Learn basic JavaScript

What is JavaScript?

JavaScript is a programming language used to add interactivity to web pages, such as dynamic content updates, animations, and form validations.

JavaScript can be added to a webpage in three ways:

Inline: Directly inside an element's onclick, onchange, etc.
Internal: Inside a <script> tag within the HTML.
External: Linked as a separate file using <script src="script.js"></script>.

Click the button below to see JavaScript in action:

Here are some basic concepts:

Variables: Used to store data.

let name = "John";
const age = 25;
var isStudent = true;

Functions: Blocks of reusable code.

function greet() {
    alert("Hello, world!");
}

Events: Actions like clicks or key presses.

button.addEventListener('click', function() {
    alert('Button clicked!');
});

Here’s a simple script to display a message:

To use external JavaScript, create a file named script.js and link it in the HTML:

<script src="script.js"></script>

In script.js, you can write your JavaScript code:

// Example script.js content
function showAlert() {
    alert("This is an external JavaScript file!");
}