npm i pubsub-js
该技术在vue中被事件总线完全替代
消息订阅与发布(pubsub)
-
一种组件间通信的方式,适用于任意组件间通信。
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使用步骤:
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安装pubsub:
npm i pubsub-js
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引入:
import pubsub from 'pubsub-js'
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接收数据:A组件想接收数据,则在A组件中订阅消息,订阅的回调留在A组件自身。
methods(){ demo(data){......} } ...... mounted() { this.pid = pubsub.subscribe('xxx',this.demo) //订阅消息 }
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提供数据:
pubsub.publish('xxx',数据)
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最好在beforeDestroy钩子中,用
PubSub.unsubscribe(pid)
去取消订阅。
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components
School.vue
<template>
<div class="school">
<h2>学校名称:{{name}}</h2>
<h2>学校地址:{{address}}</h2>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'School',
data() {
return {
name:'尚硅谷',
address:'北京',
}
},
mounted() {
// console.log('School',this)
/* this.$bus.$on('hello',(data)=>{
console.log('我是School组件,收到了数据',data)
}) */
this.pubId = pubsub.subscribe('hello',(msgName,data)=>{
console.log(this)
// console.log('有人发布了hello消息,hello消息的回调执行了',msgName,data)
})
},
beforeDestroy() {
// this.$bus.$off('hello')
pubsub.unsubscribe(this.pubId)
},
}
</script>
<style scoped>
.school{
background-color: skyblue;
padding: 5px;
}
</style>
Student.vue
<template>
<div class="student">
<h2>学生姓名:{{name}}</h2>
<h2>学生性别:{{sex}}</h2>
<button @click="sendStudentName">把学生名给School组件</button>
</div>
</template>
<script>
import pubsub from 'pubsub-js'
export default {
name:'Student',
data() {
return {
name:'张三',
sex:'男',
}
},
mounted() {
// console.log('Student',this.x)
},
methods: {
sendStudentName(){
// this.$bus.$emit('hello',this.name)
pubsub.publish('hello',666)
}
},
}
</script>
<style lang="less" scoped>
.student{
background-color: pink;
padding: 5px;
margin-top: 30px;
}
</style>
App.vue
<template>
<div class="app">
<h1>{{msg}}</h1>
<School/>
<Student/>
</div>
</template>
<script>
import Student from './components/Student'
import School from './components/School'
export default {
name:'App',
components:{School,Student},
data() {
return {
msg:'你好啊!',
}
}
}
</script>
<style scoped>
.app{
background-color: gray;
padding: 5px;
}
</style>
main.js
//引入Vue
import Vue from 'vue'
//引入App
import App from './App.vue'
//关闭Vue的生产提示
Vue.config.productionTip = false
//创建vm
new Vue({
el:'#app',
render: h => h(App),
})