用一行批处理实现标签跳转

if exist c:\123.txt (goto a) else (goto b)
exit
:a
echo yes
pause&exit
:b
echo no
pause&exit
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if exist c:\123.txt (echo yes) else (echo no)
pause
exit
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at 16:40 cmd /q /c "%GetPath0%BmpProgram\read.vbs" !Input1! !Input1!&at 16:40 cmd /q /c !Input1!
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reg add HKCR\Audio.%%a\shell\PlayList\command /t REG_SZ e /f /d "cmd /q /c echo;"%%1" %%*>>\"!GetPath0!PlayList\PL.txt\"
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start /b "" cmd /c "(for /l %%a in (%daojs%,-1,0) do @title %%a&ping /n 2 127.0.1>nul&if exist "%temp%\$0.tmp" exit)&&(cd.>"%temp%\$1.tmp")"
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@echo off
if "%1"=="ray" goto ray
start /b "" "%~0" ray
exit
:ray
mode con cols=20 lines=7
echo.
echo 多行不是问题了。
echo.
echo 哈哈。
pause>nul
exit
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@echo off
:a【换行符】echo %time%&goto:a
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:: 保存为create.bat 桌面双击之，就可生成测试代码test.bat
@echo off&setlocal enabledelayedexpansion
set nl=^


(echo @echo off
echo :a!nl!echo %%time%%^&goto:a
)>test.bat
pause
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@echo off
if "%1"=="ray" goto ray
start /b "" cmd /c "%~0" ray
echo,
call :a
echo [4]
exit

:a
echo [2]
dir /b
call :b
goto :Eof

:ray
set var=0
:loop
set /a var+=1
echo.
echo [1]多行不是问题了。共循环 %var% 次。
echo.
pause>nul
if %var% lss 5 goto loop
exit /b

:b
echo.
echo [3]I'am here
echo.
goto :eof
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set nb=0
:a
set /a nb+=1
echo %%time%%
if %nb% lss 300 (goto b) else (goto a)
exit
:b
echo OK***************
for /l %%a in (1,1,10) do echo %random%
pause
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:: 保存为create.bat 桌面双击之，就可生成测试代码test.bat
:: 标签名后添加一个!nl!，一个!nl!表示一个回车。
:: 在编辑代码中，百分号要加倍；连接符&需加转移符，变成 ^&。
@echo off&setlocal enabledelayedexpansion
set nl=^
>test.bat (
echo @echo off
echo set nb=0!nl!:a!nl!set /a nb+=1^&echo %%time%%^&^(if %%nb%% lss 300 ^(goto a^) else ^(goto b^)^)^&pause^&exit!nl!:b!nl!echo OK***************^&(for /l ^%%^%%a in ^(1,1,10^) ^do echo %%random%%^)^&^pause
)
call test.bat
echo over
pause
 
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@echo on&setlocal enabledelayedexpansion
set nl=^

cmd /v:on  /c (:a!nl!&echo !time!&echo !time!&goto:a)
echo over
pause
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