任意网站添加目录

1. 也可以直接安装谷歌插件（Table of contents sidebar）

<script type="text/javascript" src="https://table-of-contents-sidebar.github.io/table-of-contents-sidebar-lib/table-of-contents-sidebar.js"></script>
<script type="text/javascript">
    window.onload = function(e){
        TableOfContents.init({
            basePath: "https://table-of-contents-sidebar.github.io/table-of-contents-sidebar-lib/",
            querySelector: "body" // or other css querySelector
        });
    }
</script>

2. 博客园的方法