# 数学公式
如果要在文章中显示数学公式，可以使用插件 [**hexo-filter-mathjax**](https://github.com/next-theme/hexo-filter-mathjax/)。
配置流程：
1. 在 Hexo 项目根目录下安装插件 **hexo-filter-mathjax**。
```bash
$ cd hexo-site
$ npm install hexo-filter-mathjax
```
2. 在 Hexo 配置文件 `_config.yml` 最底下增加如下配置。
```yaml
mathjax:
tags: none # or 'ams' or 'all'
single_dollars: true # enable single dollar signs as in-line math delimiters
cjk_width: 0.9 # relative CJK char width
normal_width: 0.6 # relative normal (monospace) width
append_css: true # add CSS to every page
every_page: false # if true, every page will be rendered by mathjax regardless the `mathjax` setting in Front-matter of each article
```
3. 在文章页添加 `mathjax: true` 属性，至此，就可以在该页面中写公式了。
示例：
```yaml
---
title: MathJax Test
date: 2020-09-12 16:02:07
tags: MathJax
categories: MathJax
mathjax: true
---
$$
i\hbar\frac{\partial}{\partial t}\psi=-\frac{\hbar^2}{2m}\nabla^2\psi+V\psi
$$
```
效果图：
---
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