Vue中混入的作用是分发组建中可复用的功能
新建mixins文件夹，新建mixins.ts文件

import { ref } from 'vue';

export default function () {
  const num = ref(0);
  const fav = ref(false);
  const fvbtn = () => {
    num.value += 1;
    fav.value = true;
    setTimeout(() => {
      fav.value = false;
    }, 3000);
  };
  return {
    num,
    fav,
    fvbtn,
  };
}

在文件中引用

<!--
 * @Author: wangyf 1758985226@qq.com
 * @Date: 2023-07-04 17:32:24
 * @LastEditors: wangyf 1758985226@qq.com
 * @LastEditTime: 2023-07-05 08:57:17
 * @FilePath: \fast-vue3\src\pages\mixinsVue\index.vue
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
-->
<template>
  <div>
    <h1>混入</h1>
    {{ num }}<br />
    <button @click="fvbtn">
      {{ fav ? '收藏中...' : '收藏' }}
    </button>
    <hr />
    <A />
  </div>
</template>

<script setup>
  import A from './A.vue';
  import mixin from '../mixins/mixins.ts';
  const { num, fav, fvbtn } = mixin();
</script>

<style></style>

注意：二者的函数复用，但是数据不共享