判断字符个数

>tmp.txt echo password
for /f
"tokens=3 delims= " %%i in ('dir /x tmp.txt ^|find "1 个文件"') do set/a
num=%%i-2
del/q tmp.txt

PS:（生成临时文件，汉字占2个字符）

@echo off
setlocal enabledelayedexpansion
set/p
a=输入：
:count
set/a num=num+1
if not "!a:~%num%,1!"=="" goto
:count
echo 输入的字符%a%,长度为%num%
pause>nul