回家路上

然而并不知道你每两个数字的对应关系是什么

@echo off & setlocal enabledelayedexpansion
set s=101,102,339,340,341,342,343,592,593,594,595
for %%i in (%s%) do (
	set /a n+=1,m=n%%2
	if !m!==0 (set sp=-)else set sp=,
	set re=!re!!sp!%%i
)
set s=%re:~1%
echo;%s%
pause
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回家路上

@echo off & setlocal enabledelayedexpansion
set s=101,102,339,340,341,342,343,592,593,594,595
for %%i in (%s%) do (
	if not defined end (
		set begin=%%i& set end=%%i
	) else (
		set /a flag=%%i-end-1
		if not !flag!==0 (
			set t=!t!,!begin!-!end!
			set begin=%%i& set end=%%i
		)else set end=%%i
	)
)
set t=%t%,%begin%-%end%
set s=%t:~1%

echo;%s%
pause
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再改一下O(∩_∩)O！

@echo off & setlocal enabledelayedexpansion
set s=101,102,339,340,341,342,343,592,593,594,595
for %%i in (%s%,shenmegui) do (
	if not defined end (
		set s=& set begin=%%i& set end=%%i
	) else (
		set /a flag=%%i-end-1
		if not !flag!==0 (
			if defined s (
				set s=!s!,!begin!-!end!
			)else set s=!begin!-!end!
			set begin=%%i& set end=%%i
		)else set end=%%i
	)
)
echo;%s%
pause & exit /b
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回家路上

只是赶巧了，如果你的s不是2开头，而是：

set s=3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
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就能正确显示，原因？你猜O(∩_∩)O！

回家路上

没看出前面的1a有什么特殊意义

C:>set b=1a

C:>set /a "2-b-1"
0
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删了吧

for %%i in (%s% a) do (
... ...
echo;!str:~1,-3!
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