# 代码高亮

**docsify**内置的代码高亮工具是 [Prism](https://github.com/PrismJS/prism)。Prism 默认支持的语言如下：

* Markup - `markup`, `html`, `xml`, `svg`, `mathml`, `ssml`, `atom`, `rss`
* CSS - `css`
* C-like - `clike`
* JavaScript - `javascript`, `js`

[添加额外的语法支持](https://prismjs.com/#supported-languages)需要通过CDN添加相应的[语法文件](https://cdn.jsdelivr.net/npm/prismjs@1/components/) :

```html
<script src="//cdn.jsdelivr.net/npm/prismjs@1/components/prism-bash.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/prismjs@1/components/prism-php.min.js"></script>
```

要使用语法高亮，需要在代码块第一行添加对应的[语言声明](https://prismjs.com/#supported-languages)，示例如下:

````
```html
<p>This is a paragraph</p>
<a href="//docsify.js.org/">Docsify</a>
```

```bash
echo "hello"
```

```php
function getAdder(int $x): int 
{
    return 123;
}
```
````

上面代码的渲染结果:

```html
<p>This is a paragraph</p>
<a href="//docsify.js.org/">Docsify</a>
```

```bash
echo "hello"
```

```php
function getAdder(int $x): int 
{
    return 123;
}
```