vue.js如何将数据传递到根元素

<template>
  <div>
    <child-component :data="myData"></child-component>
  </div>
</template>

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

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      myData: 'Hello Vue.js'
    };
  }
};
</script>

<template>
  <div>
    <button @click="sendData">Send Data</button>
  </div>
</template>

<script>
export default {
  methods: {
    sendData() {
      this.$emit('data-updated', 'Hello Vue.js');
    }
  }
};
</script>

<template>
  <div>
    <child-component @data-updated="handleData"></child-component>
  </div>
</template>

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

export default {
  components: {
    ChildComponent
  },
  methods: {
    handleData(data) {
      console.log(data); // 输出 "Hello Vue.js"
    }
  }
};
</script>