使用vue路由器，我如何才能使菜单选择的样式

我正在使用vue路由器创建一个单页应用程序。我有一个导航系统，点击菜单项可以将他们带到相应的页面。例如：

var pageView = require('./components/pageView.vue')
// Define some components
var Boards_page = Vue.extend( {
    template: '<p>Boards</p>'
})
var Fantheories = Vue.extend( {
    template: '<p>Character</p>'
})
// The router needs a root component to render.
// For demo purposes, we will just use an empty one
// because we are using the HTML as the app template.
// !! Note that the App is not a Vue instance.
var App = Vue.extend({})
// Create a router instance.
// You can pass in additional options here, but let's
// keep it simple for now.
var router = new VueRouter({
    history: true
})
// Define some routes.
// Each route should map to a component. The "component" can
// either be an actual component constructor created via
// Vue.extend(), or just a component options object.
// We'll talk about nested routes later.
router.map({
    '/': {
        component: pageView
    },
    '/boards': {
        component: Boards_page
    },
    '/fantheories': {
        component: Fantheories_page
    }
})
// Now we can start the app!
// The router will create an instance of App and mount to
// the element matching the selector #app.
router.start(App, '#container')

我该如何使我在菜单项上的任何URL都有不同的CSS样式，使其看起来像是被选中的？