AI代码解释 importReactfrom'react';importReactDOMfrom'react-dom';import{BrowserRouter,Route}from"react-router-dom";classBarextendsReact.Component{componentDidMount(){console.log("componentDidMount")}render(){return(Bar)}}classAppextendsReact.Component{constructor(prop){super(prop);this.state={idx:1}...
import{Router}from"react-router";import{createHashHistory,createBrowserHistory}from"history";classHashRouterextendsReact.Component{history=createHashHistory(this.props);render(){return<Routerhistory={this.history}children={this.props.children}/>;}}classBrowserRouterextendsReact.Component{history=createBrowser...
<Route path='/' component={App} /> <Route path='/Home' component={Home} /> <Route path='/About' component={About} /> //这种情况下,如果点击Home,匹配路由path='/Home',那么会把App也会展示出来。 <Route exact path='/' component={App} /> <Route path='/Home' component={Home} /...
而且是卸载现有组件以及挂载你设置的新组件,但是上述写法使用了箭头函数,导致只要路由这段代码render执行一次,即便路由地址没发生变化,component都会认定这是一个新组件,从而每次都完整执行生命周期钩子,那写在didMount中的请求自然每次都会请求。
React Router 4 把Route当作普通的React组件,可以在任意组件内使用Route,而不再像之前的版本那样,必须在一个地方集中定义所有的Route。因此,使用React Router 4 的项目中,经常会有Route和其他组件出现在同一个组件内的情况。例如下面这段代码: class App extends Component { ...
React 最初路由的原理是通过动态的给组件状态设置值显示或者隐藏组件来实现: class App extends React.Component { state = { screen: 'list' // or about } render() { return( <div className='…
import {BrowserRouter, Route} from "react-router-dom"; class Bar extends React.Component { componentDidMount() { console.log("componentDidMount") } render() { return ( Bar ) } } class App extends React.Component { constructor(prop
export default class Login extends Component { state = { user: null, } render() { const { Header, Content, Footer } = Layout const NormalLoginForm = () => { const onFinish = async (values) => { //请求登陆 const { username, password } = values ...
3.3 实现异步加载方法asyncComponent import React from 'react'; export const asyncComponent = loadComponent => ( class AsyncComponent extends React.Component { constructor(...args){ super(...args); this.state = { Component: null, }; this.hasLoadedComponent = this.hasLoadedComponent.bind(this);...
<Route path="/about" component={About}/></Router> 上面代码中,用户访问/repos(比如http://localhost:8080/#/repos)时,加载Repos组件;访问/about(http://localhost:8080/#/about)时,加载About组件。 二、嵌套路由 Route组件还可以嵌套。 <Router history={hashHistory}><Route path="/"component={App}><...