vue.js3:父组件子组件互相访问数据方法(vue@3.2.37)

<template>
  <div style="background: #ffff00;">
  <div>这是子组件</div>
    <div>参数default:{{defaultStr}},参数top:{{topStr}}</div>
    <div>变量:{{childName}}</div>
    <button @click="childAlert">子组件alert</button><br/>
    <button @click="sendFatherData">子组件向父组件发送数据</button><br/><br/>
  </div>
</template>

<script>
import {ref} from 'vue';
export default {
  name: "ChildComp",
  props:['default','top'],  //属性，用来接收参数
  setup(props,{emit}) {
    //本身的一个方法，响应点击
    const childAlert = () => {
        alert('这是子组件中的alert');
    }
    
    //接收到父组件调用时的参数
    const defaultStr = ref(props.default);
    const topStr = ref(props.top);

    //定义变量
    const childName = ref('红孩儿');

    //向父组件发送数据
    const sendFatherData = () => {
      emit('eventMsg','寻找牛魔王');
    }

    return {
      childAlert,
      defaultStr,
      topStr,
      childName,
      sendFatherData,
    }
  }
}
</script>

<style scoped>

</style>

<template>
<div>
  <div>这是父组件</div>
  <child ref="child" default="cn" top="jp,us,uk" @eventMsg="childCall"></child>
  <button @click="callChildMethod">父组件调用子组件的方法</button><br/>
  <button @click="callChildData">父组件访问子组件的数据</button>
</div>
</template>

<script>
import {ref} from 'vue'
import Child from './Child.vue'
export default {
  name: "FatherComp",
  components:{
    Child,
  },
  setup() {
    // 获取子组件
    const child = ref(null)
    //调用子组件中的方法
    const callChildMethod = () => {
      child.value.childAlert();
    }
    //访问子组件中的数据
    const callChildData = () => {
      alert("子组件中的变量:childName:"+child.value.childName);
    }
    
    //接收子组件发送的数据
    const childCall = (childData) => {
      alert("子组件传过来的参数:"+childData);
    }

    return {
      callChildMethod,
      callChildData,
      child,
      childCall,
    }
  }
}
</script>

<style scoped>

</style>

liuhongdi@lhdpc:/data/vue/child$ npm list vue
child@0.1.0 /data/vue/child
├─┬ @vue/cli-plugin-babel@5.0.6
│ └─┬ @vue/babel-preset-app@5.0.6
│   └── vue@3.2.37 deduped
└─┬ vue@3.2.37
  └─┬ @vue/server-renderer@3.2.37
    └── vue@3.2.37 deduped