generateViewport

你可以使用静态 viewport 对象或动态 generateViewport 函数自定义页面的初始视口。

¥You can customize the initial viewport of the page with the static viewport object or the dynamic generateViewport function.

需要了解：

¥Good to know:

• 仅服务器组件支持 viewport 对象和 generateViewport 函数导出。

  ¥The viewport object and generateViewport function exports are only supported in Server Components.

• 你不能从同一线路段同时导出 viewport 对象和 generateViewport 功能。

  ¥You cannot export both the viewport object and generateViewport function from the same route segment.

• 如果你刚刚迁移 metadata 导出，则可以使用 元数据到视口导出 codemod 来更新你的更改。

  ¥If you're coming from migrating metadata exports, you can use metadata-to-viewport-export codemod to update your changes.

viewport 对象

¥The viewport object

要定义视口选项，请从 layout.jsx 或 page.jsx 文件导出 viewport 对象。

¥To define the viewport options, export a viewport object from a layout.jsx or page.jsx file.

import type { Viewport } from 'next'

export const viewport: Viewport = {
  themeColor: 'black',
}

export default function Page() {}

export const viewport = {
  themeColor: 'black',
}

export default function Page() {}

generateViewport 功能

¥generateViewport function

generateViewport 应返回包含一个或多个视口字段的 Viewport 对象。

¥generateViewport should return a Viewport object containing one or more viewport fields.

export function generateViewport({ params }) {
  return {
    themeColor: '...',
  }
}

export function generateViewport({ params }) {
  return {
    themeColor: '...',
  }
}

需要了解：

¥Good to know:

• 如果视口不依赖于运行时信息，则应使用静态 viewport 对象 而不是 generateViewport 来定义它。

  ¥If the viewport doesn't depend on runtime information, it should be defined using the static viewport object rather than generateViewport.

视口字段

¥Viewport Fields

themeColor

了解有关 theme-color 的更多信息。

¥Learn more about theme-color.

简单主题颜色

¥Simple theme color

import type { Viewport } from 'next'

export const viewport: Viewport = {
  themeColor: 'black',
}

export const viewport = {
  themeColor: 'black',
}

<meta name="theme-color" content="black" />

使用 media 属性

¥With media attribute

import type { Viewport } from 'next'

export const viewport: Viewport = {
  themeColor: [
    { media: '(prefers-color-scheme: light)', color: 'cyan' },
    { media: '(prefers-color-scheme: dark)', color: 'black' },
  ],
}

export const viewport = {
  themeColor: [
    { media: '(prefers-color-scheme: light)', color: 'cyan' },
    { media: '(prefers-color-scheme: dark)', color: 'black' },
  ],
}

<meta name="theme-color" media="(prefers-color-scheme: light)" content="cyan" />
<meta name="theme-color" media="(prefers-color-scheme: dark)" content="black" />

width、initialScale、maximumScale 和 userScalable

¥width, initialScale, maximumScale and userScalable

需要了解：viewport 元标记是自动设置的，通常不需要手动配置，因为默认值就足够了。然而，提供该信息是为了完整性。

¥Good to know: The viewport meta tag is automatically set, and manual configuration is usually unnecessary as the default is sufficient. However, the information is provided for completeness.

import type { Viewport } from 'next'

export const viewport: Viewport = {
  width: 'device-width',
  initialScale: 1,
  maximumScale: 1,
  userScalable: false,
  // Also supported but less commonly used
  // interactiveWidget: 'resizes-visual',
}

export const viewport = {
  width: 'device-width',
  initialScale: 1,
  maximumScale: 1,
  userScalable: false,
  // Also supported but less commonly used
  // interactiveWidget: 'resizes-visual',
}

<meta
  name="viewport"
  content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"
/>

colorScheme

了解有关 color-scheme 的更多信息。

¥Learn more about color-scheme.

import type { Viewport } from 'next'

export const viewport: Viewport = {
  colorScheme: 'dark',
}

export const viewport = {
  colorScheme: 'dark',
}

<meta name="color-scheme" content="dark" />

类型

¥Types

你可以使用 Viewport 类型向视口对象添加类型安全性。如果你在 IDE 中使用 内置 TypeScript 插件，则无需手动添加类型，但如果需要，你仍然可以显式添加它。

¥You can add type safety to your viewport object by using the Viewport type. If you are using the built-in TypeScript plugin in your IDE, you do not need to manually add the type, but you can still explicitly add it if you want.

viewport 对象

¥viewport object

import type { Viewport } from 'next'

export const viewport: Viewport = {
  themeColor: 'black',
}

generateViewport 功能

¥generateViewport function

常规功能

¥Regular function

import type { Viewport } from 'next'

export function generateViewport(): Viewport {
  return {
    themeColor: 'black',
  }
}

带分段属性

¥With segment props

import type { Viewport } from 'next'

type Props = {
  params: Promise<{ id: string }>
  searchParams: Promise<{ [key: string]: string | string[] | undefined }>
}

export function generateViewport({ params, searchParams }: Props): Viewport {
  return {
    themeColor: 'black',
  }
}

export default function Page({ params, searchParams }: Props) {}

JavaScript 项目

¥JavaScript Projects

对于 JavaScript 项目，你可以使用 JSDoc 添加类型安全。

¥For JavaScript projects, you can use JSDoc to add type safety.

/** @type {import("next").Viewport} */
export const viewport = {
  themeColor: 'black',
}

版本历史

¥Version History

版本	更改
v14.0.0	引入了 viewport 和 generateViewport。