javascript

What is JavaScript?

JavaScript is a high-level, interpreted programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. It adds interactivity to websites and is used by 97% of all websites in some form.

Why Learn JavaScript?

Widely Used: It's everywhere — from simple websites to complex web apps. Versatile: Runs in the browser and also on servers (via Node.js). In-Demand: A top skill in the job market for developers. Beginner-Friendly: Easy to start, powerful enough to build real-world applications.

What Can JavaScript Do?

Validate forms Show alerts and pop-ups Create sliders, modals, and interactive UI Fetch data from servers without reloading the page (AJAX) Build full-stack applications using Node.js, Express, and more

How JavaScript Fits in the Web

HTML Structure/content CSS Styling/appearance JavaScript Behavior/interactivity

Handling click in Webiste

When you click the button, the browser shows an alert. That’s JavaScript in action!

<html>
  <head>
    <title>Hello JavaScript</title>
  </head>
  <body>
    <h1>Welcome to JavaScript!</h1>
    <button onclick="sayHello()">Click Me</button>

    <script>
      function sayHello() {
        alert('Hello, JavaScript Learner!');
      }
    </script>
  </body>
</html>

Tools You Need
 Browser: Chrome, Firefox, Edge, or Safari
 Text Editor: VS Code, Sublime, or any basic editor
  Console: Use DevTools in browser to test JS code (`Right-click > Inspect > Console`)