react router 4.0以上的路由应用

在4.0以下的react router中，嵌套的路由可以放在一个router标签中，形式如下,嵌套的路由也直接放在一起。

<Route component={App}>    <Route path="groups" components={Groups} />    <Route path="users" components={Users}>      <Route path="users/:userId" component={Profile} />    </Route></Route>

但是在4.0以后，嵌套的路由与之前的就完全不同了，需要单独放置在嵌套的根component中去处理路由，否则会一直有warning:

You should not use <Route component> and <Route children> in the same route

正确形式如下

<Route component={App}>    <Route path="groups" components={Groups} />    <Route path="users" components={Users}>      //<Route path="users/:userId" component={Profile} />    </Route></Route>

上面将嵌套的路由注释掉

const Users = ({ match }) => (  <div>    <h2>Topics</h2>    <Route path={`${match.url}/:userId`} component={Profile}/>  </div>) 

上面在需要嵌套路由的component中添加新的路由

一个完整的嵌套路由的例子如下

说明及注意事项

1. 以下代码采用ES6格式
2. react-router-dom版本为4.1.1
3. 请注意使用诸如HashRouter之类的history，否则一直会有warning，不能渲染

import React, { Component } from ‘react‘;import ReactDOM from ‘react-dom‘;// import { Router, Route, Link, Switch } from ‘react-router‘;import {  HashRouter,  Route,  Link,  Switch} from ‘react-router-dom‘;class App extends Component {  render() {    return (      <div>        <h1>App</h1>        <ul>          <li><Link to="/">Home</Link></li>          <li><Link to="/about">About</Link></li>          <li><Link to="/inbox">Inbox</Link></li>        </ul>        {this.props.children}      </div>    );  }}const About = () => (  <div>    <h3>About</h3>  </div>)const Home = () => (  <div>    <h3>Home</h3>  </div>)const Message = ({ match }) => (  <div>    <h3>new messages</h3>    <h3>{match.params.id}</h3>  </div>)const Inbox = ({ match }) => (  <div>    <h2>Topics</h2>    <Route path={`${match.url}/messages/:id`} component={Message}/>  </div>) ReactDOM.render(  (<HashRouter>    <App>        <Route exact path="/" component={Home} />        <Route path="/about" component={About} />        <Route path="/inbox" component={Inbox} />    </App>  </HashRouter>),  document.getElementById(‘root‘));

参考

• https://stackoverflow.com/questions/42845834/why-can-i-not-nest-route-components-in-react-router-4-x

• https://code.tutsplus.com/tutorials/understanding-nested-routing-in-react–cms-27955

react router 4.0以上的路由应用