TypeError when ownerDocument.defaultView is null in offset() during onEnterPrepare

[jeasonnow]

复现场景

iOS Safari / App WebView
Modal 打开触发 onAppearPrepare
doc.defaultView || doc.parentWindow 为 null
访问 pageXOffset 崩溃

猜测修复方式

function getScroll(w?: Window | null, top?: boolean): number {
if (!w) return 0;
// ...
}

dialog/src/util.ts

Lines 11 to 22 in 3ebf65c

	function getScroll(w: Window, top?: boolean): number {
	let ret = w[`page${top ? 'Y' : 'X'}Offset`];
	const method = `scroll${top ? 'Top' : 'Left'}`;
	if (typeof ret !== 'number') {
	const d = w.document;
	ret = d.documentElement[method];
	if (typeof ret !== 'number') {
	ret = d.body[method];
	}
	}
	return ret;
	}