在React中,useState 是一个Hook,它必须在React函数组件的顶层调用。从你提供的信息来看,useState 在名为 user 的函数中被调用,但这个函数似乎不是一个React函数组件。以下是对这个问题的详细分析和解决方案: 识别关键信息: React Hook useState。 函数user。 错误提示表明 useState 被调用在一个不是React函数组件的...
React Hook “useState“ is called in function “xxx“ which is neither a React function component or 问题代码import {useState,useEffect} from 'react' const useData = () => { const [data,setData] = useState({count:0}); useEffect(()=>{ setTimeout(()=> { setData((data)=>({...data...
// App.jsimportReact, {useEffect, useState}from'react';// 👇️ Not a component (lowercase first letter)// not a custom hook (doesn't start with use)functioncounter() {const[count, setCount] =useState(0);// ⛔️ React Hook "useEffect" is called in function "counter" that// i...
React Hook “useState“ is called in function “xxx“ which is neither a React function component or 问题代码 AI检测代码解析 import {useState,useEffect} from 'react' const useData = () => { const [data,setData] = useState({count:0}); useEffect(()=>{ setTimeout(()=> { setData((dat...
react-hook-useeffect-called-in-function.png 这里有个示例用来展示错误是如何发生的。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // App.js import React, {useEffect, useState} from 'react'; // 👇️ Not a component (lowercase first letter) // not a custom hook (doesn't start with...
Describe the bug While eslint run on my story fileI get this error: React Hook "useState" is called in function "render" that is neither a React function component nor a custom React Hook function. React component names must start with an uppercase letter. React Hook names must start with...
import React, {useEffect, useState} from 'react'; // 👇️ Not a component (lowercase first letter) // not a custom hook (doesn't start with use) function counter() { const [count, setCount] = useState(0); // ⛔️ React Hook "useEffect" is called in function "counter" that...
const [n, setN] = useState(0)的时候,就不会被直接覆盖掉,所以暂时是成功。为什么说是暂时的呢,因为此时只能使用一个useState。如果使用多个useState的时候,则会导致有很多个全局变量,不好管理。 第三次尝试: 将state记录成数组,并使用index去进行创建和修改 let _state = [] let index = 0 function myUs...
useState是React中最基础的Hook，它允许我们在函数组件中添加状态。useState是React提供的一个内置Hook，...
export default function App() { const [count, setCount] = useState(0); if (count > 0) { return Count is greater than 0; } // ⛔️ React Hook "useState" is called conditionally. //React Hooks must be called in the exact same order // in every...