What does Vue initialization mean?

Vue is a very popular JavaScript framework that is widely used to build modern web applications. Before you start learning Vue, you need to understand Vue's initialization process in order to use Vue correctly and create repeatable code.

Initializing Vue refers to creating a Vue instance in the page, which can manage the state of the application and changes in the rendering interface. Vue instances are the core part of the Vue framework and the first concept you need to understand when using the Vue framework.

The Vue initialization process includes:

1. Introduce Vue.js

Introduce Vue.js into the HTML page, which can be done through CDN or local files Introduction. If you choose CDN to introduce Vue.js, you can use the following code:

<script src="https://cdn.jsdelivr.net/npm/vue"></script>

If you choose a local file to introduce Vue.js, you can download the file and add the following code in the HTML file:

<script src="path/to/vue.js"></script>

2. Create Vue instance

After introducing Vue.js, you need to create a Vue instance in the JavaScript file. You can create a Vue instance through the following code:

var vm = new Vue({
  // options
})

When creating a Vue instance, you need to pass some options. Options for Vue instances include data, computed properties, methods, lifecycle hooks, and more.

Among them, the data option is required. Data options include the initial state of the application, and the Vue instance will automatically update the interface by monitoring changes in these data.

For example:

var vm = new Vue({
  data: {
    message: 'Hello, world!'
  }
})

This Vue instance has a data option, which contains a message attribute whose initial value is 'Hello, world!'. You can render this message attribute to the page through template binding and directives.

3. Mount the Vue instance

After creating the Vue instance, you need to mount it on an HTML element. You can mount the Vue instance to an element through the following code:

var vm = new Vue({
  el: '#app'
})

The el option specifies a CSS selector, which represents the HTML element to which the Vue instance is to be mounted. This element can be an ID selector, a class selector, or a label selector.

When a Vue instance is mounted on an HTML element, the Vue instance will automatically render the content of the element and manage it. When the Vue instance's data changes, the Vue instance automatically updates the content of the HTML element.

Summary:

The above is the initialization process of Vue. When creating a Vue instance, you need to pass some options such as data, computed properties, methods, etc. When the Vue instance is mounted on the HTML page, the Vue instance will automatically render the content of the HTML element and manage it. When the data changes, the Vue instance automatically updates the content of the HTML element.

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