Vue ref方式父子组件传值方法

<!doctype html>
<html>
<head>
 <meta charset="UTF-8">
 <script src="https://cdn.bootcss.com/vue/2.3.2/vue.min.js"></script>
</head>
<body>
<div id="box">
 <v-tpl1></v-tpl1>
</div>
<template id="tpl1">
 <div>
  <p>{{msg1}}</p>
  <!--触发拿子组件值的函数-->
  <button @click="getChild">父拿子的值</button>
  <!--通过ref绑定子组件的值-->
  <v-tpl2 ref="shit"></v-tpl2>
 </div>
</template>
<template id="tpl2">
 <p>{{msg2}}</p>
</template>
<script>
 new Vue({
  el: '#box',
  components: {
   'v-tpl1': {
    template: '#tpl1',
    data(){
     return {
      msg1: 'msg1'
     }
    },
    methods: {
     //父组件定义一个方法通过refs拿到子组件的值
     getChild(){
      console.log(this.$refs.shit.msg2)
     }
    },
    components: {
     'v-tpl2': {
      template: '#tpl2',
      data(){
       return {
        msg2: 'msg2'
       }
      }
     }
    }
   }
  }
 })
</script>
</body>
</html>

子拿父的值

<!doctype html>
<html>
<head>
 <meta charset="UTF-8">
 <script src="https://cdn.bootcss.com/vue/2.3.2/vue.min.js"></script>
</head>
<body>
<div id="box">
 <v-tpl1></v-tpl1>
</div>
<template id="tpl1">
 <div>
     <v-tpl2></v-tpl2>
 </div>
</template>
<template id="tpl2">
 <div>
  <button @click="getParent">子拿父的值</button>
  <p>{{msg2}}</p>
 </div>
</template>
<script>
    new Vue({
  el: '#box',
  components: {
   'v-tpl1': {
    template: '#tpl1',
        data(){
     return {
      msg1: 'msg1'
     }
    },
    components: {
         'v-tpl2': {
         template: '#tpl2',
      data(){
       return {
        msg2: 'msg2'
       }
      },
      methods:{
       getParent(){
           console.log(this.$parent.msg1)
       }
      }
     }
    }
   }
  }
 })
</script>
</body>
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