function App() {
  return (
    <div className="App">
        <div>
          <NavLink to="/home">点我去home</NavLink>
          <NavLink to="/phone">点我去phone</NavLink>
          <NavLink to="/User">点我去User</NavLink>
        </div>
    <Switch>
    
      <Route path="/home" component={Home}/>
      <Route path="/phone" component={Phone}/>
      <Route path="/User" component={User}/>
      <Route path="/User" component={User}/>
      <Redirect from="/" to="/home/homea" exact/>
      </Switch>
    </div>
  );
}
export default App;