useWhyDidYouUpdate 会保存好上一次传入的 props,然后和新传入的 props 进行比较,找出不同的属性,将它们打印到控制台。 我们来看个示例: import { useWhyDidYouUpdate } from 'ahooks'; import { useState } from 'react'; function Counter(props) { useWhyDidYouUpdate('Counter', props); return ( {...
React.memo是一个高阶组件。类似于React.PureComponent,但是这个用于函数组件而非类组件。 如果你的函数组件每次使用相同的props来渲染相同的结果,那么你应该使用React.memo来封装它,这样就可以通过记忆一些样例的结果来提高性能。意味着 React 将跳过渲染组件,而是重用最后的渲染结果。 默认情况下之后浅比较 props 对象里...
functionDecoration(){return(⛵️);}exportdefaultReact.memo(Decoration); By wrapping ourDecorationcomponent withReact.memo, we're telling React “Hey, Iknowthat this component is pure. You don't need to re-render it unless its props change.” This uses a technique known asmemoization...
React is a JavaScript library. It is not a framework. It is not a complete solution and we will often need to use more libraries with React to form any solution. React does not assume anything about the other parts in any solution. It focuses on just one thing and on doing that thing...
Hooks are a feature introduced in React 16.8 that enable developers to use state and lifecycle features in functional components, rather than relying on class components. The most commonly used hooks are useState and useEffect. Example: importReact,{useState,useEffect}from'react';functionExample(){co...
I have a small React app with a component that has a button that opens a small menu, and I'd like it to close the menu when the user clicks anywhere outside the component. function setupDocumentClickEffect(onClick = (() => {})) { console.log('Add doc click'...
Do you want to learn about the react useCallback() hook? Learn how to use it to write efficient React code. Here’s a simple and easy-to-follow guide for you.
export default function TopNav() { const classes = useStyles(); const [cartOpen, setCartOpen] = useState(false); const checkoutBtnRef = useRef("null"); useEffect(() => { console.log(checkoutBtnRef.current); }, [cartOpen]); return ( <> <Container maxWidth="xl"> <...
import { Link } from "react-router-dom" import "../styles/Header.css" import PathConstants from "../routes/pathConstants"; export default function Header() { return ( <Link to={PathConstants.HOME}>My React App</Link> <Link to={PathConstants.TEAM}>Team</Link> <Link to={Path...
We will discuss about it later, but before, let’s see when to use React-virtualized. When When thinking about performance, lots of actions can be taken, but React official website already got a complete article to be read. In consequence, if you face a performance problem, be sure you...