小主可以把事件处理函数以属性的形式传递给组件. 就像在Stepper.svelte中，添加increment和decrement两个属性:

You can pass event handlers to components like any other prop. In Stepper.svelte, add increment and decrement props...

<script>
	let { increment, decrement } = $props();
</script>

<script lang="ts">
	let { increment, decrement } = $props();
</script>

然后把他们绑定到Dom节点上：

...and wire them up:

<button onclick={decrement}>-1</button>
<button onclick={increment}>+1</button>

在App.svelte中定义事件处理函数: In App.svelte, define the handlers:

<Stepper
	increment={() => value += 1}
	decrement={() => value -= 1}
/>

小主坚持住，再进阶一点就可以突破到小一阶段了.