暗黑模式

暗黑模式

为你的 Astro 应用添加暗黑模式。

创建内联主题脚本

src/pages/index.astro

---
import '../styles/globals.css'
---
<script is:inline>
    const getThemePreference = () => {
        if (typeof localStorage !== 'undefined' && localStorage.getItem('theme')) {
            return localStorage.getItem('theme');
        }
        return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
    };
    const isDark = getThemePreference() === 'dark';
    document.documentElement.classList[isDark ? 'add' : 'remove']('dark');
    if (typeof localStorage !== 'undefined') {
        const observer = new MutationObserver(() => {
            const isDark = document.documentElement.classList.contains('dark');
            localStorage.setItem('theme', isDark ? 'dark' : 'light');
        });
        observer.observe(document.documentElement, { attributes: true, attributeFilter: ['class'] });
    }
</script>
<html lang="en">
    <body>
      <h1>Astro</h1>
    </body>
</html>

添加模式切换

src/components/ModeToggle.tsx

import * as React from "react"
import { Moon, Sun } from "lucide-react"
import { Button } from "@/components/ui/button"
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
export function ModeToggle() {
  const [theme, setThemeState] = React.useState<
    "theme-light" | "dark" | "system"
  >("theme-light")
  React.useEffect(() => {
    const isDarkMode = document.documentElement.classList.contains("dark")
    setThemeState(isDarkMode ? "dark" : "theme-light")
  }, [])
  React.useEffect(() => {
    const isDark =
      theme === "dark" ||
      (theme === "system" &&
        window.matchMedia("(prefers-color-scheme: dark)").matches)
    document.documentElement.classList[isDark ? "add" : "remove"]("dark")
  }, [theme])
  return (
    <DropdownMenu>
      <DropdownMenuTrigger asChild>
        <Button variant="outline" size="icon">
          <Sun className="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
          <Moon className="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
          <span className="sr-only">切换主题</span>
        </Button>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuItem onClick={() => setThemeState("theme-light")}>
          光明模式
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setThemeState("dark")}>
          暗黑模式
        </DropdownMenuItem>
        <DropdownMenuItem onClick={() => setThemeState("system")}>
          系统模式
        </DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  )
}

显示模式切换

在你的站点上添加一个模式切换按钮，以在光明模式和暗黑模式之间切换。

src/pages/index.astro

---
import '../styles/globals.css'
import { ModeToggle } from '@/components/ModeToggle';
---
<!-- 内联脚本 -->
<html lang="en">
    <body>
      <h1>Astro</h1>
      <ModeToggle client:load />
    </body>
</html>