import Vue from 'vue'
import Router from 'vue-router'
import Home from '@/components/home'
import Items from '@/components/Items'
import Waterfull from '@/components/Waterfull'

Vue.use(Router)

const router = new Router({
  mode: 'history',
  routes: [
    {
      path: '/',
      name: 'home',
      alias
 
: '/home',
      meta: {
        title: '首頁'
      },
      component: Home
    },
    {
      path: '/items',
      name: 'Items',
      meta: {
        title: 'web專案'
      },
      component: Items
    },
    {
      path: '/items/Waterfull',
      name: 'Waterfull',
      meta: {
        title: '瀑布流'
 

      },
      component: Waterfull
    }
  ]
})

router.beforeEach(function(to,from,next){
    if(to.meta.title){
        document.title = to.meta.title
    }else{
        document.title = 'personal learn'
    }
    next()
})

export default router

主要通過

router.beforeEach(function(to,from,next){
    if
 
(to.meta.title){
        document.title = to.meta.title
    }else{
        document.title = 'personal learn'
    }
    next()
})

進行修改；