Vue.js组件间通信方式总结【推荐】

// 父组件 ParentComponent
<template>
 <div class="parent-component">
 <h2>这是一个父组件</h2>
 <ChildComponent :parentMessage="parentMessage"/>
 </div>
</template>
<script>
 import ChildComponent from './ChildComponent'
 export default {
 name: "ParentComponent",
 data(){
  return{
  parentMessage:'这是来自父组件的数据'
  }
 },
 components:{
  ChildComponent
 }
 }
</script>
// 子组件 ChildComponent
<template>
<div class="child-component">
 <h2>这是一个子组件</h2>
 <h3>{{parentMessage}}</h3>
</div>
</template>
<script>
 export default {
 name: "ChildComponent",
 props:["parentMessage"]
 }
</script>

// ParentComponent 父组件
<template>
 <div class="parent-component">
 <h2>这是一个父组件total:{{total}}</h2>
 <ChildComponent :parentMessage="parentMessage" :total="total" @handleAdd10="getTotal"/>
 </div>
</template>
<script>
 import ChildComponent from './ChildComponent'
 export default {
 name: "ParentComponent",
 data(){
  return{
  parentMessage:'这是来自父组件的数据',
  total:10,
  }
 },
 components:{
  ChildComponent
 },
 methods:{
  getTotal(total){
  this.total=total;
  console.log('ParentComponent total:',total);
  }
 }
 }
</script>
// ChildComponent 子组件
<template>
<div class="child-component">
 <h2>这是一个子组件</h2>
 <h3>{{parentMessage}}</h3>
 <button @click="handleAdd10">+10按钮</button>
</div>
</template>
<script>
 export default {
 name: "ChildComponent",
 props:["parentMessage","total"],
 methods:{
  handleAdd10(){
  let total=this.total+10;
  console.log('ChildComponent $emit:');
  this.$emit('handleAdd10',total);
  }
 }
 }
</script>

// ParentComponent 改动如下
**
<h2>这是一个父组件total:{{total}}</h2>
<ChildComponent :parentMessage="parentMessage" :total="total" @handleAdd10="getTotal"/>
<InputComponent v-model="total"/>
**
<script>
import InputComponent from './InputComponent'
</script>
**
// InputComponent 子组件
<template>
 <input type="text" @input="updateValue($event)">
</template>
<script>
 export default {
 name: "InputComponent",
 methods:{
  updateValue(evt){
  this.$emit('input',evt.target.value)
  }
 }
 }
</script>

// ParentComponent 父组件
<template>
 <div class="parent-component">
 {{message}}
 <br>
 <br>
 <component-a/>
 </div>
</template>

<script>
 import Vue from 'vue'
 let bus=new Vue();
 export default {
 name: "ParentComponent",
 data(){
  return{
  message:'',
  }
 },
 components:{
  componentA:{
  template:'<button @click="handleClick">传递事件</button>',
  methods:{
   handleClick(){
   bus.$emit('on-message','来自子组件component-a的内容')
   }
  }
  }
 },
 mounted(){
  bus.$on('on-message',(msg)=>{
  this.message=msg;
  });
 }
 }
</script>