实现非父子之间通信，兄弟组件之间的数据传递--eventBus

const install = function (Vue) {
    const Bus = new Vue({
        methods: {
            emit (event, ...args) {
                this.$emit(event, ...args);
            },
            on (event, callback) {
                this.$on(event, callback);
            },
            off (event, callback) {
                this.$off(event, callback);
            }
        }
    });
    Vue.prototype.$bus = Bus;
};

export default install;

import VueBus from ‘./vue-bus‘
Vue.use(VueBus)

<template>
    <div>
        {{ number }}
        <button @click="handleAddRandom">随机增加</button>
    </div>
</template>
<script>
    export default {
        props: {
            number: {
                type: Number
            }
        },
        methods: {
            handleAddRandom () {
                // 随机获取 1-100 中的数
                const num = Math.floor(Math.random () * 100 + 1);
                this.$bus.emit(‘add‘, num);
            }
        }
    };
</script>

<template>
    <div>
        <h1>首页</h1>
        随机增加：
        <Counter :number="number"></Counter>
    </div>
</template>
<script>
    import Counter from ‘./counter.vue‘;
    export default {
        components: {
            Counter
        },
        data () {
            return {
                number: 0
            }
        },
        methods: {
        handleAddRandom (num) {
                this.number += num;
            }
    },
        created () {
            this.$bus.on(‘add‘, this.handleAddRandom);
        },
        beforeDestroy () {
            this.$bus.off(‘add‘, this.handleAddRandom);
        }
    }
</script>