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---
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outline: deep
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---
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# 扩展默认主题 {#extending-the-default-theme}
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VitePress 默认的主题已经针对文档进行了优化,并且可以进行自定义。请参考[默认主题配置概览](../reference/default-theme-config)获取完整的选项列表。
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但是有一些情况仅靠配置是不够的。例如:
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1. 需要调整 CSS 样式;
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2. 需要修改 Vue 应用实例,例如注册全局组件;
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3. 需要通过 layout 插槽将自定义内容注入到主题中;
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这些高级自定义配置将需要使用自定义主题来“拓展”默认主题。
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:::tip
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在继续之前,请确保首先阅读[自定义主题](./custom-theme)以了解其工作原理。
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:::
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## 自定义 CSS {#customizing-css}
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可以通过覆盖根级别的 CSS 变量来自定义默认主题的 CSS:
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```js
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// .vitepress/theme/index.js
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import DefaultTheme from 'vitepress/theme'
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import './custom.css'
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export default DefaultTheme
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```
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```css
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/* .vitepress/theme/custom.css */
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:root {
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--vp-c-brand-1: #646cff;
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--vp-c-brand-2: #747bff;
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}
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```
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查看[默认主题 CSS 变量](https://github.com/vuejs/vitepress/blob/main/src/client/theme-default/styles/vars.css)来获取可以被覆盖的变量。
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## 使用自定义字体 {#using-different-fonts}
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VitePress 使用 [Inter](https://rsms.me/inter/) 作为默认字体,并且将其包含在生成的输出中。该字体在生产环境中也会自动预加载。但是如果要使用不同的字体,这可能不是很好。
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为了避免在生成后的输出中包含 Inter 字体,请从 `vitepress/theme-without-fonts` 中导入主题:
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```js
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// .vitepress/theme/index.js
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import DefaultTheme from 'vitepress/theme-without-fonts'
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import './my-fonts.css'
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export default DefaultTheme
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```
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```css
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/* .vitepress/theme/custom.css */
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:root {
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--vp-font-family-base: /* normal text font */
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--vp-font-family-mono: /* code font */
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}
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```
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::: warning
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如果你在使用像是[团队页](/reference/default-theme-team-page)这样的组件,请确保也从 `vitepress/theme-without-fonts` 中导入它们!
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:::
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如果字体是通过 `@font-face` 引用的本地文件,它将会被作为资源被包含在 `.vitepress/dist/asset` 目录下,并且使用哈希后的文件名。为了预加载这个文件,请使用 [transformHead](/reference/site-config#transformhead) 构建钩子:
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```js
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// .vitepress/config.js
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export default {
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transformHead({ assets }) {
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// 相应地调整正则表达式以匹配字体
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const myFontFile = assets.find(file => /font-name\.\w+\.woff2/)
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if (myFontFile) {
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return [
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[
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'link',
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{
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rel: 'preload',
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href: myFontFile,
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as: 'font',
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type: 'font/woff2',
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crossorigin: ''
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}
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]
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]
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}
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}
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}
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```
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## 注册全局组件 {#registering-global-components}
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```js
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// .vitepress/theme/index.js
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import DefaultTheme from 'vitepress/theme'
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/** @type {import('vitepress').Theme} */
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export default {
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extends: DefaultTheme,
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enhanceApp({ app }) {
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// 注册自定义全局组件
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app.component('MyGlobalComponent' /* ... */)
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}
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}
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```
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如果使用 TypeScript:
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```ts
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// .vitepress/theme/index.ts
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import type { Theme } from 'vitepress'
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import DefaultTheme from 'vitepress/theme'
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export default {
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extends: DefaultTheme,
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enhanceApp({ app }) {
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// 注册自定义全局组件
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app.component('MyGlobalComponent' /* ... */)
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}
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} satisfies Theme
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```
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因为我们使用 Vite,还可以利用 Vite 的 [glob 导入功能](https://cn.vitejs.dev/guide/features.html#glob-import)来自动注册一个组件目录。
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## 布局插槽 {#layout-slots}
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默认主题的 `<Layout/>` 组件有一些插槽,能够被用来在页面的特定位置注入内容。下面这个例子展示了将一个组件注入到 outline 之前:
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```js
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// .vitepress/theme/index.js
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import DefaultTheme from 'vitepress/theme'
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import MyLayout from './MyLayout.vue'
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export default {
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extends: DefaultTheme,
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// 使用注入插槽的包装组件覆盖 Layout
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Layout: MyLayout
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}
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```
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```vue
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<!--.vitepress/theme/MyLayout.vue-->
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<script setup>
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import DefaultTheme from 'vitepress/theme'
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const { Layout } = DefaultTheme
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</script>
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<template>
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<Layout>
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<template #aside-outline-before>
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My custom sidebar top content
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</template>
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</Layout>
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</template>
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```
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也可以使用渲染函数。
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```js
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// .vitepress/theme/index.js
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import { h } from 'vue'
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import DefaultTheme from 'vitepress/theme'
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import MyComponent from './MyComponent.vue'
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export default {
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extends: DefaultTheme,
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Layout() {
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return h(DefaultTheme.Layout, null, {
