How to use vue.js to realize $refs and $emit parent-child component interaction

This article mainly introduces the interaction method between vue.js $refs and $emit parent-child components. Now I share it with you and give it a reference.

This article introduces the interaction method between vue.js $refs and $emit parent-child components. I would like to share it with you. Without further ado, just look at the code:

<strong>父调子 $refs （把父组件的数据传给子组件） </strong><br><br><template>
 <p id="app">
  <input type="button" name="" id="" @click="parentCall" value="父调子" />
  <hello ref="chil" />//hello组件
 </p>
</template>
<script>
 import hello from &#39;./components/Hello&#39;
 export default {
  name: &#39;app&#39;,
  &#39;components&#39;: {
   hello
  },
  methods: {
　　  parentCall () {
　　　　  this.$refs.chil.chilFn(&#39;我是父元素传过来的&#39;)
　　  }
  }
 }
</script>
/*Hello.vue :*/
<template>
 <p class="hello"></p>
</template>
<script>
 export default {
  name: &#39;hello&#39;,
  &#39;methods&#39;: {
　　  chilFn (msg) {
　　　　  alert(msg)
　　  }
  }
 }
</script>

<strong>子调父 $emit (把子组件的数据传给父组件)</strong>
//ps:App.vue 父组件
//Hello.vue 子组件
<!--App.vue :-->
<template>
　　<p id="app">
　　　　<hello @newNodeEvent="parentLisen" />
　　</p>
</template>
<script>
 import hello from &#39;./components/Hello&#39;
 export default {
  name: &#39;app&#39;,
  &#39;components&#39;: {
   hello
  },
  methods: {
   parentLisen(evtValue) { 
    //evtValue 是子组件传过来的值
    alert(evtValue)
   }
  }
 }
</script>
<!--Hello.vue :-->
<template>
　　<p class="hello">
　　　　<input type="button" name="" id="" @click="chilCall()" value="子调父" /> 
　　</p>
</template>
<script>
 export default {
  name: &#39;hello&#39;,
  &#39;methods&#39;: {
   chilCall(pars) {
    this.$emit(&#39;newNodeEvent&#39;, &#39;我是子元素传过来的&#39;)
   }
  }
 }
</script>

The above is what I compiled for you. I hope it will be helpful to everyone in the future.

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