vue 兄弟组件的信息传递的方法实例详解

import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
export const store=new Vuex.Store({
 state:{
  msgFromA:'A 还没说话',
  msgFromB:'B 还没说话'
 },
 getters:{
 },
 mutations:{
  msgAChange(state,msg){
   state.msgFromA=msg;
  },
  msgBChange(state,msg){
   state.msgFromB=msg;
  },
 }
})

<template>
 <div class="a">
  <h3>A 模块</h3>
  <p>B 说：{{msgFromB}}</p>
  <button @click="aSay">A 把自己的信息传给B</button>
 </div>
</template>

<script>
 export default {
  data () {
   return {
    msg:'我是A',
   }
  },
  methods:{
   aSay(){
    this.$store.commit('msgAChange', this.msg);
   }
  },
  computed: {
   msgFromB() {
    return this.$store.state.msgFromB;
   }
  }
 }
</script>

<template>
 <div class="b">
  <h3>B 模块</h3>
  <p>A 说：{{msgFromA}}</p>
  <button @click="bSay">B 把自己的信息传给A</button>
 </div>
</template>

<script>
 export default {
  data () {
   return {
    msg:'我是B'
   }
  },
  methods:{
   bSay(){
    this.$store.commit('msgBChange', this.msg);
   }
  },
  computed: {
   msgFromA() {
    return this.$store.state.msgFromA;
   }
  }
 }
</script>

import Vue from 'vue'
export default new Vue();

<template>
 <div class="a">
  <h3>A 模块</h3>
  <p>B 说：{{msgFromB}}</p>
  <button @click="aSay">A 把自己的信息传给B</button>
 </div>
</template>

<script>
 import Bus from '../util/Bus'
 export default {
  data () {
   return {
    msg:'我是A',
    msgFromB:'B 还没说话',
   }
  },
  created(){
   let _this=this;
   Bus.$on('msgBChange',function(dt){
    _this.msgFromB=dt;
   })
  },
  methods:{
   aSay(){
    Bus.$emit('msgAChange',this.msg);
   }
  }
 }
</script>

<template>
 <div class="b">
  <h3>B 模块</h3>
  <p>A 说：{{msgFromA}}</p>
  <button @click="bSay">B 把自己的信息传给A</button>
 </div>
</template>

<script>
 import Bus from '../util/Bus'
 export default {
  data () {
   return {
    msg:'我是B',
    msgFromA:'A 还没说话'
   }
  },
  created(){
   let _this=this;
   Bus.$on('msgAChange',function(dt){
    _this.msgFromA=dt;
   })
  },
  methods:{
   bSay(){
    Bus.$emit('msgBChange',this.msg);
   }
  }
 }
</script>

<template>
 <div class="c">
  <h3>事件链传递数据</h3>
  <appA :msg-from-b="msgFromB" v-on:msg-a-change="aSay"></appA>
  <appB :msg-from-a="msgFromA" v-on:msg-b-change="bSay"></appB>
 </div>
</template>

<script>
 import A from '../a3/A'
 import B from '../b3/B'
 export default {
  data () {
   return {
    msgFromA:'A 还没说话',
    msgFromB:'B 还没说话'
   }
  },
  methods:{
   aSay(msg){
    this.msgFromA=msg;
   },
   bSay(msg){
    this.msgFromB=msg;
   },
  },
  components:{
   appA:A,
   appB:B,
  }
 }
</script>

<template>
 <div class="a">
  <h3>A 模块</h3>
  <p>B 说：{{msgFromB}}</p>
  <button @click="aSay">A 把自己的信息传给B</button>
 </div>
</template>

<script>
 export default {
  data () {
   return {
    msg:'我是A',
   }
  },
  methods:{
   aSay(){
    this.$emit('msg-a-change', this.msg)
   }
  },
  props: ['msgFromB'],
 }
</script>

<template>
 <div class="b">
  <h3>B 模块</h3>
  <p>A 说：{{msgFromA}}</p>
  <button @click="bSay">B 把自己的信息传给A</button>
 </div>
</template>

<script>
 import Bus from '../util/Bus'
 export default {
  data () {
   return {
    msg:'我是B',
   }
  },
  methods:{
   bSay(){
    this.$emit('msg-b-change', this.msg)
   }
  },
  props: ['msgFromA'],
 }
</script>