class R1 extends React.Component{
    render(){
        return <div>1</div>
    }
}

class R2 extends React.Component{
    render(){
        return <div>2</div>
    }
}

class Rts extends React.Component{
    render(){
        return  <div>
            <Route path="/" component={R1}></Route>
            <Route  path="/R" component={R2}></Route>
        </div>  
    }
}



const render = () => {
    ReactDOM.render(
        <Router history={createHistory}>         
            <Rts/>
        </Router>,
        document.querySelector('#app')
    )
}
render();

http://localhost:8080/R 的结果是 Cannot GET /R
我很气啊