react + dva 2.1

Question

react+dva2.1版本的，怎么做前端路由拦截器呢

function RouterConfig({ history, app }) {
const routes = [

{
  path: '/user',
  models: () => [import('./models/user')],
  component: () => import('./routes/index'),
},
{
  path: '/auth/login',
  models: () => [import('./models/auth')],
  component: () => import('./routes/auth/Login'),
},

]

return (

<ConnectedRouter history={history}>
  <App>
    <Switch>
      <Route exact path="/" render={() => (<Redirect to="/index" />)} />
      {
        routes.map(({ path, ...dynamics }, key) => (
          <Route key={key}
                 exact
                 path={path}
                 component={dynamic({
                   app,
                   ...dynamics,
                 })}
          />
        ))
      }
    </Switch>
  </App>
</ConnectedRouter>

)