我们可以轻松地为 Nested.svelte 中的 props 指定默认值：
¥We can easily specify default values for props in Nested.svelte:
Nested
<script>
let { answer = 'a mystery' } = $props();
</script><script lang="ts">
let { answer = 'a mystery' } = $props();
</script>如果我们现在添加第二个没有 answer prop 的组件，它将恢复为默认值：
¥If we now add a second component without an answer prop, it will fall back to the default:
App
<Nested answer={42}/>
<Nested />1
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<script>
import Nested from './Nested.svelte';
</script>
<Nested answer={42} />