Introduction to Vue.js

Vue.js is a popular JavaScript framework for building web applications. It was created by Evan You, an ex-Google employee, in 2014 and has since gained a strong community of developers around the world.

Vue.js is known for its simplicity and ease of use, making it a great choice for developers of all skill levels. It is also very lightweight, with a runtime size of only 18-21KB, making it a fast and efficient framework for building web applications.

Key Features of Vue.js

Reactive Components: Vue.js uses a reactive system to update the components in your application when the data changes. This means that you don’t have to manually update the components yourself, as the framework will automatically update them for you.
Virtual DOM: Vue.js uses a virtual DOM (Document Object Model) to update the actual DOM efficiently. This means that the framework will only update the parts of the DOM that have changed, rather than re-rendering the entire DOM tree.
Two-Way Data Binding: Vue.js uses two-way data binding, which means that changes made to the data in the view (i.e., the user interface) will be reflected in the underlying data model, and vice versa.
Computed Properties: Vue.js allows you to define computed properties, which are functions that return a value based on other data in your application. These computed properties are updated automatically when the data they depend on changes.
Single File Components: Vue.js allows you to define your components in a single file, which includes the HTML, CSS, and JavaScript for the component. This makes it easy to organize and maintain your code.

Getting Started with Vue.js

Installation

To use Vue.js in your application, you can either include it as a script tag in your HTML file, or install it using a package manager like npm or yarn.

Script Tag

To include Vue.js in your application using a script tag, you can include the following line in the head of your HTML file:

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

This will include the latest version of Vue.js in your application.

npm or yarn

To install Vue.js using npm or yarn, you can run the following command:

npm install vue

yarn add vue

This will install Vue.js as a dependency in your project. You can then include it in your application by using an import statement:

Copy codeimport Vue from 'vue';

Hello World Example

Now that you have Vue.js installed, let’s create a simple “Hello World” example to see how it works.

First, create an HTML file with the following content:

<div id="app">
  {{ message }}
</div>

This defines a simple div element with an ID of “app” and a placeholder for a message.

Next, create a JavaScript file with the following content:

const app = new

Key Features of Vue.js

Reactive Components: Vue.js uses a reactive system to update the components in your application when the data changes. This means that you don’t have to manually update the components yourself, as the framework will automatically update them for you.
Virtual DOM: Vue.js uses a virtual DOM (Document Object Model) to update the actual DOM efficiently. This means that the framework will only update the parts of the DOM that have changed, rather than re-rendering the entire DOM tree.
Two-Way Data Binding: Vue.js uses two-way data binding, which means that changes made to the data in the view (i.e., the user interface) will be reflected in the underlying data model, and vice versa.
Computed Properties: Vue.js allows you to define computed properties, which are functions that return a value based on other data in your application. These computed properties are updated automatically when the data they depend on changes.
Single File Components: Vue.js allows you to define your components in a single file, which includes the HTML, CSS, and JavaScript for the component. This makes it easy to organize and maintain your code.