ppt上的
// reactFiberScheduler.js

while (
      nextFlushedRoot !== null &&
      nextFlushedExpirationTime !== NoWork &&
      (minExpirationTime === NoWork ||
        minExpirationTime >= nextFlushedExpirationTime) &&
      (!deadlineDidExpire || currentRendererTime >= nextFlushedExpirationTime)
    )

我看到的16.7.0 tag
是这样的：

while (
      nextFlushedRoot !== null &&
      nextFlushedExpirationTime !== NoWork &&
      minExpirationTime <= nextFlushedExpirationTime &&
      !(didYield && currentRendererTime > nextFlushedExpirationTime)
    )

// 变成了didYield === false 或者 currentRendererTime <nextFlushedExpirationTime 才会执行下面的
didYield = false || 当前任务未超时？

performWorkOnRoot(
        nextFlushedRoot,
        nextFlushedExpirationTime,
        currentRendererTime > nextFlushedExpirationTime,
      );