When pendingCommit is detected, it immediately enters the commit phase.
function commitAllWork(fiber: Fiber): void;
Pass in pendingCommit (an EffectFibers linked list, which is actually the effectList property of rootFiber,rootFiber is equivalent to a Fiber linked list. Isn't JS array a kind of linked list, or is it an iterable object (Iteratable)?
function commitAllWork(fiber: Fiber) {
// 遍历effectList链表,对每个EffectFiber执行commitWork操作
fiber.effectList.forEach(commitWork);
// 所有任务commit完毕后,将workInProgress和pendingCommit置空
workInProgress = null;
pendingCommit = null;
}