@echo off&setlocal enabledelayedexpansion
for %%a in (a b c d e f g h i j k l m n o p q r s t u v w x y z)do (
set/a .+=1&call set %%a=%%.%%)
::试改变以下表达式5和e运行看看！
set/a a=%e%+5
for %%b in (a b c d e f g h i j k l m n o p q r s t u v w x y z)do (
set/a ..+=1&if !a!==!..! set a=%%b)
echo %a%
pause 
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@echo off
:bgn
set /p str=字符串: 
for /f "skip=1 delims=:" %%a in ('^(echo.%str%^&echo.^)^|findstr /o .') do (
  set /a Bytes=%%a-3
)
echo 字节数: %Bytes%
echo. & goto bgn
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