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'aside-outline-before': () => h(MyComponent)
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})
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}
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}
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```
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默认主题布局的全部可用插槽如下:
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- 当 `layout: 'doc'` (默认) 在 frontmatter 中被启用时:
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- `doc-top`
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- `doc-bottom`
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- `doc-footer-before`
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- `doc-before`
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- `doc-after`
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- `sidebar-nav-before`
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- `sidebar-nav-after`
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- `aside-top`
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- `aside-bottom`
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- `aside-outline-before`
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- `aside-outline-after`
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- `aside-ads-before`
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- `aside-ads-after`
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- 当 `layout: 'home'` 在 frontmatter 中被启用时:
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- `home-hero-before`
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- `home-hero-info`
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- `home-hero-image`
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- `home-hero-after`
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- `home-features-before`
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- `home-features-after`
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- 当 `layout: 'page'` 在 frontmatter 中被启用时:
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- `page-top`
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- `page-bottom`
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- 当未找到页面 (404) 时:
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- `not-found`
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- 总是启用:
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- `layout-top`
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- `layout-bottom`
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- `nav-bar-title-before`
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- `nav-bar-title-after`
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- `nav-bar-content-before`
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- `nav-bar-content-after`
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- `nav-screen-content-before`
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- `nav-screen-content-after`
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## 使用视图过渡 API
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### 关于外观切换 {#on-appearance-toggle}
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可以扩展默认主题以在切换颜色模式时提供自定义过渡动画。例如:
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```vue
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<!-- .vitepress/theme/Layout.vue -->
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<script setup lang="ts">
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import { useData } from 'vitepress'
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import DefaultTheme from 'vitepress/theme'
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import { nextTick, provide } from 'vue'
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const { isDark } = useData()
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const enableTransitions = () =>
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'startViewTransition' in document &&
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window.matchMedia('(prefers-reduced-motion: no-preference)').matches
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provide('toggle-appearance', async ({ clientX: x, clientY: y }: MouseEvent) => {
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if (!enableTransitions()) {
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isDark.value = !isDark.value
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return
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}
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const clipPath = [
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`circle(0px at ${x}px ${y}px)`,
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`circle(${Math.hypot(
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Math.max(x, innerWidth - x),
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Math.max(y, innerHeight - y)
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)}px at ${x}px ${y}px)`
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]
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await document.startViewTransition(async () => {
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isDark.value = !isDark.value
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await nextTick()
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}).ready
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document.documentElement.animate(
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{ clipPath: isDark.value ? clipPath.reverse() : clipPath },
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{
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duration: 300,
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easing: 'ease-in',
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pseudoElement: `::view-transition-${isDark.value ? 'old' : 'new'}(root)`
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}
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)
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})
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</script>
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<template>
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<DefaultTheme.Layout />
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</template>
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<style>
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::view-transition-old(root),
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::view-transition-new(root) {
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animation: none;
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mix-blend-mode: normal;
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}
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::view-transition-old(root),
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.dark::view-transition-new(root) {
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z-index: 1;
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}
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::view-transition-new(root),
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.dark::view-transition-old(root) {
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z-index: 9999;
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}
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.VPSwitchAppearance {
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width: 22px !important;
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}
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.VPSwitchAppearance .check {
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transform: none !important;
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}
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</style>
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```
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Result (**warning!**: flashing colors, sudden movements, bright lights):
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<details>
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<summary>Demo</summary>
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![Appearance Toggle Transition Demo](/appearance-toggle-transition.webp)
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</details>
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有关视图过渡动画的更多详细信息,请参阅 [Chrome 文档](https://developer.chrome.com/docs/web-platform/view-transitions/)。
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### 路由切换时 {#on-route-change}
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即将到来。
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## 重写内部组件 {#overriding-internal-components}
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可以使用 Vite 的 [aliases](https://vitejs.dev/config/shared-options.html#resolve-alias) 来用自定义组件替换默认主题的组件:
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```ts
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import { fileURLToPath, URL } from 'node:url'
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import { defineConfig } from 'vitepress'
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export default defineConfig({
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vite: {
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resolve: {
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alias: [
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{
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find: /^.*\/VPNavBar\.vue$/,
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replacement: fileURLToPath(
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new URL('./components/CustomNavBar.vue', import.meta.url)
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)
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}
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]
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}
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}
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})
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```
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想要了解组件的确切名称请参考我们的[源代码](https://github.com/vuejs/vitepress/tree/main/src/client/theme-default/components)。因为组件是内部的,因此在小版本更迭中,它们名字改动的可能性很小。
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