本文主要是参考了文章Typora自动编号功能——最强版。但文章中的代码不使用h1级的标题，并且h1级的标题前两个也都不会计数。我想要使用h1级标题，并且所有标题都计数，于是将文章中的代码改为如下：

/* 正文标题区: #write */
/* [TOC]目录树区: .md-toc-content */
/* 侧边栏的目录大纲区: .sidebar-content */

/** initialize css counter */
#write, .sidebar-content,.md-toc-content{
	/* 设置全局计数器的基准 */
    counter-reset: h1
}

#write h1, .outline-h1, .md-toc-item.md-toc-h1 {
    counter-reset: h2
}

#write h2, .outline-h2, .md-toc-item.md-toc-h2 {
    counter-reset: h3
}

#write h3, .outline-h3, .md-toc-item.md-toc-h3 {
    counter-reset: h4
}

#write h4, .outline-h4, .md-toc-item.md-toc-h4 {
    counter-reset: h5
}

#write h5, .outline-h5, .md-toc-item.md-toc-h5 {
    counter-reset: h6
}


/*以下代码用于不计数h1级的第一个标题 */
/*
#write h1:before,
.outline-h1>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h1>.md-toc-inner:before {
    counter-increment: h1;
    content: counter(h1) ". "
}

#write h1:nth-of-type(1):before,
.outline-h1:nth-of-type(1)>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h1:nth-of-type(1)>.md-toc-inner:before
{
	counter-reset: h1;
	content: ""
}
*/

#write h1:before,
h1.md-focus.md-heading:before, /** override the default style for focused headings */
.outline-h1>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h1>.md-toc-inner:before {
	text-decoration: none;
    counter-increment: h1;
    content: counter(h1) "."
}

#write h2:before,
h2.md-focus.md-heading:before, /** override the default style for focused headings */
.outline-h2>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h2>.md-toc-inner:before {
	text-decoration: none;
    counter-increment: h2;
    content: counter(h1) "." counter(h2) "."
}

#write h3:before,
h3.md-focus.md-heading:before, /** override the default style for focused headings */
.outline-h3>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h3>.md-toc-inner:before {
	text-decoration: none;
    counter-increment: h3;
    content: counter(h1) "." counter(h2) "." counter(h3) ". " 
}

#write h4:before,
h4.md-focus.md-heading:before,
.outline-h4>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h4>.md-toc-inner:before {
	text-decoration: none;
    counter-increment: h4;
    content: counter(h1) "." counter(h2) "." counter(h3) "." counter(h4) ". "
}

#write h5:before,
h5.md-focus.md-heading:before,
.outline-h5>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h5>.md-toc-inner:before {
	text-decoration: none;
    counter-increment: h5;
    content: counter(h1) "." counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) ". " 
}

#write h6:before,
h6.md-focus.md-heading:before,
.outline-h6>.outline-item>.outline-label:before,
.md-toc-item.md-toc-h6>.md-toc-inner:before {
	text-decoration: none;
    counter-increment: h6;
    content: counter(h1) "." counter(h2) "." counter(h3) "." counter(h4) "." counter(h5) "." counter(h6) ". " 
}

/** override the default style for focused headings */
#write>h1.md-focus:before,
#write>h2.md-focus:before,
#write>h3.md-focus:before,
#write>h4.md-focus:before,
#write>h5.md-focus:before,
#write>h6.md-focus:before,
h1.md-focus:before,
h2.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;
}

具体使用方法可参考
Typora自动编号功能——最强版