<template>
 <div>
  <input type="text" v-model="msg">
  <br>
  //将子控件属性inputValue与父组件msg属性绑定
  <child :inputValue="msg"></child>
 </div>
</template>
<style>

</style>
<script>
 export default{
  data(){
   return {
    msg: '请输入'
   }
  },
  components: {
   child: require('./Child.vue')
  }
 }
</script>

<template>
 <div>
  <p>{{inputValue}}</p>
 </div>
</template>
<style>

</style>
<script>
  export default{
    props: {
     inputValue: String
    }
  }
</script>

<template>
 <div>
//message为子控件上绑定的通知；recieveMessage为父组件监听到后的方法
  <child2 v-on:message="recieveMessage"></child2>
 </div>
</template>
<script>
 import {Toast} from 'mint-ui'
 export default{
  components: {
   child2: require('./Child2.vue'),
   Toast
  },
  methods: {
   recieveMessage: function (text) {
    Toast('监听到子组件变化'+text);
   }
  }
 }
</script>

<template>
 <div>
  <input type="text" v-model="msg" @change="onInput">
 </div>
</template>
<script>
 export default{
  data(){
   return {
    msg: '请输入值'
   }
  },
  methods: {
   onInput: function () {
    if (this.msg.trim()) {
     this.$emit('message', this.msg);
    }
   }
  }
 }
</script>