$host
當將元件編譯為自訂元素時，$host 符文可讓您存取主機元素，以便您（例如）發送自訂事件 (範例)
步進器
<svelte:options customElement="my-stepper" />
<script>
function dispatch(type) {
$host().dispatchEvent(new CustomEvent(type));
}
</script>
<button onclick={() => dispatch('decrement')}>decrement</button>
<button onclick={() => dispatch('increment')}>increment</button>應用程式
<script>
import './Stepper.svelte';
let count = $state(0);
</script>
<my-stepper
ondecrement={() => count -= 1}
onincrement={() => count += 1}
></my-stepper>
<p>count: {count}</p>