router.js

import routerga from 'vue-router-ga'

const router = new Router()

routerga(router, 'UA-XXXXX-Y')

vue-router-ga.js

export default function (router, trackID) {
  router.afterEach(to => {
    if (!ga) return
    ga('set', 'page', to.fullPath)
    ga('send', 'pageview')
  })
}