Js Introduction in JavaScript
? JavaScript Introduction
JavaScript is a powerful scripting language that allows you to create interactive, dynamic web pages.
? What is JavaScript?
JavaScript (JS) is a lightweight, interpreted programming language.
It is used to add interactivity to websites.
Runs in the browser (client-side) and on servers (with Node.js).
? JavaScript Can Be Used To:
Change HTML content dynamically
React to user actions (clicks, typing, etc.)
Validate forms before submission
Create animations and effects
Fetch data from servers (AJAX, Fetch API)
Build web and mobile apps (React, Angular, etc.)
? Basic Syntax Example
<!DOCTYPE html><html> <body> <h2 id="demo">Welcome</h2> <button onclick="changeText()">Click Me</button> <script> function changeText() { document.getElementById("demo").innerText = "Hello, JavaScript!"; } </script> </body></html>? JavaScript is Built Into the Browser
Supported by all modern browsers
You can open Developer Tools ? Console to write and test JS
? JavaScript vs Java
| JavaScript | Java |
|---|---|
| Interpreted | Compiled |
| Runs in browser | Runs in JVM |
| Dynamic typing | Static typing |
| Mostly used for web | Used for web, apps, games |
? Where Does JavaScript Go?
Inline:
<button onclick="alert('Hello')">Click</button>Internal:
<script> alert("Hello from script");</script>External:
<script src="script.js"></script>
?? Key Features
Dynamic typing
First-class functions
Prototype-based OOP
Event-driven programming
Asynchronous support (
callbacks,Promises,async/await)
Would you like a full JavaScript learning roadmap, or want to build a mini project to practice?
