vue中显示和隐藏导航

const router = new VueRouter({
  mode: 'history',
  routes: [
    { path: '/first', component: firstView, meta: { navShow: true, cname: '一级页面' }, name: 'first' },
    { path: '/sub', component: subView, meta: { navShow: false, cname: '子页面' }, name: 'sub' },
  ],
});