①首先安装环境依赖

npm i vue-wechat-title

②在全局配置中引入vue-wechat-title

import VueWechatTitle from 'vue-wechat-title'
createApp(App).use(store).use(router).use(VueWechatTitle).mount('#app')

 ③在router中添加一个meta.title属性

 ④在App.vue添加v-wechat-title属性

<div v-wechat-title="$route.meta.title">
  <router-view/>
</div>

最后，修改成功