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                <div id="app">
  <div class = "row">
    <div class = "col-sm-12 text-center">
    <select class = "form-control" v-model="$i18n.locale">
      <option value = "en">en</option>
      <option value = "ja">ja</option>
  <div class = "row pt-5">
    <div class = "col-sm-12 text-center">
      <h3>{{ $t("message.hello") }}</h3>





                // If using a module system (e.g. via vue-cli), import Vue and VueI18n and then call Vue.use(VueI18n).
// import Vue from 'vue'
// import VueI18n from 'vue-i18n'
// Vue.use(VueI18n)

// Ready translated locale messages
const messages = {
  en: {
    message: {
      hello: 'hello world'
  ja: {
    message: {
      hello: 'こんにちは、世界'

// Create VueI18n instance with options
const i18n = new VueI18n({
  locale: 'ja', // set locale
  messages, // set locale messages

// Create a Vue instance with `i18n` option
new Vue({
// Now the app has started!