External JavaScript File

The src attribute of the script tag is used to add or include external JavaScript files into any number of HTML files. It increases the code reusability.

Syntax:

<script type="text/javascript" src="external.js"></script>

First, create a JavaScript file and then save the file with the .js extension. After that, we can use the src attribute of the script tag to use this already-created file.

test.js

function show() {
alert("External JavaScript file.");
}
<html>
<body>
<form>
<input type="button" value="Show" onclick="show()"/>
</form>
<script src="test.js"></script>
</body>
</html>

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