JavaScript Tutorial

Welcome to the JavaScript tutorial. Here you will learn the basics of JavaScript and how to use it to add interactivity to web pages.

Introduction to JavaScript

JavaScript is a programming language that allows you to implement complex features on web pages, such as dynamically updating content, controlling multimedia, and much more.

JavaScript Syntax

JavaScript is a lightweight, interpreted language that is run in the browser. Here is a simple example:

function sayHello() {
    alert("Hello, World!");
}
sayHello();
        

JavaScript Variables

Variables are used to store data values. In JavaScript, you can declare variables using var, let, or const.

let name = "John";
const age = 30;
var isStudent = true;
        

JavaScript Data Types

JavaScript provides different data types to hold different types of values, such as strings, numbers, objects, and more.

let text = "Hello";
let number = 123;
let object = { firstName: "John", lastName: "Doe" };
        

JavaScript Functions

Functions are blocks of code designed to perform a particular task. They are executed when they are called.

function add(a, b) {
    return a + b;
}
let result = add(5, 10);
console.log(result);
        

DOM Manipulation

The Document Object Model (DOM) is a programming interface for web documents. It represents the page so that programs can change the document structure, style, and content.

document.getElementById("myElement").innerHTML = "New Content";
        

JavaScript Events

Events are actions that occur when users interact with the web page, such as clicking a button or pressing a key.

document.getElementById("myButton").addEventListener("click", function() {
    alert("Button was clicked!");
});
        

Conclusion

This is a basic introduction to JavaScript. With this knowledge, you can start adding interactivity to your web pages. As you learn more, you'll be able to create complex web applications.