Vue全局事件总线你了解吗

<template>
    <div class="app">
        <Company/>
        <Employee/>
    </div>
</template>

<script>
import Company from "./components/Company.vue";
import Employee from "./components/Employee.vue";

export default {
    components:{
        Company,
        Employee
    }
}
</script>

<style>
.app{
    background: gray;
    padding: 5px;
}
.btn{
    margin-left:10px;
    line-height: 30px;
    background: ivory;
    border-radius: 5px;
}
</style>

<template>
  <div class="company">
      <h2>公司名称：{{name}}</h2>
      <h2>公司地址：{{address}}</h2>
      <button @click="sendMessage">点我发送</button>
  </div>
</template>

<script>
export default {
    name:"Company",
    data(){
        return {
            name:"五哈技术有限公司",
            address:"上海宝山"
        }
    },
    methods:{
        sendMessage(){
            console.log("Company组件发送数据：",this.name);
            this.$bus.$emit("demo",this.name);
        }
    }

}    
</script>

<style scoped>
.company{
    background: orange;
    background-clip: content-box;
    padding: 10px;
}
</style>

<template>
  <div class="employee">
      <h2>员工姓名：{{name}}</h2>
      <h2>员工年龄：{{age}}</h2>
  </div>
</template>

<script>
export default {
    name:"Employee",
    data(){
        return {
            name:"张三",
            age:25
        }
    },
    mounted(){
        this.$bus.$on("demo",(data) => {
            console.log("Employee组件监听demo，接收数据：",data);
        })
    },
    beforeDestroy() {
        this.$bus.$off("demo");
    }
}

</script>

<style scoped>
.employee{
    background: skyblue;
    background-clip: content-box;
    padding: 10px;
}
</style>

import Vue from 'vue';  
import App from './App.vue';

Vue.config.productionTip = false;

new Vue({
  el:"#app",
  render: h => h(App),
  beforeCreate(){ 
    Vue.prototype.$bus = this;
  }
})

new Vue({
  beforeCreate(){ 
    Vue.prototype.$bus = this;
  }
})