Vue:如何与parent中的特定子组件通信

<template>
  <div>
    <child-component :message="message" @customEvent="handleEvent"></child-component>
  </div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      message: 'Hello from parent!'
    };
  },
  methods: {
    handleEvent(data) {
      console.log(data);
    }
  }
}
</script>

<template>
  <div>
    <p>{{ message }}</p>
    <button @click="sendEvent">Send Event to Parent</button>
  </div>
</template>
<script>
export default {
  props: ['message'],
  methods: {
    sendEvent() {
      this.$emit('customEvent', 'Custom event data');
    }
  }
}
</script>

<template>
  <div>
    <child-component ref="child"></child-component>
    <button @click="callChildMethod">Call Child Method</button>
  </div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  methods: {
    callChildMethod() {
      this.$refs.child.childMethod();
    }
  }
}
</script>

<template>
  <div>
    <p>{{ message }}</p>
  </div>
</template>
<script>
export default {
  data() {
    return {
      message: 'Hello from child!'
    };
  },
  methods: {
    childMethod() {
      console.log('Child method called');
    }
  }
}
</script>