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在之前的章节中，只有 fiberRootNode 在 mount 时 current !== null， current 指向了rootFiber，所以这里的 rootFiber 应为 fiberRootNode
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在之前的章节中，只有 fiberRootNode 在 mount 时 current !== null， current 指向了rootFiber，所以这里的 rootFiber 应为 fiberRootNode