When rendering and testing a component with auseEffectthat calls an async function that modifies the component's state, then anact()console error will be output when running tests. @testing-library/reactversion:
setErr] =useState('');useEffect(()=>{// 👇️ this only runs onceconsole.log('useEffect ran');// 👇️ fetch data from remote APIasyncfunctiongetUsers(){try{constresponse =awaitfetch('https://www.jiyik.com/api/users', {method:'GET',headers: {Accept:...
在我的代码中,我尝试将字体加载和登录用户检测结合起来,但使用 useCallback 和 useEffect 会触发过度渲染错误。 // App.js // All imports are correct SplashScreen.preventAutoHideAsync(); export default function App() { // Loading fonts const [fontsLoaded, fontError] = useFonts({ "SF-Pro-Display...
Therefore, to use async/await inside the useEffect hook, you can do either of the following: Create a Self-Invoking Anonymous Function; Create a Nested Named Function.This post was published 4 years ago by Daniyal Hamid. Daniyal currently works as the Head of Engineering in Germany and has ...
javascript 为什么useCallback函数会在useEffect中导致无限循环？如果queryForProject函数应该只运行一次，下面...
import{useState,useEffect}from"react";constBASE_URL="https://corona.lmao.ninja/v2";exportfunctionuseCoronaAPI(path,{initialData=null,converter=(data)=>data,refetchInterval=null}){const[data,setData]=useState(initialData);useEffect(()=>{constfetchData=async()=>{constresponse=awaitfetch(`${BASE...
testing this async code. Also, you must be careful if you are using async callings inside the useEffect hook. I was concerned about this but I was doing it wrong in some parts. I'll share with you what I'm doing with my code now, which thanks to the tests and the library, I ...
useEffect的回调函数会在第一次渲染时调用，并且每当依赖数组中的某个变量发生变化时都会调用。通常情况下...
Fetch the repository and log the output in the App function by replacing the useEffect Hook with the following code directly above the return statement: Copy 1 2 3 4 useEffect(async () => { const repo = await invoke("fetchRepository"); console.log(`Repository full name: ${repo.full_...
function Quiz() { async () => { <> )对于我的应用程序的初始负载,fetchData在我的useEffect()中被调用了两次我有点困惑,因为我认为useCallback()会阻止这种情况(即使StrictMode< 浏览3提问于2022-06-03得票数 1 1回答 即使在使用UseEffect时,组件挂载也会调用两次useCallback。 、、 我是这样在useCallbac...