Vue消息订阅与发布

 

引入第三方库pubsub.js:

npm i pubsub-js

Student.vue

import pubsub from 'pubsub-js'

 methods:{sendStudentName(){// this.$bus.$emit('hello',this.name)pubsub.publish('hello',666)}},

School.vue

import pubsub from 'pubsub-js'

 mounted() {// console.log("school",this.x)
/*    this.$bus.$on('hello',(data)=>{console.log('我是school组件，收到了数据',data)})*/this.pubId = pubsub.subscribe('hello',function (msgName,data){console.log('有人发布了hello消息，hello消息的回调执行了',msgName,data)})},beforeDestroy() {// this.$off('hello')pubsub.unsubscribe(this.pubId)},
}

TodoList案例使用消息订阅实现删除功能：

App.vue:

import pubsub from 'pubsub-js'

 mounted() {this.$bus.$on('checkTodo',this.checkTodo)this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)},beforeDestroy() {this.$bus.$off('checkTodo')pubsub.unsubscribe(this.pubId)}
}

MyItem.vue:

import pubsub from 'pubsub-js'

  methods:{//勾选or取消勾选handleCheck(id){//通知App组件将对应的todo对象的done值取反// this.checkTodo(id)this.$bus.$emit('checkTodo',id)},//删除handleDelete(id){if (confirm('确定删除吗')){  //confirm根据用户的交互来决定到底是布尔值为真还是为假，点击确定为真，点击取消为假// this.deleteTodo(id)pubsub.publish('deleteTodo',id)}}