问反应16.13.1钩子错误`React.useState不是一个函数EN钩子(hook)又称钩子函数，是在一个有序的周期中的某些特殊时刻，系统内部预先设置好的函数，当系统周期到达指定时刻 会自动执行该’钩子’。钩子函数的函数体内容由开发者编写，这绐了幵发者在不同阶段做某些处理的机会。
下一个错误变为:TypeError: (0 , _react.useState) is not a function在我使用 React 挂钩的另一个文件中。 我想解决问题而不是实施解决方法。 我使用microbundle使用 React 捆绑我的库。我使用parcel-bundler导入 React 组件并在开发环境(直接来自 src)或 prod(捆绑库)中呈现它 我使用的捆绑版本与 .mjs 捆绑...
Component.prototype.setState = function (partialState, callback) { (function () { if (!(typeof partialState === 'object' || typeof partialState === 'function' || partialState == null)) { { throw ReactError(Error('setState(...): takes an object of state variables to update or a...
React报错之React hook 'useState' is called conditionally大家都知道hooks是在函数组件的产物。之前class...
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'constuseData=()=>{const[data,setData]=useState({count:0});useEffect(()=>{setTimeout(()=>{se
import {useState,useEffect} from 'react'const useData= () =>{ const [data,setData]= useState({count:0}); useEffect(()=>{ setTimeout(()=>{ setData((data)=>({...data,count:data.count+1})) },1000); },[])return{data}
import React from 'react';//useState是React的方法使用useState方法时要提前引入React依赖包const [state, setState]= React.useState(initalState); 参数 state -> 获取方法,返回的状态 (state) 与默认值 (initalState) 全等 setState -> 设置方法,setState函数用于更新 state。它接收一个新的state值并将组件...
const [name, setName] = useState('Edward'); function handleClick() { setName('Taylor'); setAge(a => a + 1); // ... Parameters nextState: The value that you want the state to be. It can be a value of any type, but there is a special behavior for functions. If you pass ...
functionCounter(){const[count,setCount]=useState(0);functionhandleAlertClick(){setTimeout(()=>{alert('You clicked on: '+count);},3000);}return(<div><p>Youclicked{count}times</p><buttononClick={()=>setCount(count+1)}>Clickme</button><buttononClick={handleAlertClick}>Showalert</button...
The example above uses the arrow function, but you can do it with a traditional function syntax. this.setState(newStateObject, function() { // ... do some other actions }); But what if you’re not usingthis.setState, and you’re usingReact.useState?