<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Vue 测试实例 - 菜鸟教程(runoob.com)</title> <script src="https://unpkg.com/vue@next"></script> </head> <body> <div id="app"><button-counter></button-counter> </div><script> // 创建一个Vue 应用 const app = Vue.createApp({})// 定义一个名为 button-counter 的新全局组件 app.component('button-counter', {data() {return {count: 0}},template: `<bu...