aloha20200628

代码及说明如下。
一。用双引号包裹命令表达式 "wmic ..." 以免用转义字符的麻烦
二。用call子过程以便能从循环体尽早退出，不再打理 wmic 输出的多余行

@echo off
(call :getVn x1)
echo,%x1%
exit/b
:getVn
	for /f "skip=1" %%v in (' "wmic logicaldisk where deviceid="r:" get volumename" ') do (set "%1=%%v"&exit/b)
exit/b
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