请教小红花阅读的下一章如何获取

想添加一下小红花阅读，发现下一章获取不了，请指点。 https://xhhread.com/read/reading.jhtml?chapterid=8aada6395a597779015a93a372c90a55 自己添加的代码：

// @include        *://xhhread.com/read/*
{siteName: "小红花阅读",
url: "https?://xhhread\\.com/read/*",
titleSelector: ".reading-title",
contentSelector: ".middle-wrapper2",
nextSelector: '.reading-end a:nth-of-type(1)',
prevSelector: '.reading-end a:nth-of-type(2)',
indexSelector: '.reading-end a:nth-of-type(3)',
contentRemove: '.zan',
},

底部导航栏部分的页面代码是这样的：

    <!--底部导航栏-->
<div class="reading-end middle-wrapper2">
<a class="cannot">上一章</a>
<a class="H_content" p="8aada6395a597779015a898b0e530308" target="_self" style="center">目录</a>
<a class="H_readnextforwap" p="8aada6395a597779015a93a372c90a55" target="self">下一章</a>
</div>

手动点击下一章之后的link实际为 https://xhhread.com/read/readnextforwap.jhtml?chapterid=8aada6395a597779015a93a372c90a55 这种方式该如何在脚本里获取下一章？

{siteName: '小红花阅读网',
exampleUrl: 'https://xhhread.com/read/reading.jhtml?chapterid=8aada6395a597779015a93a372c90a55',
url: '^https?://xhhread\\.com/read/read\\w+\\.jhtml\\?chapterid=.*',
bookTitleSelector: '.H_book',
titleSelector: '.reading-title',
contentPatch: function($doc) {
// 修正上下页链接
var rules = {
'.H_readpreforwap': 'https://xhhread.com/read/readpreforwap.jhtml?chapterid=',
'.H_content': 'https://xhhread.com/read/contents.jhtml?storyid=',
'.H_readnextforwap': 'https://xhhread.com/read/readnextforwap.jhtml?chapterid=',
};
Object.keys(rules).forEach(function(selector) {
var $link = $doc.find(selector);
var chapterId = $link.attr('p');
if (chapterId) {
var url = rules[selector];
$link.attr('href', url + chapterId);
}
});
}
},

多谢，果然要增加函数啊