how to link external javascript code example
Example 1: include script in html
<script type="text/javascript" src="/path/to/script.js"></script>
Example 2: linking a script .js
<script type="text/javascript" src="path-to-javascript-file.js"></script>
Example 3: how to link js to html
<script src="Your-JavaScript-File.js"></script>
Example 4: how to include external javascript in html
<script src="script.js">
Example 5: link external file by url using javascript
$('head').append('<link rel="stylesheet" type="text/css" href="{url}">')