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我把这个实例分为几个步骤解读：
1、父组件的button元素绑定click事件,该事件指向notify方法
2、给子组件注册一个ref=“child”
3、父组件的notify的方法在处理时，使用了$refs.child把事件传递给子组件的parentMsg方法，同时携带着父组件中的参数msg
4、子组件接收到父组件的事件后，调用了parentMsg方法，把接收到的msg放到message数组中
父组件
<template> <div id="app"> <!--父组件--> <input v-model="msg" /> <button v-on:click
="notify">广播事件</button> <!--子组件--> <popup ref="child"></popup> </div> </template
> <script> import popup from "@/components/popup"; export default { name: "app",
data: function () { return { msg: "", }; }, components: { popup, }, methods: {
notify: function () { if (this.msg.trim()) { this.$refs.child.parentMsg(this.msg
); } }, }, }; </script> <style> #app { font-family: "Avenir", Helvetica, Arial,
sans-serif; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing:
grayscale; text-align: center; color: #2c3e50; margin-top: 60px; } </style>
子组件
<template> <div> <ul> <li v-for="item in messages">父组件输入了：{{ item }}</li> </ul>
</div> </template> <style> body { background-color: #ffffff; } </style> <script>
export default { name: "popup", data: function () { return { messages: [], }; },
methods: { parentMsg: function (msg) { this.messages.push(msg); }, }, }; </
script>