1. 父组件向子组件传值（props）

• 父组件代码：Parent.vue

  <template><div><h2>父组件</h2><Child :parent-msg="parentMsg" /></div>
  </template><script>
  import Child from './Child.vue';export default {components: {Child},data() {return {parentMsg: '这是父组件传递的消息'};}
  };
  </script>

• 子组件代码：Child.vue

  <template><div><h3>子组件</h3><p>从父组件接收到的消息：{{ parentMsg }}</p></div>
  </template><script>
  export default {props: {parentMsg: {type: String,required: true}}
  };
  </script>

  2. 子组件向父组件传值（this.$emit）

• 子组件代码：Child.vue

  <template><div><h3>子组件</h3><button @click="sendMessage">向父组件发送消息</button></div>
  </template><script>
  export default {data() {return {childMsg: '这是子组件的消息'};},methods: {sendMessage() {this.$emit('sendMessage', this.childMsg);}}
  };
  <