What file is the JavaScript code in:
JavaScript is a programming language used to implement web page interaction. In modern web pages, JavaScript is often used to create responsive, interactive user interfaces and can interact with back-end data, giving users a better experience. However, for beginners, it is easy to be confused by where JavaScript files are stored.
JavaScript files can be stored in the following two ways:
- External JavaScript files
External JavaScript files are usually placed in independent .js files , the suffix is .js, for example: script.js. External JavaScript files need to be referenced through script tags in the HTML file. Take the link path as an example:
<!DOCTYPE html>
<html>
<head>
<script src="script.js"></script>
</head>
<body>
</body>
</html>In the above code, the script tag is used to obtain the JavaScript code from the script.js file. Therefore, the src attribute needs to be set in the script tag to tell the browser the JavaScript file that needs to be loaded. path of. At this point the browser will send a request to obtain the script.js file and run it.
The advantage of external JavaScript files is that the same code can be used in multiple pages at the same time, improving the reusability of the code. In addition, external JavaScript files can be cached, making web pages load faster and making JavaScript code easier to maintain and update.
- Internal JavaScript code
Internal JavaScript code writes JavaScript code directly in the HTML file, usually using script tags to wrap the code. For example:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
// JavaScript代码
</script>
</body>
</html>In the above code, the JavaScript code in the script tag will be executed directly when the web page is loaded.
The advantage of internal JavaScript code is that it can make the web page code more concise, and at the same time, scattered functional requirements can be completed directly in the HTML file. However, internal JavaScript code is not easy to maintain and update, and its reusability is low, so it is not suitable for the development of large projects.
Generally speaking, we recommend storing JavaScript code in external files to improve the maintainability and reusability of the code; internal JavaScript code is used to implement simple functions or for certain specific needs. .
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