@echo off
for /l %%i in (1,1,3) do (
    set str=%%i
    setlocal enabledelayedexpansion
    set str=0!str!
    call :o
    endlocal
)
echo,####%str%
pause
:o
echo,%str%
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@echo off
setlocal enabledelayedexpansion
for /f "useback delims=" %%a in ("%~f0") do (
	set /a _n+=1
	set _!_n!=%%a
)
for /f "delims=" %%a in ('set _') do (
	if not defined _end (
		endlocal
		set _end=1
	)
	set %%a
)
set _end=
set _
pause
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@echo off &setlocal
echo,第一轮
set/a "v1=1,v2=2,v3=3"
echo,	未开延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
setlocal enabledelayedexpansion
set "v1=11" &set "v2=12" &set "v3=13"
echo,	开启延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
endlocal
echo,	关闭延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
echo,第二轮（续命之道）
set/a "v1=1,v2=2,v3=3"
echo,	未开延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
setlocal enabledelayedexpansion
set "v1=21" &set "v2=22" &set "v3=23"
echo,	开启延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
endlocal & set "v1=%v1%" &set "v2=%v2%" &set "v3=%v3%"
echo,	关闭延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
echo,第三轮（复合语块-if）
set/a "v1=1,v2=2,v3=3"
echo,	未开延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
if 1 equ 1 (
	setlocal enabledelayedexpansion
	set "v1=31" &set "v2=32" &set "v3=33"
	echo,	开启延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
	endlocal & set "v1=%v1%" &set "v2=%v2%" &set "v3=%v3%"
)
echo,	关闭延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
echo,第四轮（复合语块-for）
set/a "v1=1,v2=2,v3=3"
echo,	未开延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
for /l %%n in (1,1,1) do (
	setlocal enabledelayedexpansion
	set "v1=41" &set "v2=42" &set "v3=43"
	echo,	开启延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
	endlocal & set "v1=%v1%" &set "v2=%v2%" &set "v3=%v3%"
)
echo,	关闭延迟变量》v1=%v1%,v2=%v2%,v3=%v3%
endlocal&pause&exit/b
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setlocal
set n=1
endlocal & echo %n%
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set n=1& echo %n%
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set n=1& setlocal enabledelayedexpansion &echo %%n%%=[%n%](预处理=空值)  ^^!n^^!=[!n!](变量延迟扩展值)&endlocal & echo set "n=%n%"
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@echo off
SetLocal EnableDelayedExpansion
set /a var1=1,var2=2,var3=3
echo.已启用延缓环境变量
echo.var1 = !var1!, var2 = !var2!, var3 = !var3!

%================================================================%
%= 设定要复制的变量名列表 =%
set "__varlist=var1 var2 var3"
set "__command="

for %%_ in (!__varlist!) do (
    set "__command=!__command! "%%_=%%%%_%%""
)

for /f "delims=" %%_ in ('echo.!__command!') do (
    echo.{%%_}
    endlocal
    for %%` in (%%_) do (
        set %%`
    )
)
%================================================================%

set __varlist
set __command

echo.已禁用延缓环境变量
echo.var1 = %var1%, var2 = %var2%, var3 = %var3%
%= 下面一行没有任何意义，只是想说明已禁用延缓环境变量 =%
echo.var1 = !var1!, var2 = !var2!, var3 = !var3!

pause
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set _inlocal_=True
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@echo off
setlocal 

set _var1_=111
call b.bat

echo :1
set _

for /f "usebackq tokens=1,* delims==" %%a in (`set __`) do (
	set _b%%a=%%b
	set %%a=
)

echo :2
set _

endlocal

pause
exit/b
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@echo off
setlocal enableDelayedExpansion

set __var1__=value1
set __var2__=value2
set __var3__=value3

for /f "delims=" %%a in ('set __') do (
	if defined _inLocal_ (endlocal)
	set %%a
)

exit/b
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