有时你事先不知道需要渲染哪个元素。而不是拥有一长串 {#if ...} 块……
¥Sometimes you don’t know in advance which element needs to be rendered. Rather than having a long list of {#if ...} blocks...
App
{#if selected === 'h1'}
<h1>I'm a <code><h1></code> element</h1>
{:else}
<p>TODO others</p>
{/if}...我们可以使用 <svelte:element>：
¥...we can use <svelte:element>:
App
<svelte:element this={selected}>
I'm a <code><{selected}></code> element
</svelte:element>this 值可以是任何字符串，也可以是假值 - 如果是假值，则不会渲染任何元素。
¥The this value can be any string, or a falsy value — if it’s falsy, no element is rendered.
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<script>
const options = ['h1', 'h2', 'h3', 'p', 'marquee'];
let selected = $state(options[0]);
</script>
<select bind:value={selected}> {#each options as option} <option value={option}>{option}</option> {/each}</select>
{#if selected === 'h1'}<h1>I'm a <code><h1></code> element</h1>
{:else}<p>TODO others</p>
{/if}