{
    path: '/redirect',
    component: Layout,
    hidden: true,
    children: [
      {
        path: '/redirect/:path(.*)',
        component: () => import('@/views/redirect/index')
      }
    ]
  },

{
    path: '/',
    component: Layout,
    redirect: '/dashboard',
    children: [
      {
        path: 'dashboard',
        component: () => import('@/views/dashboard/index'),
        name: 'Dashboard',
        // affix：用于指定当前路由记录是否默认固定显示在 tagsView 上
        meta: { title: 'Dashboard', icon: 'dashboard', affix: true }
      }
    ]
  }

为什么前端中有很多路由配置信息中的component的值为Layout，什么样的路由记录需要这样写？