1 useUpdate how do I force a component to refresh in a react function component? Although react does not provide a native method, we know that when the state value changes, the react function component will be refreshed, so useUpdate takes advantage of this. The source code is as follows: import { useCallback, useState } from 'react'; const useUpdate = () => { const [, setState] = useState({}); return useCallback(() => setState({}), []); }; export default useUpdate; you can see the return value function of useUpdate, which calls setState with a new object each time, triggering the update of the component. 2 useMount although the react function component does not have the life cycle of mount, we still have this requirement, that is, the requirement of executing once after the component is rendered for the first time can be encapsulated by useEffect. If you only need to set the dependency to an empty array, then you can only perform a callback after the rendering is completed: import { useEffect } from 'react'; const useMount = (fn: () => void) => { useEffect(() => { fn?.(); }, []); }; export default useMount; 3 useLatest react function component is an interruptible, repeatable function, so every time there is a change in state or props, the function will be re-executed. We know that the scope of the function is fixed when the function is created. If the internal function is not updated, then the external variables obtained by these functions will not change. For example: import React, { useState, useEffect } from 'react';…

During the development of a project, designers will inevitably create animated effects to enhance the user experience. If the current effect does not require interaction and is only for display, we can use GIF or APNG to achieve the effect. but if the current animation requires other interactions in addition to presentation, or even a component requires animation effects, it would be unreasonable to use a picture format. So I wrote an extremely simple css animation library rc-css-animate . Here we directly use animate.css as the dependent library for css animation. Animate.css not only provides many interactive animation style classes, but also provides animation running speed, latency, and the number of repetitions and other style classes. as you can see, the default animate.css build animation needs to carry the prefix "animate__". <h1 class="animate__animated animate__bounce">An animated element</h1> of course, the library encapsulates css animation and still supports other animation libraries as well as their own handwritten css animation, but this library is not recommended if developers need to control all kinds of complex animation. use can be used in the following ways: import React, { useRef } from "react"; import ReactCssAnimate from "rc-css-animate"; // introduce animate.css as an animation dependency import "animate.css"; function App() { const animateRef = useRef(null); return ( <div className="App"> <ReactCssAnimate // Define the components that currently display the animation // Use by default div tag="div" // Of the current component className className="" // Of the current component style style={{}} // Of the current component ref ref={animateRef} // Animation prefix clsPrefix="animate__" // Of the current animation className animateCls="animated…