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随便复制一个css，改名为base.user.css，里面粘贴如下内容保存后重启Typora，输入标
题时会自动出现序号
/** initialize css counter */
#write {
counter-reset: h1
}
h1 {
counter-reset: h2
}
h2 {
counter-reset: h3
}
h3 {
counter-reset: h4
}
h4 {
counter-reset: h5
}
h5 {
counter-reset: h6
}
/** put counter result into headings */
#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 /** override the default style for focused headings */ {
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) ".
"}
/** override the default style for focused headings */
#write>h3.md-focus:before,
#write>h4.md-focus:before,
#write>h5.md-focus:before,
#write>h6.md-focus:before,
h3.md-focus:before,
h4.md-focus:before,
h5.md-focus:before,
h6.md-focus:before {
color: inherit;
border: inherit;
border-radius: inherit;
position: inherit;
left:initial;
float: none;
top:initial;
font-size: inherit;
padding-left: inherit;
padding-right: inherit;
vertical-align: inherit;
font-weight: inherit;
line-height: inherit;
}
去除序号后面 . 号的版本：
/** initialize css counter */
#write {
counter-reset: h1
}
h1 {
counter-reset: h2
}
h2 {
counter-reset: h3
}
h3 {
counter-reset: h4
}
h4 {
counter-reset: h5
}
h5 {
counter-reset: h6
}
/** put counter result into headings */
#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 /** override the default style for focused headings */ {
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) " "
}
/** override the default style for focused headings */
#write>h3.md-focus:before,
#write>h4.md-focus:before,
#write>h5.md-focus:before,
#write>h6.md-focus:before,
h3.md-focus:before,
h4.md-focus:before,
h5.md-focus:before,
h6.md-focus:before {
color: inherit;
border: inherit;
border-radius: inherit;
position: inherit;
left:initial;
float: none;
top:initial;
font-size: inherit;
padding-left: inherit;
padding-right: inherit;
vertical-align: inherit;
font-weight: inherit;
line-height: inherit;
}