main.js

```bash
const app = Vue.createApp({
    data() {
        return {
            product: 'Socks'
        }
    }
})

网址：
https://www.vuemastery.com/courses/intro-to-vue-3/creating-the-vue-app-vue3

https://codepen.io/VueMastery/project/editor/XvJmbL


helloword.vue代码地址：
https://codepen.io/team/Vue/pen/KKpRVpx