vue3:子组件向父组件发送数据(vue@3.2.26)

一，编写js代码

1，Parent.vue

<template>
  <div>
    <Child @eventParent="receiveMessage"></Child>
  </div>
</template>
 
<script>
import Child from './Child'
export default {
  name: "Parent",
  components: {
     Child,
  },
  setup() {
      //接收消息
      const receiveMessage = (data) => {
           let msg="code:"+data.code+";msg:"+data.msg;
           alert(msg);
      }
 
      return {
        receiveMessage,
      }
  }
}
</script>
 
<style scoped>
 
</style> 

2，Child.vue

<template>
  <div>
    <button @click="sendToParent">向父组件传递消息</button>
  </div>
</template>
 
<script>
export default {
  name: "Child",
  setup (props,{emit}) {
   //向父组件发送消息
    const sendToParent = () => {
         let msg = {
           code:1,
           msg:"这是子组件发送的数据",
         }
         emit('eventParent',msg)
    }
 
    return {
      sendToParent,
    }
  }
}
</script>
 
<style scoped>
 
</style>

说明：刘宏缔的架构森林是一个专注架构的博客，地址：https://www.cnblogs.com/architectforest

         对应的源码可以访问这里获取： https://github.com/liuhongdi/
         或: https://gitee.com/liuhongdi

说明：作者:刘宏缔 邮箱: 371125307@qq.com

二，测试效果：

按钮是子组件的元素，点击后能向父组件发送消息，如图:

 

点击后,父组件收到消息后进行响应：

三，查看vue的版本:

liuhongdi@lhdpc:/data/vue/demo1$ npm list vue
demo1@0.1.0 /data/vue/demo1
├─┬ @vue/cli-plugin-babel@4.5.15
│ └─┬ @vue/babel-preset-app@4.5.15
│   └── vue@3.2.26 deduped
├─┬ element-plus@1.2.0-beta.6
│ ├─┬ @element-plus/icons-vue@0.2.4
│ │ └── vue@3.2.26 deduped
│ ├─┬ @vueuse/core@7.4.1
│ │ ├─┬ @vueuse/shared@7.4.1
│ │ │ └── vue@3.2.26 deduped
│ │ ├─┬ vue-demi@0.12.1
│ │ │ └── vue@3.2.26 deduped
│ │ └── vue@3.2.26 deduped
│ └── vue@3.2.26 deduped
└─┬ vue@3.2.26
  └─┬ @vue/server-renderer@3.2.26
    └── vue@3.2.26 deduped