import { IndexRoute } from 'react-router'

const Dashboard = React.createClass({
 render() {
  return <div>Welcome to the app!</div>
 }
})

React.render((
 <Router>
  <Route path="/" component={App}>
   {/* 当 url 为/时渲染 Dashboard */}
   <IndexRoute component={Dashboard} />
   <Route path="about" component={About} />
   <Route path="inbox" component={Inbox}>
    <Route path="messages/:id" component={Message} />
   </Route>
  </Route>
 </Router>
), document.body)

const routeConfig = [
 { path: '/',
  component: App,
  indexRoute: { component: Dashboard },
  childRoutes: [
   { path: 'about', component: About },
   { path: 'inbox',
    component: Inbox,
    childRoutes: [
     { path: '/messages/:id', component: Message },
     { path: 'messages/:id',
      onEnter: function (nextState, replaceState) {
       //do something
      }
     }
    ]
   }
  ]
 }
]

React.render(<Router routes={routeConfig} />, document.body)

const CourseRoute = {
 path: 'course/:courseId',

 getChildRoutes(location, callback) {
  require.ensure([], function (require) {
   callback(null, [
    require('./routes/Announcements'),
    require('./routes/Assignments'),
    require('./routes/Grades'),
   ])
  })
 },

 getIndexRoute(location, callback) {
  require.ensure([], function (require) {
   callback(null, require('./components/Index'))
  })
 },

 getComponents(location, callback) {
  require.ensure([], function (require) {
   callback(null, require('./components/Course'))
  })
 }
}