77七

@echo off
set str=" "
setlocal enabledelayedexpansion
if "!str:~-1!" equ " " (
	set "str=!str:~0,-1!"
)
endlocal & set "str=%str%"
rem echo [%str%]
pause
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提示：如此赋值变量，此时 str的值包括双引号