functionApp(){const[subreddit,setSubreddit]=useState('reactjs');constinputRef=useRef();consthandleSubmit=(event)=>{event.preventDefault();setSubreddit(inputRef.current.value);}return(<Redditsubreddit={subreddit}/>)} 对input输入写内容,回车,Reddit标题已经修改了,但是数据列表还是旧的。 因为在Reddit...
waitForElement不再从'@testing-library/react'中提供。文档 另一种方法是: import { act, render } from '@testing-library/react'; it('is a test definition', async () => { // notice the async await act(async () => { // this is kind of ugly, but it works. render(<TheComponent />...
Move it inside the useEffect callback. Alternatively, wrap the 'fetchApi' definition into its own useCallback() Hook. (react-hooks/exhaustive-deps)所以第二个问题为: 如果useEffect的依赖数组存在函数, 该如何理解这个函数是否"变化"? 例如上面例子里面, 为什么会造成无限循环, 函数到底是哪里"变化"了导致...
'off', 'no-void': [ 'error', { allowAsStatement: true, }, ], "react/function-component-definition": [ 2, { "namedComponents": "arrow-function" } ] }, settings: { 'import/resolver': { node: { paths: ['src'], extensions: ['.js', '.jsx', '.ts', '.tsx'] }, }, },...
问React:如何在第一次渲染时跳过useEffectEN从React Hooks发布以来，整个社区都以积极的态度去拥抱它、...
Just to be clear here,useRefdoesinvalidate the component and cause a re-render when the ref is bound by react, correct? (If not, I suppose it could be used in conjunction withuseStateand aProxy, similarly to@thebuilder's callback-based workaround above.) ...
EN在我的React应用程序中，我有一个redux存储，它包含弹出状态，具有以下模型：在实际运行时，大多数情况...
Line 12: React Hook useEffect has a missing dependency: 'getTags'. Either include it or remove the dependency array. If 'getTags' changes too often, find the parent component that defines it and wrap that definition in useCallback react-hooks/exhaustive-deps ...
问在第一次加载和后续更新时响应useEffect以具有不同的行为ENExport、Import底层原理是MR，不适合太大量的...
@jsamr I think that's what you want: function useEffect(fn, whatDeps, whenDeps) { const cb = React.useMemo(() => fn, whatDeps); React.useEffect(() => { cb(); }, whenDeps); } Not sure what's the use case for this is 👎 1 Contributor bvaughn commented Sep 11, 2020 ...