functionProfilePage(props){constshowMessage=()=>{alert('Followed '+props.user);};consthandleClick=()=>{setTimeout(showMessage,3000);};return(Follow);} 没有bug 是因为,作为函数式组件,ProfilePage本质只是一个普通的函数。当user改变时,React 传入新的props重新执行了这个函数。但在上次函数执行过程中声...
不知道大家有沒有类似的经验,在一个已经 Render 很完整的一個页面,点了一个按钮跳页面后,那瞬间回到一个 Loading 状态,数据来了后东西才又显示出來,这中间花的时间有长有短,短得有的甚至就是一個闪烁。 以官方提供的范例来说,原本好好的 Home Page 一但切到 Profile Page,原本的画面就不见了,剩下一個大...
在App.js组件中使用: import React from 'react'; import { BrowserRouter, Routes, Route } from 'react-router-dom'; import Profile from './pages/Profile'; import SignIn from './pages/SignIn'; import { useSelector } from 'react-redux'; import { Navigate } from 'react-router-dom'; fun...
所以当你点击的时候,弹出的内容就是那一刻的props.user变量。 function ProfilePage(props) { const showMessage = () => { alert('Followed ' + props.user); }; const handleClick = () => { setTimeout(showMessage, 3000); }; return ( Follow );} 复制代码 使用hooks 状态逻辑复用 在使用 Class...
props 会在 ProfilePage 函数执行的一瞬间就被捕获,而 props 本身又是一个不可变值,因此我们可以充分确保从现在开始,在任何时机下读取到的 props,都是最初捕获到的那个 props。当父组件传入新的 props 来尝试重新渲染 ProfilePage 时,本质上是基于新的 props 入参发起了一次全新的函数调用,并不会影响上一次调用...
{pathname:'/profile',search:'',hash:'',state:null,key:'default'} 咱们新建一个测试i文件 __tests__/react/route/route-location.test.tsx importProfilefrom"src/page/profile/profile";import{MemoryRouter,Routes,Route}from"react-router-dom";import{screen,render}from"@testing-library/react";describe...
The isomorphic approach attempts to fix this problem by pre-rendering the requested URL of a single page application on the server. With Node.js, you have JavaScript on the server, meaning React can also run server-side. This shouldn’t be too hard, right? One obstacle is that some Flux...
React version: V18.0.0 React router DOM: V5.2.1 Steps To Reproduce Going to profile page Warning: Internal React error: Expected static flag was missing. Please notify the React team. Link to code example: DynamicFilter.js component The ...
|-- PageLayout.jsx |-- ProfileData.jsx |-- SignInButton.jsx |-- SignOutButton.jsx |-- WelcomeName.jsx | |-- pages/ |-- Home.jsx |-- Profile.jsx | |-- styles/ |-- theme.js | |-- App.js | |-- index.js |-- .gitignore ...
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