<template><div>{{ num }}___{{ fav }}</div><button @click="favBtn">改变值</button>
</template><script setup lang="ts">
import mixin from "../mixins/mixin";
let { num, fav, favBtn } = mixin();
defineExpose({ num, fav, favBtn });
</script><style></style>

../mixins/mixin.ts:

import { ref } from "vue";
export default function() {let num = ref(1);let fav = ref(false);let favBtn = () => {num.value += 1;fav.value = true;setTimeout(() => {fav.value = false;}, 2000)}return {num,fav,favBtn}
}

效果图：