父子组件

<template>
  <div id="parent">
   <h3>显示子组件</h3>
   <item1></item1>
   <h3>--------------</h3>

   <h3>取当前组件中data的值：</h3>
   <h1>{{ msg }}</h1>

   <h3>1.父组件传值给子组件--------------</h3>
   父组件：<input type="text" v-model="testname"><br/>
   <h3>以下子组件的值，来自于父组件的传入：</h3>
   <child1 :inputName="testname"></child1><br/>

    <h3>2.子组件向父组件传值</h3>
    <h3>childByValue v-on方法监听子组件的状态</h3>
    <child1 v-on:childByValue="childByValue"></child1>
    <h3>子组件传来的值：{{tempChildValue}}</h3>




  </div>

</template>

<script>
  import Item1 from './Item1'
  import Child1 from './Child1'
export default {
  name: 'HelloWorld',
  data () {
    return {
      msg: 'Welcome! this is a Czh Vue.js App',
      testname:'',
      tempChildValue:''
    }
  },
  components: {
    Item1: Item1,
    Child1:Child1,

  },

  methods:{
    childByValue:function (childValue) {
      this.tempChildValue=childValue
    }

  },

  }



</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
h1, h2 {
  font-weight: normal;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>

以下是子组件：

<template>
    <div>
      子组件:<span>{{inputName}}</span><br/><br/>
      <!--定义一个方法，用来向父组件传值-->
      <input type="button" value="点击触发子向父传" @click="childclick"/>
    </div>
</template>

<script>
    export default {
        name: "Child1",

        data () {
          return{
            childValue:"这是子组件的数据"
          }
        },

        // 接受传入的值
        props:{
          inputName:String,
          required:true
        },

        methods:{
          childclick(){
            this.$emit('childByValue',this.childValue)
          },

        },
    }
</script>

<style scoped>

</style>