<Switch>
<Route exact path="/login" component={Login}/>
<Route path="/home" component={Home}>
<Route path="/model" component={Model}/>
<Route path="/result" component={Result}/>
</Route>
<Redirect from="/" to="/home" />
</Switch>
改为
<Switch>
<Route exact path="/login" component={Login}/>
<Home>
<Route path="/model" component={Model}/>
<Route path="/result" component={Result}/>
</Home>
<Redirect from="/" to="/home" />
</Switch>
