JavaScript Introduction

JavaScript

JavaScript is the programming language of the web. It makes websites interactive — buttons that click, forms that validate, content that updates without reloading.

What Can JavaScript Do?

Change HTML content and styles
React to user events (clicks, typing)
Validate form data
Create animations and games
Build full applications (React, Node.js)

Example — JAVASCRIPT

// Show a message
alert("Hello, World!");

// Change page content
document.getElementById("demo")
    .innerHTML = "JavaScript is fun!";

// Log to console (for debugging)
console.log("Page loaded!");

// Simple calculation
let price = 100;
let tax = price * 0.18;
console.log("Tax: ₹" + tax);

Result

▶ Alert: "Hello, World!"
▶ Element updated: "JavaScript is fun!"
▶ Console: "Page loaded!"
▶ Console: "Tax: ₹18"

Next JavaScript Variables

JavaScript Introduction

What Can JavaScript Do?

Continue Learning