// showNum.vue 中接收事件

<template>
	<div>计算和: {{count}}</div>
</template>

<script>
	import {EventBus} from './EventBus.js'
	export default {
		data() {
			return {
				count: 0
			}
		},

		mounted() {
			EventBus.$on('addition', param => {
				this.count = this.count + param.num;
			})
		}
	}
</script>