我仍然不明白为什么它会改变，它应该总是有相同的值从鼻涕虫。当它改变useEffect将确保imgSrc总是正确的...
functiongetNumber(){return0;}exportdefaultfunctionuseStateExample(){const[number,setNumber]=useState(getNumber); The getNumber function could be anything, it could pick a random number, retrieve the number from a database, any source. Updating Arrays ...
我认为，要有效地停止您的计时器，您应该将Ref.current = id;设置为null。尝试在启动计时器时将Ref.c...
useEffect, useState 와 같은 훅이나 데이터 페칭 라이브러리 없이 async/await 만으로도 데이터 페칭을 해결할 수 있다. 서버 컴포넌트는 서버에서 실행되기 때문에,데이터 접근, 로직과 같...
When the query string is not present in the URL, the default behaviour is to return null as state.As you saw in the previous example, it makes state updating and UI rendering tedious.You can specify a default value to be returned in this case:...
1.让所有东西都在一次使用中运行效果（一次，在装载时）1.坚持使用async/await语法
[workoutData, setWorkoutData] = useState(initialState) const [user, setUser] = useState<any>(null) const { title, loads, reps } = workoutData useEffect(() => { // Fetch the current session and set the user const fetchUser = async () => { const { data: { session }, } = ...
const[initialized,setInitialized]=React.useState(false); Bind theonScannedevent. Stop scanning and display the barcode results if barcodes are found. JSX: <BarcodeScanneronInitialized={()=>setInitialized(true)}isActive={isActive}onScanned={(results)=>onScanned(results)}></BarcodeScanner> ...
useState(""); const handleSubmit = async (e: any) => { e.preventDefault(); e.productImage = imageData; }; return ( UploadThing File Upload! Lorem ipsum is placeholder text. <
const [newItem, setNewItem] = useState<string>(''); const fetchItems = async () => { try { const data = await fetch('/api/fetch'); const res = await data.json(); setItems(res.data); } catch (error) { console.log(error); ...