// father.vue
<child ref="instanceRef" />
this.$ref['instanceRef'].testVal
this.$ref['instanceRef'].testFunc()
// child.vue
data () {
	return {
		testVal: '來自子組件的屬性'
	}
},
methods: {
	testFunc() {
		return '來自子組件的方法'
	}
}

// father.vue
<script setup lang="ts">
import ChildInstance from "@/views/component/father-instance/child-instance.vue";
import { ref } from "vue";

const instanceRef = ref(null);
const getChildInstance = () => {
  const childInstance = instanceRef.value; // 通過ref獲取子組件實例
  console.log(childInstance.childValue);
  console.log(childInstance.childFunc());
};
</script>

<template>
  <ChildInstance ref="instanceRef" />
  <el-button @click="getChildInstance">獲取子組件屬性和方法</el-button>
</template>

<style scoped lang="scss"></style>

// child.vue
<script setup lang="ts">
import { ref, defineExpose } from "vue";

const childValue = ref("來自子組件的屬性");
const childFunc = () => {
  return "來自子組件的方法";
};
// 使用defineExpose指定需要暴露的屬性和方法
defineExpose({
  childValue,
  childFunc
});
</script>

<template>
  <div>來自子組件</div>
</template>

<style scoped lang="scss"></style>