<xml>
<add link='a' value='c' />
<add link='a' value='b' />
<add link='a' value='c' />
</xml>
<xsl:for-each select="xml/add[@link='a'][not(following::add/@value=@value)]">
<link rel="stylesheet" href="{@value}" type="text/css" />
</xsl:for-each> 原文链接：https://www.f2er.com/xml/296980.html
