现在无法进行渲染了，这是为什么啊

import Vue from 'vue'

import Router from 'vue-router'

import HelloWorld from '@/components/HelloWorld'

import demo1 from '@/pages/demo1/index.vue'

import demo2 from '@/pages/demo2/index.vue'

import demo3 from '@/pages/demo3/index.vue'

import demo4 from '@/pages/demo4/index.vue'

import exercise1 from '@/pages/exercise1/index.vue'

Vue.use(Router)

export default new Router({

  routes: [

    {

      path: '/',

      name: 'HelloWorld',

      component: HelloWorld

    },

    {

      path: '/demo1',

      name: 'HelloWorld',

      component: demo1

    },

    {

      path: '/demo2',

      name: 'dataoption',

      component: demo2

    },

    {

      path: '/exercise1',

      name: 'shijing',

      component: exercise1

    },

    {

      path: '/demo3',

      name: 'model',

      component: demo3

    },

    {

      path: '/demo4',

      name: 'model',

      component: demo4

    }

  ]

})

这个是路由的配置