Function dispatchEvent

packages/react-dom/src/SyntheticEvent.ts:60–84

(container: Container, eventType: string, e: Event)

}

function dispatchEvent(container: Container, eventType: string, e: Event) {
	const targetElement = e.target;

	if (targetElement === null) {
		console.warn('事件不存在target', e);
		return;
	}

	// 1. 收集沿途的事件
	const { bubble, capture } = collectPaths(
		targetElement as DOMElement,
		container,
		eventType
	);
	// 2. 构造合成事件
	const se = createSyntheticEvent(e);

	// 3. 遍历captue
	triggerEventFlow(capture, se);

	if (!se.__stopPropagation) {
		// 4. 遍历bubble
		triggerEventFlow(bubble, se);
	}
}

function triggerEventFlow(paths: EventCallback[], se: SyntheticEvent) {
	for (let i = 0; i < paths.length; i++) {