把test里的内容传送到test2

//test1.vue
<template>

    <div>test1
        <Teleport v-if="flag" to=".aa">
            test1的内容
        </Teleport>
    </div>

</template>

<script setup lang='ts'>
    import { ref,reactive,onMounted } from 'vue'
    const flag = ref(false)

    onMounted(()=>{
        flag.value = true
    })

</script>
<style scoped lang='scss'>

</style>

//test2.vue
<template>

    <div>test2:<span class="aa"></span></div>

</template>

<script setup lang='ts'>
    // import { ref,reactive } from 'vue'

</script>
<style scoped lang='scss'>

</style>

//app.vue
  import Test1 from './components/test1.vue';
  import Test2 from './components/test2.vue';


<template>

  <div id = 'app'>
    <Test1></Test1>
    <Test2></Test2>
  </div>
  
</template>

注意！！

一定要用v-if控制Teleport 组件，确保它在onMounted加载完成之后传送。如果不加会报错：
Note the target element must exist before the component is mounted
Invalid Teleport target on mount: null