Vue中 事件总线（eventBus）详解及使用

插件方式：

npm install vue-bus --save

// main.js
import Vue from 'vue';
import VueBus from 'vue-bus';
Vue.use(VueBus);
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// A 组件
<template>
  <div class="wrap">
    <button @click="sendMsg">触发</button>
  </div>
</template>

<script>
export default {
  data(){
    return {
      Amsg:'我是来自A组件的信息',
    }
  },
  methods:{
    sendMsg(){
      this.$bus.emit('changeMsg', this.Amsg );
      this.$bus.emit('doOnce','我只会触发一次');
    }
  },
}
</script>
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// B 组件
<template>
  <div>
    <h3>{{Bmsg}}</h3>
  </div>
</template>

<script>
export default {
  data(){
    return {
      Bmsg:'我是B组件',
    }
  },
  methods:{
    getMsg(msg){
      this.Bmsg = msg;
      console.log(msg);
    }
  },
  created(){
    /*
    * 接收事件
    * 这种写法也体现了：A 组件调用 B 组件中的方法。如果只是传递数据，可参考如下简化写法：
    * this.$bus.on('changeMsg', (msg) => { this.Bmsg = msg });
	*/ 
    this.$bus.on('changeMsg', this.getMsg);
    // 此侦听器只会触发一次
    this.$bus.once('doOnce', (txt) => { console.log(txt) });
  },
  // 组件销毁时，移除EventBus事件监听
  beforeDestroy() {
    this.$bus.off('changeMsg', this.getMsg);
  },
}
</script>
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不用插件方式：

//main.js
import Vue from 'vue'
import App from './App'
import router from './router'
 
Vue.config.productionTip = false
Vue.prototype.bus = new Vue()    //此处全局注册一个Vue作为事件中心
/* eslint-disable no-new */
new Vue({
  el: '#app',
  router,
  components: { App },
  template: '<App/>'
}
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<template>
  <div class="hello" style="border:1px solid #666">
    <h1>Brother1 component</h1>
    <h2 @click="send">click send onb2</h2>
  </div>
</template>
<script>
export default {
  name: 'Brother1',
  data () {
    return {
      msg: 'Brother1'
    }
  },
  methods: {
    send () {
      this.bus.$emit('onb2', 'from brother1') // 触发Brother2.vue监听的onb2事件
    }
  },
  created () {
    this.bus.$on('onb1', (param) => { // 创建时，进行事件onb1监听
      console.log('receive onb1', param)
    })
  },
  beforeDestroy () {
    this.bus.$off('onb1') // 销毁时，事件onb1监听取消
    console.log('onb1 listener was closed')
  }
}
</script>
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<template>
  <div class="hello" style="border:1px solid #666">
    <h1>Brother2 component</h1>
    <h2 @click="send">click send onb1</h2>
  </div>
</template>
<script>
export default {
  name: 'Brother2',
  data () {
    return {
      msg: 'Brother2'
    }
  },
  methods: {
    send () {
      this.bus.$emit('onb1', 'from brother2') // 触发Brother1.vue监听的onb1事件
    }
  },
  created () {
    this.bus.$on('onb2', (param) => { // 创建时，进行事件onb1监听
      console.log('receive onb2', param)
    })
  },
  beforeDestroy () {
    this.bus.$off('onb2') // 销毁时，事件onb2监听取消
    console.log('onb2 listener was closed')
  }
}
</script>
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