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版本：3.2.1

Head 元数据

Customizing head metadata​

Docusaurus automatically sets useful page metadata in <html>, <head> and <body> for you. It is possible to add extra metadata (or override existing ones) with the <head> tag in Markdown files:

markdown-features-head-metadata.mdx
---
id: head-metadata
title: Head Metadata
---

<head>
  <html className="some-extra-html-class" />
  <body className="other-extra-body-class" />
  <title>Head Metadata customized title!</title>
  <meta charSet="utf-8" />
  <meta name="twitter:card" content="summary" />
  <link rel="canonical" href="https://docusaurus.io/docs/markdown-features/head-metadata" />
</head>

# Head Metadata

My text

This <head> declaration has been added to the current Markdown doc as a demo. 你可以打开浏览器的调试工具，看看本页面的元数据是如何被影响的。

备注

This feature is built on top of the Docusaurus <Head> component. Refer to react-helmet for exhaustive documentation.

You don't need this for regular SEO

Content plugins (e.g. docs and blog) provide front matter options like description, keywords, and image, which will be automatically applied to both description and og:description, while you would have to manually declare two metadata tags when using the <head> tag.

Markdown page description​

Markdown 页面的 description 元数据可能在 head 元数据之外还被用于更多地方。 For example, the docs plugin's generated category index uses the description metadata for the doc cards.

默认情况下，描述是第一行包含内容的文字。我们会尽量把它转化为纯文本。 例如，对于下面的文件：

# Title

Main content... May contain some [links](./file.mdx) or **emphasis**.

它的默认描述为「主要内容…… 还可能包含一些链接或者重点。」 However, it's not designed to be fully functional. 如果它不能产出一段合理的描述，你可以通过前言显式地提供一段：

---
description: This description will override the default.
---

# Title

Main content... May contain some [links](./file.mdx) or **emphasis**.