External JavaScript File

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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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