德州做网站公司电话,莱芜哪家企业做网站,免费建立教育网站,徐州吸引力网络科技有限公司文章目录结论#xff08;实战建议#xff09;主要区别- 状态与副作用- 错误边界#xff08;Error Boundary#xff09;- 性能与体积- 可读性与心智模型- 生态与未来最小示例- 函数组件- 类组件错误边界- **怎么选**结论#xff08;实战建议#xff09;
默认用函数组件实战建议主要区别- 状态与副作用- 错误边界Error Boundary- 性能与体积- 可读性与心智模型- 生态与未来最小示例- 函数组件- 类组件错误边界- **怎么选**结论实战建议
默认用函数组件Hooks。更简洁、易组合、类型更友好、生态新能力都在 Hooks。只有当你需要“错误边界”时才考虑类组件目前稳定版仍只有类组件支持。
主要区别
- 状态与副作用
函数组件useState/useEffect/useMemo/useCallback 等 Hooks可组合、无 this。类组件this.state/setState 生命周期方法componentDidMount/Update/WillUnmount。
- 错误边界Error Boundary
仅类组件可稳定实现static getDerivedStateFromError, componentDidCatch。
- 性能与体积
函数组件通常更小、更易优化React.memo、闭包组合。类组件优化依赖 PureComponent/shouldComponentUpdate。
- 可读性与心智模型
函数组件更函数式关注数据流和依赖类组件有 this/绑定等负担。
- 生态与未来
新特性、并发/Suspense 配合、社区最佳实践都以 Hooks 为中心。
最小示例
- 函数组件
function Counter() {const [count, setCount] React.useState(0);return button onClick{() setCount(c c 1)}{count}/button;
}- 类组件错误边界
class ErrorBoundary extends React.Component {state { hasError: false };static getDerivedStateFromError() { return { hasError: true }; }componentDidCatch(err, info) {}render() { return this.state.hasError ? divFallback/div : this.props.children; }
}- 怎么选
日常业务组件函数组件需要错误边界类组件或用现成错误边界包裹
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