黑豹程序员-vue3 setup 子组件给父组件传值

工作原理

在子组件中调用emit方法触发父组件的方法实现传值

父组件 p.vue

<template>
  <div>
    <ChildComponent @childValue="handleChildValue"></ChildComponent>
    <button @click="getChildValue">获取子组件的值</button>
    {{receivedChildValue}}
  </div>
</template>

<script setup>
import { ref } from 'vue';
import ChildComponent from './child.vue';

const receivedChildValue = ref('');

const handleChildValue = (value) => {
  receivedChildValue.value = value;
};

const getChildValue = () => {
  console.log('Child Value:', receivedChildValue.value);
};
</script>

子组件：child.vue

<template>
  <div>
    <p>子组件的值: {{ childValue }}</p>
  </div>
</template>

<script setup>
import { ref, getCurrentInstance } from 'vue';

const childValue = ref('czs');
const instance = getCurrentInstance();

//子组件发生值给父组件，通过childValue事件触发
instance.emit('childValue', childValue.value);

</script>