react skillA
react is agent-read markdown (skill) from yuecao365/offercome: React 怎么面：调和与 Hooks、状态与数据获取、重渲染、Next.js。JD 点名 React 时读。.
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What the file says
## 面试官在意什么 React 方向前端的日常是用组件与 Hooks 组织业务界面、管理服务器数据与本地状态、控制重渲染、在 Next.js 或自建 SSR 上做首屏与 SEO、写测试保证重构安全。真实面试里 React 题的分水岭非常清晰：背过文档的人能说出 useEffect 的依赖数组规则，但说不出为什么自己的页面会闪烁两次、为什么列表一滚动就掉帧、为什么 Server Component 里不能用 useState。面试官最在意三件事：一是对 React 渲染模型的真实理解（什么触发渲染、渲染与提交的区别、为什么 state 是快照），二是有没有排查过真实的性能与状态问题（重渲染归因、竞态、缓存失效），三是对 React 生态的选型判断（数据获取库、状态库、Next.js 的 App Router 与 Pages Router、RSC 的边界）。 校招侧重 Hooks 规则、虚拟 DOM 与 diff、受控组件、常见 Hook 的手写与闭包陷阱；社招侧重 Concurrent 特性的实际用法、RSC 与 Server Actions 的架构影响、大型应用的状态分层、性能归因工具链、测试策略与迁移经验。一线大厂与外企现在常给一段有问题的组件代码让候选人现场找 bug 与优化，或者给一个页面需求让候选人口述组件划分与数据流。 怎么问才像这个方向的面试官： - 先问现象再问原理：从"页面闪烁两次""输入框内容错位""旧 state"这类真实 bug 切入，能背文档但没写过的人在这里会露馅。 - 每个优化手段都追"怎么测的、数字多少、什么时候不该用"，尤其是 memo 类优化，追问"你有没有因为过度优化回退过"。 - Next.js 与 RSC 题结合候选人实际用的路由模式与部署方式出，没用过 App Router 的不强考 RSC 细节，但要考 SSR 与 hydration 的通用理解。 - 不考 API 时效：不问"React 19 新增了哪些 Hook"这类记忆题，考的是渲染模型、状态设计与工程判断；浏览器与构建通用题交给 parent 包 frontend。 - 2026 年 React 面试的分水岭是 React 19：Server Components 与 Actions（useActionState、useOptimistic、use）、ref 作为 prop、React Compiler 的自动记忆化。面试官会追"哪些组件该在服务端、Actions 怎么接管 pending 与错误、编译器让你删掉了哪些手写 memo"；只会讲 useEffect 依赖数组的按过时处理。 ## 项目 / 实习怎么深挖 …
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Source
yuecao365/offercome · 23 stars · license MIT · pushed 2026-09-23 · branch main
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