Vue组件通信：使用事件监听器进行数据传递

<template>
  <div>
    <child-component v-on:childEvent="handleChildEvent"></child-component>
    <p>从子组件接收到的数据：{{ receivedData }}</p>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      receivedData: ''
    };
  },
  methods: {
    handleChildEvent(data) {
      this.receivedData = data;
    }
  }
};
</script>

<template>
  <div>
    <button @click="triggerEvent">触发事件</button>
  </div>
</template>

<script>
export default {
  methods: {
    triggerEvent() {
      this.$emit('childEvent', 'Hello, Vue!');
    }
  }
};
</script>

<!-- 父组件 -->
<template>
  <div>
    <child-component></child-component>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue';

export default {
  components: {
    ChildComponent
  },
  mounted() {
    this.$emit('parentEvent', 'Hello, Vue!');
  }
};
</script>

<!-- 子组件 -->
<template>
  <div>
    <p>从父组件接收到的数据：{{ receivedData }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      receivedData: ''
    };
  },
  mounted() {
    this.$parent.$on('parentEvent', this.handleParentEvent);
  },
  methods: {
    handleParentEvent(data) {
      this.receivedData = data;
    }
  }
};
</script>