平级组件的通信 一个全局发布订阅模式，它是挂载到全局的
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>组件通信 &bus</title> <script src="./node_modules/vue/dist/vue.js"></script> </head> <body> <div id="app"> <children1></children1> <children2></children2> </div> </body> <script> //发布订阅模式 //适合简单的数据流 Vue.prototype.$bus = new Vue(); Vue.component('children1',{ template:`<div><span>children1</span></div>`, mounted() { this.$bus.$on('吃',(food)=>{ console.log(food) }) }, }) Vue.component('children2',{ template:`<div><span>children2</span></div>`, mounted() { this.$bus.$emit('吃','月饼') }, }) let vm = new Vue({ el:'#app', }) //hello </script> </html>