HTML and JavaScript are the two most commonly used client-side technologies. HTML is the foundation of web pages, while JavaScript enhances the interactivity and dynamic nature of websites. When writing HTML code, we can easily add JavaScript code to achieve more functions and effects. This article explains how to add JavaScript to HTML.
I. Using built-in tags
HTML 5 introduced the built-in <script></script> tag for embedding JavaScript code in pages. You can place the <script></script> tag at the beginning or end of your HTML code and add JavaScript code within it. For example:
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Demo</title>
<meta charset="UTF-8">
</head>
<body>
<h1 id="欢迎来到-JavaScript-世界">欢迎来到 JavaScript 世界</h1>
<script>
alert("Hello World!");
</script>
</body>
</html>In the above code, we added a simple alert dialog box in the <script></script> tag to use when the page loads Display message. It is important to note that if you put the <script></script> tag in the head, you should use an async or lazy attribute to load the JavaScript file to ensure that the HTML page is not blocked by JavaScript code.
II. Using external files
If your JavaScript code is long or needs to be used in multiple pages, it is best to save it in a separate .js file and use external <script></script> tag for reference. For example:
<!DOCTYPE html> <html> <head> <title>JavaScript Demo</title> <meta charset="UTF-8"> <script src="script.js"></script> </head> <body> <h1 id="欢迎来到-JavaScript-世界">欢迎来到 JavaScript 世界</h1> </body> </html>
In the above code, we referenced a file named script.js## using the src attribute of the
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