web250825/vue3/project5/src/views/Custom/Child.vue

<template>
  <div>
    child
    <button @click="emit('once1',part1)"> 
      给父亲100元
    </button>
    <button @click="emit('vase',part2)"> 
      给父亲花
    </button>
  </div>
</template>

<script setup>
import {ref} from "vue" 
import { defineEmits } from "vue"
let part1 = ref(50)
let part2 = ref(10)
// defineProps defineEmits 两者运行时 或者 使用时声明类型
// 如果同时声明 则编译报错
const emit = defineEmits(['once1','vase']);
console.log(emit)
</script>

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