//父组件
<script setup lang="ts">
import Child from './components/Child.vue'

const fnInFather = (msg:any) => {
  console.log("父组件的 fnInFather 函数触发了,拿到了后面的消息====>", msg.value)
}
</script>

<template>
  <div>
    <h2>我是父组件！</h2>
    <Child foo="使用子组件通过 props 传值 !" @change="fnInFather"></Child>
  </div>
</template>

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

//子组件

<script setup lang="ts">
import { ref } from 'vue'
const props = defineProps({
  foo: String,
});

let msg = ref('我是来自子组件的数据666')
const childfn = () => {
  console.log('我是子组件中的事件')
  emit('change', msg)
}
const emit = defineEmits(['change']);
</script>

<template>
  <div>
    我是子组件
    <div>从父组件传过来的 foo : {{ foo }}</div>
    <div @click="childfn" style="cursor: pointer;">点击我触发父组件绑定的 change 事件</div>
  </div>
</template>

<style scoped></style>