What is JavaScript? What is the introduction and first JavaScript program?
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JavaScript is a high-level, interpreted programming language primarily used for web development. It was originally created to add interactivity and dynamic behavior to web pages. Over time, JavaScript has evolved and expanded its scope, becoming a versatile language that can be used for both client-side and server-side development.
Introduction to JavaScript:
JavaScript was created by Brendan Eich at Netscape Communications in 1995. It was initially named "LiveScript" but was later renamed to JavaScript to capitalize on the growing popularity of Java at the time. Despite the name similarity, JavaScript and Java are different languages with distinct purposes and syntax.
JavaScript is primarily used in web browsers to enhance the functionality of web pages. It allows developers to manipulate the HTML structure, handle user interactions, perform calculations, make network requests, and much more. With the introduction of Node.js, JavaScript can now be used on the server-side as well, enabling full-stack JavaScript development.
First JavaScript Program:
To write and execute your first JavaScript program, follow these steps:
Step 1: Create an HTML file:
Create a new file with a ".html" extension using a text editor. For example, name it "index.html".
Step 2: Add the HTML structure:
In the HTML file, add the basic structure including the opening and closing HTML tags, head, and body. For example:
<!DOCTYPE html>
<html>
<head>
<title>My First JavaScript Program</title>
</head>
<body>
</body>
</html>Step 3: Add a script tag:
Inside the body section of the HTML file, add a script tag to include your JavaScript code. For example:
<!DOCTYPE html>
<html>
<head>
<title>My First JavaScript Program</title>
</head>
<body>
<script>
// JavaScript code goes here
</script>
</body>
</html>Step 4: Write your JavaScript code:
Inside the script tag, you can write your JavaScript code. For example, let's write a simple program that displays a greeting in the browser's console:
<!DOCTYPE html>
<html>
<head>
<title>My First JavaScript Program</title>
</head>
<body>
<script>
// JavaScript code
console.log("Hello, World!");
</script>
</body>
</html>Step 5: Open the HTML file in a web browser:
Save the HTML file and open it in a web browser. You can do this by double-clicking the file or using the browser's "Open File" option. The browser will render the HTML and execute the JavaScript code. Open the browser's console (usually accessed by pressing `Ctrl+Shift+J` or `Cmd+Option+J`) to see the output of the `console.log` statement.
Congratulations! You have written and executed your first JavaScript program. This basic example demonstrates how to include JavaScript code in an HTML file and interact with the browser's console. From here, you can explore and learn more about JavaScript's extensive capabilities and its role in web development.
Categories: Java Script Tags: #ES6, #JavaScript,