Vue3和uniapp开发微信小程序在main.js中引入自定义TabBar，在App.vue中引入，组件显示不出来,也不报错

import App from './App'  
import { createSSRApp } from 'vue'  
import { createPinia } from 'pinia';  
import './static/commonScss/common.scss';  
import './static/styles/style.scss';  
import './request/httpInterceptors';  
// 导入全局组件  
import CustomTabBar from './components/CustomTabBar/CustomTabBar.vue';  

export function createApp() {  
  const app = createSSRApp(App)  
  const pinia = createPinia();  
  app.use(pinia);  

  // 注册全局组件  
  app.component('CustomTabBar', CustomTabBar);  

  return {  
    app  
  }  
}  
//App.vue  
<template>  
    <view class="app">  
        <router-view />  
        <CustomTabBar />  
    </view>  
</template>