<svelte:window>

<svelte:window onevent={handler} />

<svelte:window bind:prop={value} />

<svelte:window> 元素允许你向 window 对象添加事件监听器，而不必担心在组件被销毁时删除它们，或者在服务器端渲染时检查 window 是否存在。

¥The <svelte:window> element allows you to add event listeners to the window object without worrying about removing them when the component is destroyed, or checking for the existence of window when server-side rendering.

此元素只能出现在组件的顶层 - 它不能位于块或元素内。

¥This element may only appear at the top level of your component — it cannot be inside a block or element.

<script>
	function handleKeydown(event) {
		alert(`pressed the ${event.key} key`);
	}
</script>

<svelte:window onkeydown={handleKeydown} />

你还可以绑定到以下属性：

¥You can also bind to the following properties:

• innerWidth

• innerHeight

• outerWidth

• outerHeight

• scrollX

• scrollY

• online — window.navigator.onLine 的别名

  ¥online — an alias for window.navigator.onLine

• devicePixelRatio

除 scrollX 和 scrollY 之外的所有文件都是只读的。

¥All except scrollX and scrollY are readonly.

<svelte:window bind:scrollY={y} />

请注意，页面不会滚动到初始值，以避免出现可访问性问题。只有对 scrollX 和 scrollY 绑定变量的后续更改才会引起滚动。如果你有正当理由在组件渲染时滚动，请在 $effect 中调用 scrollTo()。