发现vue-cli脚手架新出了个3.0里面有多页配置项，对文档来试着配置，可以访问每个页面，但是发现刷新时，对应页面的路由都找不到，代码如下

// vue.config.js
module.exports = {
  baseUrl: process.env.NODE_ENV === 'production'
    ? '/ems/'
    : '/ems/',
  pages: {
    admin: {
      entry: 'src/views/admin/main.js',
      template: 'public/admin.html',
      filename: 'admin/index.html',
    },
    school: {
      entry: 'src/views/school/main.js',
      template: 'public/school.html',
      filename: 'school/index.html',
    }
  }  
}

// admin.routes.js
import Vue from 'vue'
import Router from 'vue-router'
import Home from '@/views/admin/Home.vue'
import Layout from '@/components/layout-admin'

Vue.use(Router)

const routes = [
  {
    path: '/',
    redirect: {name: 'admin'},
  },
  {
    path: '/admin',
    name: 'admin',
    component: Layout,
    redirect: {name: 'home'},
    children: [
      {
        path: 'home',
        name: 'home',
        component: Home
      },
      {
        path: 'about',
        name: 'about',
        component: () => import('./../views/admin/About.vue')
      }
    ]
  }  
]

export default new Router({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

当通过访问 /ems/admin路由来访问 /ems/admin/home是可以的，但是直接访问 /ems/admin/home是访问不到的，有哪位指导下为啥？