Nuxt3 实战 (八)：优雅的实现暗黑主题模式

 pnpm add @nuxtjs/color-mode -D

 export default defineNuxtConfig({
   modules: ['@nuxtjs/color-mode']
 })

import { defineNuxtConfig } from 'nuxt'

 export default defineNuxtConfig({
   modules: ['@nuxtjs/color-mode'],
   colorMode: {
     preference: 'system', // default value of $colorMode.preference
     fallback: 'light', // fallback value if not system preference found
     hid: 'nuxt-color-mode-script',
     globalName: '__NUXT_COLOR_MODE__',
     componentName: 'ColorScheme',
     classPrefix: '',
     classSuffix: '-mode',
     storageKey: 'nuxt-color-mode'
   }
 })

<script setup lang="ts">
  const colorMode = useColorMode()

  // 切换模式
  const setColorMode = () => {
    colorMode.value = colorMode.value === 'dark' ? 'light' : 'dark'
  }

  // 判断是否支持 startViewTransition API
  const enableTransitions = () =>
    'startViewTransition' in document &&
    window.matchMedia('(prefers-reduced-motion: no-preference)').matches

  // 切换动画
  async function toggleDark({ clientX: x, clientY: y }: MouseEvent) {
    const isDark = colorMode.value === 'dark'

    if (!enableTransitions()) {
      setColorMode()
      return
    }

    const clipPath = [
      `circle(0px at ${x}px ${y}px)`,
      `circle(${Math.hypot(
        Math.max(x, innerWidth - x),
        Math.max(y, innerHeight - y)
      )}px at ${x}px ${y}px)`
    ]

    await document.startViewTransition(async () => {
      setColorMode()
      await nextTick()
    }).ready

    document.documentElement.animate(
      { clipPath: !isDark ? clipPath.reverse() : clipPath },
      {
        duration: 300,
        easing: 'ease-in',
        pseudoElement: `::view-transition-${!isDark ? 'old' : 'new'}(root)`
      }
    )
  }
  </script>

  <template>
    <el-tooltip
      :content="`切换${$colorMode.value === 'dark' ? '白天' : '黑夜'}模式`"
      placement="bottom"
    >
      <el-button
        circle
        text
        @click="toggleDark"
      >
        <Icon
          :name="$colorMode.value === 'dark' ? 'i-heroicons-moon-solid' : 'i-heroicons-sun-solid'"
          class="h-5 w-5"
        />
      </el-button>
    </el-tooltip>
  </template>

  <style>
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none;
    mix-blend-mode: normal;
  }

  ::view-transition-old(root),
  .dark::view-transition-new(root) {
    z-index: 1;
  }

  ::view-transition-new(root),
  .dark::view-transition-old(root) {
    z-index: 9999;
  }
  </style>

<ColorMode />