Vue动态修改网页标题的方法及遇到问题

<script>
import axios from 'axios'
export default {
 created () {
 document.title = '功能授权'
 },
 mounted() {
 axios.get('***').then((d)=>{
 document.title = '功能授权('+ d.Name + ')'
 })
 }
}
</script>

routes: [{
 path: '/',
 name: 'home',
 component: () => import('@/pages/home/index'),
 meta:{
 keepAlive: true
 }
 },
 {
 path: '/person/auth,
 name: 'personAuth',
 component: () => import('@/pages/person/auth),
 meta:{
 title: '功能授权',
 keepAlive: false
 }
 }
 ]

router.beforeEach((to, from, next) => {
 /* 路由发生变化修改页面title */
 if (to.meta.title) {
 document.title = to.meta.title
 }
})

export default {
 inserted: function (el, binding) {
 const { value } = binding
 if (el.dataset.title) { // 方式1，可以给标签的data-title的属性赋值
 document.title = el.dataset.title
 } else if (value && value.title) { // 方式2，指令传参
 document.title = value.title
 }
 },
 update (el, binding, vnode, oldVnode) {
 const { value } = binding
 if (el.dataset.title) {
 document.title = el.dataset.title
 } else if (value && value.title) {
 document.title = value.title
 }
 }
}

<template>
 <div v-web-title
 :data-title="textTitle">
</template>
<script>
import axios from 'axios'
export default {
 data(){
 return {
 textTitle:'功能授权'
 }
 },
 mounted () {
 axios.get('***').then((d) => {
 this.textTitle = '功能授权(' + d.Name + ')'
 })
 }
}
</script>

<template>
 <div v-web-title="{title:textTitle}">
</template>
<script>
import axios from 'axios'
export default {
 data(){
 return {
 textTitle:'功能授权'
 }
 },
 mounted () {
 axios.get('***').then((d) => {
 this.textTitle = '功能授权(' + d.Name + ')'
 })
 }
}
</script>