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本文深度剖析了 React 的初始挂载渲染管线，系统性地阐述了从 createRoot().render() 调用到最终 DOM 节点呈现的完整过程。内容详细拆解了 Fiber 架构下的四大核心阶段——触发、调度、渲染和提交，并深入到 beginWork, completeWork 和 commitMutationEffects 等内部工作单元。
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