<!DOCTYPE html> <html> <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></title> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> <script src="https://unpkg.com/vue-router/dist/vue-router.js"></script> <script src="https://unpkg.com/axios/dist/axios.min.js"></script> </head> <body> <div id='app'> <father></father> </div> <template id="father"> <div> {{fathermsg}} <!-- 6、使用son传来的信息 --> {{usesonmsg}} <!-- 2、@定义一个方法,用于接收son传过来的信息 --> <!-- 定义getsonmsg方法接收son传来的信息 --> <son @send-msg-to-father='getsonmsg'></son> </div> </template> <template id="son"> <div> {{sonmsg}} </div> </template> <script> Vue.component('father',{ template:'#father', data(){ return{ fathermsg:'父元素信息', usesonmsg:''//4、定义数据用来接收使用来自son的信息 } }, methods:{ // 3、得到son传过来的信息,固定参数data getsonmsg(data){ console.log(data);// 打印结果 子元素信息 this.usesonmsg = data//5、将得到的data传给usesonmsg使用 } } }) Vue.component('son',{ template:'#son', data(){ return{ sonmsg:'子元素信息' } }, created(){ // 1、this.$emit两个参数(要传给谁,要传的信息) // 把this.sonmsg传给fromson this.$emit('send-msg-to-father',this.sonmsg) } }) const vm = new Vue({ el: '#app', data: { }, methods: { }, }) </script> </body> </html>