百度了一下，这方面资料确实不多，没有给出具体的xsl文件怎么写，终于在下面的链接找到了参考：
https://stackoverflow.com/questions/48016246/wkhtmltopdf-style-table-of-conte
然后点到这个https://github.com/jsreport/jsreport-wkhtmltopdf/blob/master/lib/default-toc.xsl，
找到了一个样例，于是进行简单的改写，进行测试。
注意这里是样例的xsl，实际的不是这个
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:outline="http://wkhtmltopdf.org/outline"
xmlns="http://www.w3.org/1999/xhtml">
<xsl:output doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitiona
l.dtd"
indent="yes" />
<xsl:template match="outline:outline">
<html>
<head>
<title>Table of Contents</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
h1 {
text-align: center;
font-size: 20px;
font-family: arial;
}
div {border-bottom: 1px dashed rgb(200,200,200);}
span {float: right;}
li {list-style: none;}
ul {
font-size: 20px;
font-family: arial;
}
ul ul {font-size: 80%; }
ul {padding-left: 0em;}
ul ul {padding-left: 1em;}
a {text-decoration:none; color: black;}
</style>
</head>
<body>
<h1>Table of Contents</h1>
<ul><xsl:apply-templates select="outline:item/outline:item"/></ul>
</body>
</html>
</xsl:template>
<xsl:template match="outline:item">
<li>
<xsl:if test="@title!=''">
<div>
<a>
<xsl:if test="@link">
<xsl:attribute name="href"><xsl:value-of select="@link"/></xsl:attribute>
</xsl:if>
<xsl:if test="@backLink">
<xsl:attribute name="name"><xsl:value-of select="@backLink"/></xsl:attribute>
</xsl:if>
<xsl:value-of select="@title" />
</a>
<span> <xsl:value-of select="@page" /> </span>
</div>
</xsl:if>
<ul>
<xsl:comment>added to prevent self-closing tags in QtXmlPatterns</xsl:comment>
<xsl:apply-templates select="outline:item"/>
</ul>
</li>
</xsl:template>
</xsl:stylesheet>
