// 自己使用

<div v-for="item in ['lisi','wanger']" :key="item">

  <test :ref="(el) => setGraphRef(el, item)" />

</div>

    const setGraphRef = (el, type) => {

      if (el) {

        itemRefs[type] = el;

      }

    };

// 调用

  const targetRef = itemRefs[item];

   if (targetRef) targetRef.testa();

// 官方的例子

<div v-for="item in list" :ref="setItemRef"></div>

import { onBeforeUpdate, onUpdated } from "vue";

export default {

  setup() {

    let itemRefs = [];

    const setItemRef = (el) => {

      if (el) {

        itemRefs.push(el);

      }

    };

    onBeforeUpdate(() => {

      itemRefs = [];

    });

    onUpdated(() => {

      console.log(itemRefs);

    });

    return {

      setItemRef,

    };

  },

};