Vue3中使用setup通过ref获取子组件的属性

<template>
  <div class="test-com">testCom</div>
</template>

<script setup lang="ts">
import { ref } from 'vue'
const testText = ref('我是子组件的数据')
defineExpose({
  text: testText
})
</script>

<template>
  <div>
    <TestCom ref="getTestComRef" />
    {{ showText }}
  </div>
</template>

<script lang="ts" setup>
import { nextTick, ref } from 'vue'
import TestCom from './components/TestCom.vue'
const getTestComRef = ref<{
  text: string
}>()
const showText = ref()
nextTick(() => {
  showText.value = getTestComRef.value?.text
})
</script>

<template>
  <son ref="sonRef"></son>
</template>

<script setup>
import { onMounted, ref } from "vue";
import Son from "./view/son.vue";
const sonRef = ref(null);
onMounted(() => {
  console.log(sonRef.value);
});
</script>

<template>
  <div>子组件</div>
</template>

<script setup>
const a = "555";
const fn = () => {
  console.log("执行了fn");
};
</script>

<template>
  <div>子组件</div>
</template>

<script setup>
const a = "555";
const fn = () => {
  console.log("执行了fn");
};
defineExpose({
  a,
  fn,
});
</script>