// 正确用法:仅当依赖项变化时重新计算constfilteredList=useMemo(()=>bigData.filter(item=>item.score>80),[bigData]);// ✅ 避免每次渲染重复计算 3️⃣ 精准控制渲染边界 组件优化技巧对比表 代码语言:jsx AI代码解释 // 最佳实践:Memo + 属性冻结constExpensiveComponent=React.memo(({config})=>{...
static getDerivedStateFromError(error) 代码语言:txt AI代码解释 componentDidCatch(error, info) 这两个新的生命周期函数也是在 React v16 引入的。getDerivedStateFromError()被设计用于捕获 Render Phase 中的异常,会在 Render Phase 调用,因此不希望其中产生副作用,所以也被设计为静态方法。相对的componentDidCatc...
/** * 快捷 FormElement 布局组件 */ export interface FormElementSkeletonProps { classNames?: string; colspan?: number; suppressShowLabel?: boolean; labelRenderer?: () => JSX.Element; contentRenderer: () => JSX.Element; componentType?: ComponentType; } export class FormElementSkeleton extends ...
class ErrorBoundary extends React.Component { constructor(props) { super(props); this.state = { hasError: false }; } static getDerivedStateFromError(error) { // 更新状态以便下一个渲染显示回退UI。 return { hasError: true }; } componentDidCatch(error, errorInfo) { // 将错误详细信息记录到...
First, import useState from React: import { useState } from 'react'; Now you can declare a state variable inside your component: function MyButton() { const [count, setCount] = useState(0); You will get two things from useState: the current state (count), and the function that lets ...
import React, { useState } from 'react'; import ReactQuill from 'react-quill'; import 'react-quill/dist/quill.snow.css'; function MyComponent() { const [value, setValue] = useState(''); return <ReactQuill theme="snow" value={value} onChange={setValue} />; }...
{ msalConfig }from'./authConfig';import'bootstrap/dist/css/bootstrap.min.css';import'./styles/index.css';/** * MSAL should be instantiated outside of the component tree to prevent it from being re-instantiated on re-renders. * For more, visit: https://github.com/AzureAD/microsoft-...
If you use any other ES6+ features that needruntime support(such asArray.from()orSymbol), make sure you are including the appropriate polyfills manually, or that the browsers you are targeting already support them. Also note that using some newer syntax features likefor...ofor[...nonArray...
import{ Suspense }from'react'; /* We've moved data fetching into the changlog compoment */asyncfunctionChangelogWithDataFetching(){constchangelogData =awaitgetChangelogDatareturn<Changelogdata={changelogData}/>} /*...and wrapped that component in Suspense.The user can see the page immediately, ...
(rootEl &&getInstanceFromNode(rootEl));// falseif(hasNonRootReactChild && !isRootRenderedBySomeReact) {// 首次不会走这里error('render(...): Replacing React-rendered children with a new root '+'component. If you intended to update the children of this node, '+'you should instead have ...