react-router

import React from 'react'
import ReactDOM from 'react-dom'
import { HashRouter as Router, Route, Link, Switch } from 'react-router-dom'


class Wrapper extends React.Component{
    constructor(props) {
        super(props);
    }
    render() {
        return <div>
            <Link to="/a">组件A</Link>
            <br/>
            <Link to="/a/123">带参数的组件A</Link>
            <br/>
            <Link to="/a/sub">/a/sub</Link>
            <br/>
            <Link to="/b">组件B</Link>
        {this.props.children}</div>
    }
}
class A extends React.Component{
    constructor (props) {
        super(props);
    }
    render() {
        return (
            <div>
                Component A
                参数是： {this.props.match.params.id}
                <Switch>
                    <Route exact path={`${this.props.match.path}`}
                        render={ (route) => {
                            return <div>当前组件是bu带参数的A}</div>
                    }} />
                    <Route exact path={`${this.props.match.path}/sub`}
                        render={ (route) => {
                            return <div>当前组件是sub</div>
                    }} />
                    <Route path={`${this.props.match.path}/:id`}
                        render={ (route) => {
                            return <div>当前组件是带参数的A，参数是{route.match.params.id}</div>
                    }} />
                </Switch>
            </div>
        )
    }
}
class B extends React.Component{
    constructor (props) {
        super(props);
    }
    render() {
        return <div> Component B</div>
    }
}

ReactDOM.render(
    <Router>
        <Wrapper>
            <Route path="/a" component={A} />
            <Route path="/b" component={B} />
        </Wrapper>
    </Router>,
  document.getElementById('app')
);