JavaScript
JavaScript is a high-level, interpreted programming language primarily used for adding interactivity and dynamic behavior to web pages. It is one of the core technologies of the World Wide Web alongside HTML and CSS. JavaScript allows developers to manipulate the content, structure, and behavior of web pages in response to user interactions, events, and other triggers.
JavaScript code can be embedded directly into HTML documents or included as external script files (.js) referenced from HTML. It runs on the client-side (in the web browser) and is commonly used for tasks such as form validation, DOM manipulation, event handling, AJAX requests, and dynamic content generation.
To add JavaScript to an HTML page, you can use one of the following methods:
1. **Inline JavaScript**:
You can include JavaScript code directly within the `<script>` tags in the HTML document. Inline JavaScript is typically placed within the `<head>` or `<body>` section of the HTML document.
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Inline JavaScript Example</title>
</head>
<body>
<h1>Inline JavaScript Example</h1>
<!-- Inline JavaScript -->
<script>
// JavaScript code
alert('Hello, World!');
</script>
</body>
</html>
```
2. **External JavaScript File**:
You can create a separate JavaScript file (.js) containing your JavaScript code and include it in the HTML document using the `<script>` tag's `src` attribute.
**index.html:**
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>External JavaScript Example</title>
</head>
<body>
<h1>External JavaScript Example</h1>
<!-- External JavaScript -->
<script src="script.js"></script>
</body>
</html>
```
**script.js:**
```javascript
// JavaScript code in external file (script.js)
alert('Hello, World!');
```
In both methods, the JavaScript code enclosed within the `<script>` tags (inline or external) is executed when the browser encounters it while parsing the HTML document. This allows you to perform various actions, such as displaying alerts, manipulating DOM elements, handling events, or making AJAX requests, to create interactive and dynamic web pages.
0 Comments
I really appreciate for your words. Thank you very much for your comment.