Vue2.0常用的组件通信方式(父子组件通信，兄弟、跨级组件通信)

组建通信的基本模式:父子组件的关系可以总结为 prop 向下传递，事件向上传递。父组件通过 prop 给子组件下发数据，子组件通过事件给父组件发送消息

组件通信的常用三种方式

1.props(父组件向子组件传值)

parent.vue

<template> <div> <parent-child :childName="childName"></parent-child> </div> </template> <script> import child from "./child" export default { components: { "parent-child" : child },data(){ return { childName : "我是child哦" } } } </script>

child.vue

<template> <div id="child"> child的名字叫:{{childName}}<br> </div> </template> <script> export default { props:{ childName :{ type:String, default: "" } } } </script>

2.$emit(子组件向父组件传值–局部消息订阅)

parent.vue

<template> <div> <parent-child :childName="childName" @childNotify="childReceive"></parent-child> </div> </template> <script> import child from "./child" export default { components: { "parent-child" : child },data(){ return { childName : "我是child哦" } },methods:{ childReceive(params){ this.$message(params) } } } </script>

child.vue

<template> <div id="child"> child的名字叫:{{childName}}<br> </div> </template> <script> export default { props:{ childName :{ type:String, default: "" } },methods:{ childNotify(params){ this.$emit("childNotify","child的名字叫"+this.childName); } } } </script>

3.bus全局消息订阅

bus.js

const install = (Vue) => { const Bus = new Vue({ methods: { on (event, ...args) { this.$on(event, ...args); }, emit (event, callback) { this.$emit(event, callback); }, off (event, callback) { this.$off(event, callback); } } }) Vue.prototype.$bus = Bus; } export default install;

main.js

import Bus from "./assets/js/bus"; Vue.use(Bus);

child.vue

<template> <div id="child"> child的名字叫:{{childName}}<br> <el-button type="primary" @click="brotherNotity">向child2打招呼</el-button> </div> </template> <script> export default { props:{ childName :{ type:String, default: "" } },methods:{ childNotify(params){ this.$emit("childNotify","child的名字叫"+this.childName); }, brotherNotity(){ this.$bus.$emit("child2","child2你好呀"); } } } </script>

child2.vue

<template> <div id="child2"> child2的名字叫:{{child2Name}} </div> </template> <script> export default { props:{ child2Name :{ type:String, default: "" } }, created(){ this.$bus.$on("child2",function(params){ this.$message(params) }) }, beforeDestroy() { this.$bus.$off("child2",function(){ this.$message("child2-bus销毁") }) } } </script>