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// 子组件 childB
 
<template>
    <div id="childB">
        <h1>我是B组件</h1>
        <button @click="transform">点我让A组件接收到数据</button>
        <p>因为你点了A，所以我的信息发生了变化：{{AMessage}}</p>
    </div>
</template>
 
<script>
    export default {
        data() {
            return {
                BMessage: 'Hello，A组件，我是B组件'
            }
        },
        computed: {
            AMessage() {
                // 这里存储从store里获取的A组件的数据
                return this.$store.state.AMsg
            }
        },
        methods: {
            transform() {
                // 触发receiveBMsg，将B组件的数据存放到store里去
                this.$store.commit('receiveBMsg', {
                    BMsg: this.BMessage
                })
            }
        }
    }
</script>