在Vue.js 3中挂载时，有没有办法从父组件访问子方法？

import { ref } from 'vue';

export default {
  methods: {
    childMethod() {
      // 子组件的方法逻辑
    }
  },
  setup() {
    const childMethodRef = ref(null);
    childMethodRef.value = childMethod;

    return {
      childMethodRef
    };
  }
};

import { toRef } from 'vue';

export default {
  mounted() {
    const childComponent = this.$refs.childComponent;
    const childMethodRef = toRef(childComponent, 'childMethodRef');
    const childMethod = childMethodRef.value;

    // 通过childMethod调用子组件的方法
    childMethod();
  }
};