为所有实例设置组件属性/将相同的数据传递给所有组件实例

<!-- 父组件 -->
<template>
  <div>
    <child-component :data="sharedData"></child-component>
    <child-component :data="sharedData"></child-component>
    <child-component :data="sharedData"></child-component>
  </div>
</template>

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

export default {
  components: {
    ChildComponent
  },
  data() {
    return {
      sharedData: '共享的数据'
    };
  }
};
</script>

<!-- 子组件 ChildComponent.vue -->
<template>
  <div>
    <p>{{ data }}</p>
  </div>
</template>

<script>
export default {
  props: ['data']
};
</script>