src_全局事件总线
# 代码
# 代码路径
$ tree -N
.
├── App.vue
├── components
│ ├── School.vue
│ └── Student.vue
└── main.js
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# App.vue
<template>
<div class="app">
<h1>{{msg}} {{studentName}}</h1>
<School></School>
<Student></Student>
</div>
</template>
<script>
import School from './components/School.vue'
import Student from './components/Student.vue'
export default {
name:'App',
components:{School,Student},
data() {
return {
msg:'你好啊!',
studentName:'',
}
}
}
</script>
<style>
.app{
background-color: gray;
}
</style>
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# School.vue
<template>
<div class="school">
<h2> 学校名称:{{name}} </h2>
<h2> 学校地址:{{address}} </h2>
</div>
</template>
<script>
export default {
name:'School',
data() {
return {
name:'shangguigua',
address:'beijing'
}
},
mounted() {
this.$bus.$on('hello',(data)=>{
console.log('我是School组件,收到了数据',data);
})
},
beforeDestroy() {
this.$bus.$off('hello')
},
}
</script>
<style scoped>
.school{
background-color: blue;
}
</style>
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# Student.vue
<template>
<div class="student">
<h2> 学生姓名:{{name}} </h2>
<h2> 学生性别:{{sex}} </h2>
<button @click="sendStudentName">点我把学生名字发送给School</button>
</div>
</template>
<script>
export default {
name:'Student',
data() {
return {
name:'eryajf',
sex:'男',
number:1
}
},
methods: {
sendStudentName(){
this.$bus.$emit('hello',this.name)
}
},
}
</script>
<style scoped>
.student{
background-color: orange;
}
</style>
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# main.js
import Vue from "vue"
import App from './App.vue'
Vue.config.productionTip = false
new Vue({
el: '#app',
components:{App},
render: h => h(App),
beforeCreate() {
Vue.prototype.$bus = this // 安装全局事件总线
},
});
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# 笔记
- 一种组件间通信的方式,适用于任意组件间通信。
- 安装全局事件总线:
new Vue({
......
beforeCreate() {
Vue.prototype.$bus = this //安装全局事件总线,$bus就是当前应用的vm
},
......
})
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- 使用事件总线:
- 接收数据:A 组件想接收数据,则在 A 组件中给
$bus
绑定自定义事件,事件的回调留在 A 组件自身。
```js
methods(){
demo(data){......}
}
......
mounted() {
this.$bus.$on('xxxx',this.demo)
}
```
- 提供数据:
this.$bus.$emit('xxxx',数据)
- 最好在 beforeDestroy 钩子中,用$off 去解绑当前组件所用到的事件。
上次更新: 2024/02/28, 13:00:35