我们可以通过优雅地将元素过渡到 DOM 中和从 DOM 中移出，从而制作更具吸引力的用户界面。Svelte 使用 transition 指令使此操作变得非常容易。
¥We can make more appealing user interfaces by gracefully transitioning elements into and out of the DOM. Svelte makes this very easy with the transition directive.
首先，从 svelte/transition 导入 fade 函数...
¥First, import the fade function from svelte/transition...
App
<script>
import { fade } from 'svelte/transition';
let visible = $state(true);
</script><script lang="ts">
import { fade } from 'svelte/transition';
let visible = $state(true);
</script>...然后将其添加到 <p> 元素：
¥...then add it to the <p> element:
App
<p transition:fade>
Fades in and out
</p>1
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<script>
let visible = $state(true);
</script>
<label>
<input type="checkbox" bind:checked={visible} />visible
</label>
{#if visible}<p>
Fades in and out
</p>
{/if}