父组件Index.vue:

<script setup>
import { onMounted, provide, ref } from 'vue'
import Child from './Child.vue'
import './index.css'

const count = ref(0)

provide('count', count)

const handleClick = () => {
  count.value++
}

onMounted(() => {})
</script>

<template>
  <div class="m-home-wrap">
    <button @click="() => handleClick()">{{ count }}</button>
    <Child>
    </Child>
    <div class="m-home-demo"></div>
  </div>
</template>

<style></style>

子组件Child.vue:

<script setup>
import { onMounted, ref } from 'vue'
import List from './List.vue'

onMounted(() => {})
</script>

<template>
  <List></List>
</template>

孙子组件List.vue:

<script setup>
import { onMounted, ref, inject } from 'vue'

const count = inject('count')

onMounted(() => {})
</script>

<template>
  <div>孙子组件：{{ count }}</div>
</template>

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