本文介绍了react router 4.0以上的路由应用，分享给大家，具体如下：
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')
);
