JavaScript Essentials: Making Web Pages Interactive

What is JavaScript?

JavaScript is a high-level programming language primarily used for client-side development. It allows dynamic content updates, control of multimedia, animation, and more.

Basic Syntax

// Declaring variables
  let name = "Alice";
  const PI = 3.14;
  var age = 25;
  
  // Functions
  function greet() {
    console.log("Hello, " + name);
  }

DOM Manipulation

JavaScript can change HTML content dynamically:

document.getElementById("demo").innerHTML = "Updated with JS!";

Events

You can handle user actions using events:

document.querySelector("button").addEventListener("click", function() {
    alert("Button clicked!");
  });

JavaScript is also used with frameworks like React, Angular, and Vue for full web applications.