React Hooks 是一组允许你在函数组件中添加状态和其他 React 功能的函数。重要的是,Hooks 只能在函数组件或自定义 Hook 函数内部调用。这意味着你不能在类组件或顶层(全局作用域)代码中调用 Hooks。 2. 指出问题中的错误用法:在顶层调用useState 在你的问题中,你提到在顶层调用了 useState。这是不正确的用法,因为...
React Hook "useA" cannot be called inside a callback. React Hooks must be called in a React function component or a custom React Hook function 报错信息 我自己写的代码: 此函数想要放到Button中的onClick中,而onClick里需要的是一个回调? 再看官网,人家写了 https://zh-hans.reactjs.org/docs/ho...
React Hook “useState” is called in function “example” which is neither a React function component or a custom React Hook function react-hooks/rules-of-hooks 问题描述: 引入 React 中的 u... 查看原文 React Hooks ,随着输入框内容的改变,组件内部的label 标签显示的内容也同时改变。下面是两种不同...
1.eslint去掉注释报错:// eslint-disable-next-line react-hooks/rules-of-hooks 在使用reacthook时会遇到一些问题,就是在使用hook的一些api时就会出现如下所示报错,使用vscode的自动修复就是加上注释,但是每用一次就加一次注释非常麻烦 问题是:使用组件和props编译报错 错误信息如下 React Hook "useEffect" is cal...
component or a custom React Hook function.const[count, setCount] =useState(0);// ⛔️ React Hook "useEffect" cannot be called in a class component.// React Hooks must be called in a React function component or a custom React Hook function.useEffect(() =>{console.log('hello world')...
Names of custom hooks must start withfor React to recognize your function as a custom hook. I wrotea bookin which I share everything I know about how to become a better, more efficient programmer. You can use the search field on myHome Pageto filter through all of my articles. ...
React Hook "useState" cannot be called in a class component. // React Hooks must be called in a React function component or a custom React Hook function. const [count, setCount] = useState(0); // React Hook "useEffect" cannot be called in a class component. // React Hooks must be ...
Learn how to fix the "React Hooks Must Be Called In a React Function Component or a Custom React Hook Function" error with our guide.
To use local storage in React, we can construct a custom Hook. The Hook allows you to preserve data in the browser as key-value pairs for later use. import { useState } from "react"; export default function App() { // Usage const [name, setName] = useLocalStorage("name", "John"...
import { useState, useEffect, useRef }from'react'export function useFocus() {constinputRef =useRef() useEffect(()=>{ inputRef.current.focus() }, [])returninputRef } Test: import Reactfrom'react'import { render }from'@testing-library/react'import'@testing-library/jest-dom/extend-expect'imp...