1. 效果展示

2. 配置方法
文件-偏好设置-外观
,点击打开主题文件夹

- 创建文件
base.user.css
,文件内容如下
#write {
counter-reset: h1
}
h1 {
counter-reset: h2
}
h2 {
counter-reset: h3
}
h3 {
counter-reset: h4
}
h4 {
counter-reset: h5
}
h5 {
counter-reset: h6
}
#write h1:before {
counter-increment: h1;
content: counter(h1) ". "
}
#write h2:before {
counter-increment: h2;
content: counter(h1) "." counter(h2) ". "
}
#write h3:before,
h3.md-focus.md-heading:before {
counter-increment: h3;
content: counter(h1) "." counter(h2) "." counter(h3) ". "
}
#write h4:before,
h4.md-focus.md-heading:before {
counter-increment: h4;
content: counter(h1) "." counter(h2) "." counter(h3) "." counter(h4) ". "
}
#write h5:before,
h5.md-focus.md-heading:before {
counter-increment: h5;
content: counter(h1) "." counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) ". "
}
#write h6:before,
h6.md-focus.md-heading:before {
counter-increment: h6;
content: counter(h1) "." counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) "." counter(h6