react-router4 map循环出的可以切换路由地址，但是切换不了组件

Question

<ul className="nav">
    <li>
        <Link to="/section1">test1</Link>
    </li>
    <li>
        <Link to="/section2">test2</Link>
    </li>
    <li>
        <Link to="/section3">test3</Link>
    </li>
    //上边直接写正常
    ////////////////////////////////////////
    //下边就不行，地址可以切换，组件出不来，也切换不了
    {list.map((item, index) => {
        return <li key={index}>
            <Router>
                <Link to={`/section${index + 1}`}>{item}</Link>
            </Router>
            </li>
        })}
</ul>

{this.props.children}

<Switch>
    <Route path="/section1" component={Section1}/>1
    <Route path="/section2" component={Section2}/>2
    <Route path="/section3" component={Section3}/>3
</Switch>

Answer 1

{list.map((item, index) => {
    return <li key={index}> 
            <Link to={`/section${index + 1}`}>{item}</Link>
        </li>
    })}

因为我嵌套了2层<Router>去掉就可以了...