App.vue

<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
import defaultSetting from './settings'
export default {
  name: 'App',
  mounted() {
      let divTemp = document.createElement("title");
      divTemp.innerHTML = defaultSetting.title;
      document.querySelector("head").appendChild(divTemp)
  },
}
</script>