web250825/vue3/project5/src/views/Attrs/GrandSon.vue

<template>
  <div>孙
    <h3>祖父给了我{{ carNum }}辆车</h3>
    <button @click="addCar(10)">增加</button>
  </div>
</template>

<script lang="ts" setup>
import {ref,reactive} from "vue" 
defineProps(['carNum','addCar'])
</script>

<style lang="scss" scoped>
</style>