内联组件
export const Counter = () => {
const [count, setCount] = useState(0)
const increment = () => setCount(count + 1)
const decrement = () => setCount(count - 1)
return (
<div>
<button onClick={decrement}>-</button>
<span>{count}</span>
<button onClick={increment}>+</button>
</div>
)
}
<Counter />
导入组件
/snippets/ 文件夹中。更多信息请参阅 可复用片段。
不支持嵌套导入。请将所有被引用的组件直接导入到父 MDX 文件中。
snippets/ 中创建一个组件文件：
/snippets/color-generator.jsx
export const ColorGenerator = () => {
const [hue, setHue] = useState(180)
const [saturation, setSaturation] = useState(50)
const [lightness, setLightness] = useState(50)
const [colors, setColors] = useState([])
useEffect(() => {
const newColors = []
for (let i = 0; i < 5; i++) {
const l = Math.max(10, Math.min(90, lightness - 20 + i * 10))
newColors.push(`hsl(${hue}, ${saturation}%, ${l}%)`)
}
setColors(newColors)
}, [hue, saturation, lightness])
const copyToClipboard = (color) => {
navigator.clipboard
.writeText(color)
.then(() => {
console.log(`Copied ${color} to clipboard!`)
})
.catch((err) => {
console.error("Failed to copy: ", err)
})
}
return (
<div className="p-4 border dark:border-zinc-950/80 rounded-xl not-prose">
<div className="space-y-4">
<div className="space-y-2">
<label className="block text-sm text-zinc-950/70 dark:text-white/70">
Hue: {hue}°
<input
type="range"
min="0"
max="360"
value={hue}
onChange={(e) => setHue(Number.parseInt(e.target.value))}
className="w-full h-2 bg-zinc-950/20 rounded-lg appearance-none cursor-pointer dark:bg-white/20 mt-1"
style={{
background: `linear-gradient(to right,
hsl(0, ${saturation}%, ${lightness}%),
hsl(60, ${saturation}%, ${lightness}%),
hsl(120, ${saturation}%, ${lightness}%),
hsl(180, ${saturation}%, ${lightness}%),
hsl(240, ${saturation}%, ${lightness}%),
hsl(300, ${saturation}%, ${lightness}%),
hsl(360, ${saturation}%, ${lightness}%))`,
}}
/>
</label>
<label className="block text-sm text-zinc-950/70 dark:text-white/70">
Saturation: {saturation}%
<input
type="range"
min="0"
max="100"
value={saturation}
onChange={(e) => setSaturation(Number.parseInt(e.target.value))}
className="w-full h-2 bg-zinc-950/20 rounded-lg appearance-none cursor-pointer dark:bg-white/20 mt-1"
style={{
background: `linear-gradient(to right,
hsl(${hue}, 0%, ${lightness}%),
hsl(${hue}, 50%, ${lightness}%),
hsl(${hue}, 100%, ${lightness}%))`,
}}
/>
</label>
<label className="block text-sm text-zinc-950/70 dark:text-white/70">
Lightness: {lightness}%
<input
type="range"
min="0"
max="100"
value={lightness}
onChange={(e) => setLightness(Number.parseInt(e.target.value))}
className="w-full h-2 bg-zinc-950/20 rounded-lg appearance-none cursor-pointer dark:bg-white/20 mt-1"
style={{
background: `linear-gradient(to right,
hsl(${hue}, ${saturation}%, 0%),
hsl(${hue}, ${saturation}%, 50%),
hsl(${hue}, ${saturation}%, 100%))`,
}}
/>
</label>
</div>
<div className="flex space-x-1">
{colors.map((color, idx) => (
<div
key={idx}
className="h-16 rounded flex-1 cursor-pointer transition-transform hover:scale-105"
style={{ backgroundColor: color }}
title={`Click to copy: ${color}`}
onClick={() => copyToClipboard(color)}
/>
))}
</div>
<div className="text-sm font-mono text-zinc-950/70 dark:text-white/70">
<p>
Base color: hsl({hue}, {saturation}%, {lightness}%)
</p>
</div>
</div>
</div>
)
}
import { ColorGenerator } from "/snippets/color-generator.jsx"
<ColorGenerator />
注意事项
- SEO：搜索引擎可能无法完全索引由客户端渲染的动态内容。
- 首次加载：访客在组件渲染之前可能会看到闪烁。
- 可访问性：确保屏幕阅读器能够播报动态内容的变化。
- 优化依赖数组：仅在
useEffect中包含必要的依赖。 - 缓存昂贵操作：在适当之处使用
useMemo或useCallback。 - 减少重新渲染：将大型组件拆分为较小的组件。
- 懒加载：组件代码无法懒加载。所有组件都会随页面一起加载。如果某个组件在挂载时会执行资源密集型操作（例如获取数据或进行大量计算），请使用条件渲染，将其挂载推迟到用户交互时。