Creating a Vue Application 创建 Vue 应用

The application instance 应用实例

import { createApp } from 'vue'

const app = createApp({
  /* root component options */
})

The Root Component 根组件

单文件式的引入：

import { createApp } from 'vue'
// import the root component App from a single-file component.
import App from './App.vue'

const app = createApp(App)

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https://vuejs.org/guide/essentials/application.html