Vue main.js: Entry File Guide

In a Vue project, main.js serves as the entry file for the project, primarily used to initialize the Vue instance and specify the root component. Inside main.js, we typically import Vue and the root component, then create a new Vue instance and mount the root component to a specific DOM element on the page.

Here is a typical usage of main.js:

// 导入Vue和根组件
import Vue from 'vue'
import App from './App.vue'

// 创建一个新的Vue实例
new Vue({
  render: h => h(App)
}).$mount('#app')

In the code above, we start by importing Vue and the root component App. Then we create a new Vue instance and pass in the root component App. Finally, we mount the root component to the DOM element with the id ‘app’ using the $mount method.

In main.js, you can also make some global configurations, such as importing Vue plugins, routes, state management, etc. The main function is to initialize the Vue instance, load the root component, and specify the DOM node where the root component is mounted.