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本文深度剖析了 React Suspense 作为声明式管理异步加载状态的核心机制。内容系统性地阐述了 <Suspense> 组件的工作原理、激活条件（如 React.lazy, use(Promise)），并详细介绍了利用嵌套 Suspense 实现渐进式加载，以及结合 useTransition 和 useDeferredValue 等并发特性来优化用户体验、避免不必要加载指示器的实践。
Usetransition
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