Vue2父子组件间的通信

父组件：
<div>
    <div style="background:#34495E;color: #fff; padding:20px">
      <p style="margin-bottom: 20px">这是父组件</p>
      <div style="background:#E74C3C;color: #fff; padding:20px; margin-top:20px">
        <p>接受来自子组件的内容: </p>
        <p style="margin-top:20px;background:#fff; color:#000; padding:5px; line-height:1.5;">{{hello}}</p>
      </div>
    </div>
    <div style="background:#34495E;color: #fff; padding:20px; margin-top:20px">
      <p style="margin-bottom: 20px">这是子组件</p>
      <musicsearch @trans="transContent" :pupu="hello" :info="info"></musicsearch>
    </div>
  </div>
export default {
  components: {
    musicsearch
  },
  data() {
    return {
      hello: ‘‘,
      info: ‘‘
    }
  },
  methods: {
    transContent(msgs) {
      this.hello = msgs;
      this.info = msgs;
    }
  }
}

子组件：
<div>
    <div style="margin-top:20px; background:#E74C3C; padding:10px;">
      <input type="text" ref="ipt" style="border:none; margin-top:10px; margin-bottom: 20px; border-radius:4px; width:90%; height:18px; padding:5px; line-height:18px; border:1px solid #fff">
      <button @click="sendVal()" style="margin-bottom: 20px; border:none; outline:none; border-radius:4px; height:28px; line-height:28px; background:#F1C40F; color:#fff;">向父组件发送内容按钮</button>
    </div>
    <div style="margin-top:20px; background:#E74C3C; padding:10px;">
      <button @click="click()" style=" margin-top:10px; border:none; outline:none; border-radius:4px; height:28px; line-height:28px; background:#F1C40F; color:#fff;">接受来自父组件的内容按钮</button>
      <div style="margin-top:20px;background:#fff; color:#000; padding:5px; line-height:1.5;">{{msg}}</div>
    </div>
  </div>

export default {
  name: ‘girl-group‘,
  props: {
    info: ‘‘
  },
  data() {
    return {
      msg: ‘‘
    }
  },
  methods: {
    sendVal() {
      this.$emit(‘trans‘, this.$refs.ipt.value)；
　　　　//这里在父组件使用v-on来监听子组件上的自定义事件($emit的变化),一旦发生变化click方法里的值就会跟着改变，调用click事件可看到信息
    },
    click() {
      this.msg = this.info;
    }
  }
}