Introduction to JavaScript — JavaScript Tutorial

What is JavaScript?

JavaScript is a programming language that enables you to create dynamically updating content, control multimedia, animate images, and much more.

JavaScript is the programming language of the Web and runs in your browser.

Example

// JavaScript Syntax
console.log('Hello, World!');

// Variables
let name = 'John';
const age = 25;

// Function
function greet() {
  alert('Hello!');
}

Try JavaScript

HTML

<h1 id="demo">JavaScript Demo</h1>
<button onclick="changeText()">Click Me</button>

CSS

button { padding: 10px 20px; background: #d1039e; color: white; border: none; border-radius: 5px; cursor: pointer; }

JavaScript

function changeText() {
  document.getElementById('demo').innerHTML = 'Text Changed!';
  document.getElementById('demo').style.color = '#d1039e';
}

Notes

JavaScript adds interactivity and dynamic behavior to your websites.