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});
报错内容 ./src/Containers/device/add/index.tsxLine284:23:ReactHook"useState"is calledinfunction"newDeviceForm"which is neither aReactfunctioncomponent or a customReactHookfunctionreact-hooks/rules-of-hooksSearchforthe keywords to learn more about each error. 解决方案 把报错的组件改写为class或构造函数。
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...
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)=>({...da...
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...
import React, {useState} from 'react'; 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 //...
function Greeting(props) { const isLoggedIn = props.isLoggedIn; if (isLoggedIn) { return <UserGreeting />; } return <GuestGreeting />; } ReactDOM.render( // Try changing to isLoggedIn={true}: <Greeting isLoggedIn={false} />, document.getElementById('root')); 登录状态显示用户信息...
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...
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...
export default function Hooks(props) { //声明一个count变量的state,初始值为数字类型20 let [count, setCount] = useState(20); //声明一个msg变量的state,初始值为字符串的hello hook let [msg, setMsg] = useState('hello hook'); //声明一个list变量的state,初始值为数组类型 ...