<router-view></router-view>
<router-view name="left" style="float: left;width: 50%; height: 300px;background-color: #ccc;"></router-view>
<router-view name="right" style="float: left;width: 50%; height: 300px;background-color: #898;"></router-view>

import Vue from 'vue'
import Router from 'vue-router'
import Hello from '@/components/Hello'
import First1 from '@/components/first1'
import First2 from '@/components/first2'

Vue.use(Router)

export default new Router ({
 routes : [
  {
   path : '/',
   name : 'Hello',
   components : {
    default : Hello,
    left : First1,
    right : First2
   }
  }
 ]
})

export default new Router ({
 routes : [
  {
   path : '/',
   name : 'Hello',
   components : {
    default : Hello,
    left : First1,
    right : First2
   }
  }, {
   path : '/first',
   name : 'First',
   components : {
    default : Hello,
    left : First2,
    right : First1
   }   
  }
 ]
})