Vue全局事件总线和订阅与发布使用案例分析讲解

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

this.$bus.$emit('getName',this.name)//this.name是所要传递的值，

this.$bus.$on('getName',(name)=>{
            console.log( '小红得到的名字',name);
          })

this.$bus.$off('getName')

<template>
	<div>
		姓名：{{name}}年龄：{{age}}<button @click="sendMsg">给小红组件传姓名</button> <button @click="del">销毁传递</button>
	</div>
</template>
<script>
	// import pubsub from 'pubsub-js'
	export default {
	  name: 'XiaoMing',
	  data(){
		return{
			name:'小明',
			age:20
		}
	  },
	  methods:{
		  sendMsg(){
			//   pubsub.publish('usname',this.name)
 
			  this.$bus.$emit('getName',this.name)
		  },
		  del(){
			this.$bus.$off('getName')
			console.log('已销毁');
		  }
	  },
	mounted(){
		// pubsub.subscribe('age',(e,page)=>{
		// 	console.log('小明得到小红',e,page);
		// })
		this.$bus.$on('getAge',(age)=>{
			console.log('小明得到的年龄',age);
		})
	}
	}
</script>
<style>
</style>

<template>
	<div>
		姓名：{{name}}年龄：{{age}} <button @click="sendAge">给小明组件传年龄</button><button >取消订阅</button>
	</div>
</template>
<script>
	// import pubsub from 'pubsub-js'
	export default {
	  name:'XiaoHong',
	  data(){
		return{
			name:'小红',
			age:18
		}
	  },
	  methods:{
		sendAge(){
			// pubsub.publish('age',this.age)
			this.$bus.$emit('getAge',this.age)
		},
		// noRead(){
		// 	pubsub.unsubscribe(this.del)
		// }
	  },
	  mounted(){
		//   this.del=pubsub.subscribe('usname',(q,msg)=>{
		// 	  console.log('小红得到小明',q,msg)
		//   }),
		  this.$bus.$on('getName',(name)=>{
			console.log( '小红得到的名字',name);
		  })
	  },	  
	}
</script>
<style>
</style>

pubsub.publish('usname',this.name) //usname:发布消息的名称，第二个参数：为发布内容

 this.del=pubsub.subscribe('usname',(q,msg)=>{
			  console.log('小红得到小明',q,msg)
		  })

pubsub.unsubscribe(this.del)

<template>
	<div>
		姓名：{{name}}年龄：{{age}}<button @click="sendMsg">给小红组件传姓名</button> <button >销毁传递</button>
 
	</div>
</template>
<script>
	import pubsub from 'pubsub-js'
	export default {
	  name: 'XiaoMing',
	  data(){
		return{
			name:'小明',
			age:20
		}
	  },
	  methods:{
		  sendMsg(){
			  pubsub.publish('usname',this.name)
			//   this.$bus.$emit('getName',this.name)
		  },
		//   del(){
		// 	this.$bus.$off('getName')
		// 	console.log('已销毁');
		//   }
	  },
	mounted(){
		pubsub.subscribe('age',(e,page)=>{
			console.log('小明得到小红',e,page);
		})
		// this.$bus.$on('getAge',(age)=>{
		// 	console.log('小明得到的年龄',age);
		// })
	}
	}
</script>
<style>
</style>

<template>
	<div>
		姓名：{{name}}年龄：{{age}} <button @click="sendAge">给小明组件传年龄</button><button @click="noRead">取消订阅</button>
	</div>
</template>
<script>
	import pubsub from 'pubsub-js'
	export default {
	  name:'XiaoHong',
	  data(){
		return{
			name:'小红',
			age:18
		}
	  },
	  methods:{
		sendAge(){
			pubsub.publish('age',this.age)
			// this.$bus.$emit('getAge',this.age)
		},
		noRead(){
			pubsub.unsubscribe(this.del)
		}
	  },
	  mounted(){
		  this.del=pubsub.subscribe('usname',(q,msg)=>{
			  console.log('小红得到小明',q,msg)
		  })
		//   this.$bus.$on('getName',(name)=>{
		// 	console.log( '小红得到的名字',name);
		//   })
	  },
	}
</script>
<style>
</style>