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useEffect() is used to introduce operations with "side effects", such as AJAX request, DOM operation, start and end countdown, monitoring and contact events, which can be done on the useEffect hook. So, is it really so simple that it can be used directly? No, you may encounter a trap, which is the infinite loop of component rendering. ...

Test Hooks' proficiencyWhy can't Hooks be used in for loops and if statementsReact.memo,React.useCallback,React. The role and comparison of usememoThe value in useState is an object. If you change the value in the object, will the component render? If you use react It's wrapped in memo()What is the (Implementation) principle of Hooks?What is th ...

This is a personal note, not a tutorial. It is recommended to read the original text. Although it is longer, it is still very advantageous to try it two or three times. If you have problems, you can communicate with each other. Original address: https://overreacted.io/zh-hans/a-complete-guide-to-useeffect/ Author profile: https://overreacte ...

Strongly recommend this react hooks tutorial: https://github.com/puxiao/react-hook-tutorial react hooks What is react hooks? (1). Hook is a new feature / syntax added to React 16.8.0 (2). You can use state and other React features in function components ​ Three commonly used hooks (1). State Hook: React.useState() (2). Effect Hook: Re ...

Webpack flowchart Important steps: init => run => compile => compilation => make => afterCompile => seal => codeGen => emit => done   plugin idea The idea of plugin plug-in is to find a place to insert between the above steps. The method inserted and called uses the event model, hooks: // Define an event / ...

In the React component, we will execute the method in useEffect() and return a function to eliminate its side effects. The following is a scenario in our business. This custom Hooks is used to call the interface to update data every 2s.import { useState, useEffect } from 'react'; export function useFetchDataInterval(fetchData) { const [list, ...

brief introduction React 16.8 was officially released on February 2019. It is a feature that can improve code quality and development efficiency. The author will first list some practical points for further discussion. However, it should be understood that there is no perfect best practice specification. For an efficient team, stable specific ...

1. What problem is hook used to solve In a word, Hook is used to make us better reuse React state logic code. Note that this is not a template code, which can be reused with components; The simple state logic code can not be reused with components Some students may say that ordinary functions can realize logical code reuse? The answer is: ...