在侧边栏上，给当前页面的多级元素加上序号 multilevel nested lists numbering for sidebar items

[scil]

.vuepress/styles/index.scss

ul.sidebar-sub-headers {
  counter-reset: section;
  list-style-type: none;
}

li.sidebar-sub-header {
  &:before {
    counter-increment: section;
    content: counters(section, ".");
    padding-left: 1.75rem;
  }

  > a {
    display: inline;
    padding-left: .5rem !important;
  }
}

[Mister-Hope]

That's a wounderfull css trick, you are always welcome to do any customization your self.

Also all the theme components can be overided using alias.

[scil]

改进版，给所有导航条目，包括一个md文件内的导航，全部编上号

// 给这两种导航统一编号
// 各 md 文件的导航
.sidebar-group>ul.sidebar-links, 
// 一个 md 文件之内的导航
ul.sidebar-sub-headers   
{
  counter-reset: section;
  list-style-type: none;
  
  > li{
       &:before {
            counter-increment: section;
            content: counters(section, ".");
            padding-left: 1.75rem;
       }
 
       > .sidebar-group {       
           margin-top: -2em;
           margin-left: 0.8em;  
       }

       > a {
          display: inline;
          padding-left: .5rem !important;
       }
  }
}