SoFunction
Updated on 2025-04-03

Basic steps to initialize the application using Vue 3’s createApp method

The release of Vue 3 provides a more powerful and flexible tool set for front-end developers, and one of the core changes iscreateAppIntroduction of methods. This method is the entry to the Vue application and is used to initialize the application instance. This article will explain in detail how to use itcreateAppMethods to initialize a Vue 3 application, from sample code to detailed explanations, help readers fully grasp this core function.

What iscreateAppmethod?

createAppIt is a global API introduced by Vue 3 to create an application instance. With Vuenew Vuedifferent,createAppMethod returns an application instance, not the root component. This design change makes it more flexible to create multiple Vue application instances in the same page.

Basic steps to initialize the application

The basic steps to initialize a Vue application include the following steps:

  • Create a root component: Write a root component as the entry point for the entire application.
  • usecreateAppMethod to create an application instance:passcreateAppMethod passes the root component to the application instance.
  • Mount the application: Mount the application instance onto an element in the HTML DOM.

Sample code

First, we create a basic project structure, the necessary files includeand。

Step 1: Create the root component

existIn the file (when we use single file components):

<template>
  <div >
    <h1>Hello Vue 3!</h1>
  </div>
</template>
<script>
export default {
  name: 'App',
};
</script>
<style>
/* Styles can be added here */
#app {
  text-align: center;
  margin-top: 40px;
}
</style>

Step 2: UsecreateAppMethod to create an application instance

existIn the file:

import { createApp } from 'vue';
import App from './';
// Create a Vue application instance and pass the root component App into itconst app = createApp(App);
// Mount the application instance to HTML In-house #app elements('#app');

Step 3: Set up HTML file

existIn the file:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Vue 3 App</title>
</head>
<body>
  <div ></div>
  <script src="/"></script>
</body>
</html>

This code shows a simplified initialization process for Vue 3 applications. passcreateAppCreate an application instance and root componentAppPass it and usemountMethod mounts the application.

Create plug-ins and application examples

In Vue 3, bycreateAppThe created application instance can be used to install plug-ins. If you have a global plugin that needs to be introduced when the app starts, you can do this:

import { createApp } from 'vue';
import App from './';
// Suppose there is a simple pluginconst myPlugin = {
  install(app) {
    .$myMethod = () =&gt; {
      ('This is my custom global method!');
    }
  }
};
const app = createApp(App);
// Use plug-ins(myPlugin);
// Mount the application instance to HTML In-house #app elements('#app');

Create multiple application instances

Assuming you need to create multiple Vue application instances in the same page, this is almost impossible in Vue 2, but it is very simple in Vue 3:

import { createApp } from 'vue';
// Application 1import App1 from './';
const app1 = createApp(App1);
('#app1');
// Application 2import App2 from './';
const app2 = createApp(App2);
('#app2');

existWe need to add two mount points to the file:

<body>
  <div ></div>
  <div ></div>
</body>

Summarize

passcreateAppMethod, we start with the basic initialization of Vue 3, extending to the application of plug-in, the creation of multiple application instances, etc. This approach and API improvements allow developers to have more operational space and flexibility in actual projects, which is particularly important for large projects and complex needs.

Through the detailed explanation of this article and the example code, I hope you can fully understand Vue 3createAppThe techniques of using methods can be easily dealt with in future practical application scenarios. Developing beautiful and comprehensive applications is the pursuit of every front-end developer, and mastering advanced tools and methods is an important way for us to achieve this goal.

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