• 将子组件、孙组件的方法使用defineExpose抛出
• 对子组件、孙组件绑定ref属性
• 通过ref属性对组件中抛出的方法进行调用

父组件

<template>
  <div>
    <Children ref="childrenFn"></Children>
  </div>
</template>
<script lang="ts" setup>
  import Children from './children.vue';
  import { ref, onMounted } from 'vue';

  const childrenFn = ref<any>(null);

  onMounted(() => {
    handleChildren();
  });
  function handleChildren() {
    childrenFn.value.initChildren();
    console.log('此处调用子组件的方法');
  }
</script>

子组件

<template>
  <div>
    <Grandson ref="grandsonFn"></Grandson>
  </div>
</template>
<script setup>
  import Grandson from './grandson.vue';
  import { ref, onMounted } from 'vue';

  const grandsonFn = ref(null);
  function initChildren() {
    grandsonFn.value.initGrandson();
    console.log('此处调用孙组件的方法');
  }
  /**
   * 将子组件的方法暴露出去
   */
  defineExpose({
    initChildren,
  });
</script>
<style lang="scss" scoped></style>

孙组件

<template>
  <div> </div>
</template>
<script setup>
  import { ref, onMounted } from 'vue';

  function initGrandson() {
    console.log('此处是孙组件操作');
  }
  /**
   * 将孙组件的方法暴露出去
   */
  defineExpose({
    initGrandson,
  });
</script>
<style lang="scss" scoped></style>