What is Java script ?
JavaScript code is a versatile programming language primarily used for creating interactive effects within web browsers. It allows developers to manipulate elements on web pages, respond to user actions like clicks and keyboard input, and dynamically update content without reloading the entire page.
Here’s a simple example of JavaScript code embedded within a HTML file:
<!DOCTYPE html>
<html>
<head>
<title>Javascript example</title>
<script>
function greet() {
var name = prompt("enter your name:");
if (name != null && name != "") {
alert("Hello, " + name + "!");
}
}
</script>
</head>
<body>
<h2>Javascript Example</h2>
<button onclick="greet()">Click to Greet</button>
</body>
</html>
In this example:
– JavaScript code is embedded within `<script>` tags in the `<head>` section of the HTML file.
– The `greet()` function prompts the user to enter their name using `prompt()` and displays a greeting message using `alert()`.
When the user clicks the “Click to Greet” button, the `greet()` function is executed, demonstrating how JavaScript can interact with users and manipulate the webpage dynamically.
JavaScript is a powerful and versatile programming language primarily used for front-end development on the web.
Here are some key aspects and features of JavaScript:
Client-Side Scripting: JavaScript runs on the client side enabling dynamic interactions with web pages. It can manipulate HTML content, modify CSS styles, and respond to user actions such as clicks and keyboard input.
High-level Language: JavaScript is a high-level, interpreted language, meaning it does not require compilation before execution. This makes it accessible and quick to deploy for web developers.
Object-Oriented: JavaScript supports object-oriented programming (OOP) concepts such as objects, classes, and inheritance. It allows developers to create reusable and organized code structures.
Asynchronous Programming: JavaScript is capable of asynchronous programming, which allows tasks to run independently without blocking the main execution thread. This is crucial for handling tasks like fetching data from servers or performing animations without freezing the user interface.
Cross-platform Compatibility: JavaScript is supported by all modern web browsers, making it a universal language for client-side scripting. Additionally, JavaScript is used beyond web development, such as in server-side environments (Node.js) and mobile app development (React Native).
Libraries and Frameworks: There are numerous JavaScript libraries and frameworks that extend its capabilities and simplify development tasks. Examples include jQuery for DOM manipulation, React and Angular for building user interfaces, and Express.js for server-side web applications.
JavaScript continues to evolve with new features and improvements, maintaining its critical role in web development and expanding into other domains due to its versatility and extensive ecosystem.
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