0. 效果

1. 打开主题文件夹

• 文件 --> 偏好设置 --> 外观 --> 打开主题文件夹

  
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2. 打开主题文件（以github主题为例子）

• 打开github.css

  
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3. 添加代码

• 在github.css文件底部添加如下代码，保存后关闭文件

#write h1,
.markdown-section h1 {
    counter-reset: h2;
}

#write h2,
.markdown-section h2 {
    counter-reset: h3;
}

#write h3,
.markdown-section h3 {
    counter-reset: h4;
}

#write h4,
.markdown-section h4 {
    counter-reset: h5;
}

#write h5,
.markdown-section h5 {
    counter-reset: h6;
}

#write h2::before,
.markdown-section h2::before {
    counter-increment: h2;
    content: counter(h2) ". ";
}

#write h3::before,
.markdown-section h3::before {
    counter-increment: h3;
    content: counter(h2) "."counter(h3) " ";
}

#write h4::before,
.markdown-section h4::before {
    counter-increment: h4;
    content: counter(h2) "."counter(h3) "."counter(h4) " ";
}

#write h5::before,
.markdown-section h5::before {
    counter-increment: h5;
    content: none;
}

#write h6::before,
.markdown-section h6::before {
    counter-increment: h6;
    content: none;
}

4. 重新加载主题

• 重新打开Typora，选择刚才修改的主题，OK啦！

  
  image.png