begin

for /l %%a in (-1,-4,-15) do (

for /l %%b in (-2,-3,-15) do (

call :printf %%a %%b

)

)

pause

endlocal&cls&echo.

echo 演示结束了，任意键退出……

pause>nul

goto :eof

::输出结果：

:printf

echo %%var:~%1,%2%% 截取之后的字符为: !var:~%1,%2!

goto :eof

::清理屏幕：

:begin

echo&pause&cls&echo.

echo 变量var的值为: %var%

echo.

goto :eof