组件间通信-provide-inject（祖孙通信）
父组件：

<template>
  <div class="father">
    <h3>父组件</h3>
    <h4>银子：{{ money }}万元</h4>
    <h4>车子：一辆{{car.brand}}车，价值{{car.price}}万元</h4>
    <Child/>
  </div>
</template>
<script setup lang="ts" name="Father">
  import Child from './Child.vue'
  import {ref,reactive,provide} from 'vue'
  let money = ref(100)
  let car = reactive({
    brand:'奔驰',
    price:100
  })
  function updateMoney(value:number){
    money.value -= value
  }
  // 向后代提供数据
  provide('moneyContext',{money,updateMoney})
  provide('car',car)
</script>
<style scoped>
  .father {
    background-color: rgb(165, 164, 164);
    padding: 20px;
    border-radius: 10px;
  }
</style>

子组件：

<template>
  <div class="child">
    <h3>我是子组件</h3>
    <GrandChild/>
  </div>
</template>
<script setup lang="ts" name="Child">
  import GrandChild from './GrandChild.vue'
</script>
<style scoped>
  .child {
    margin-top: 20px;
    background-color: skyblue;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px black;
  }
</style>

孙组件：

<template>
  <div class="grand-child">
    <h3>我是孙组件</h3>
    <h4>银子：{{ money }}</h4>
    <h4>车子：一辆{{car.brand}}车，价值{{car.price}}万元</h4>
    <button @click="updateMoney(6)">花爷爷的钱</button>
  </div>
</template>
<script setup lang="ts" name="GrandChild">
  import { inject } from "vue";
  let {money,updateMoney} = inject('moneyContext',{money:0,updateMoney:(param:number)=>{}})
  let car = inject('car',{brand:'未知',price:0})
</script>
<style scoped>
  .grand-child{
    background-color: orange;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px black;
  }
</style>