js file load external script code example

Example 1: linking a script .js

<script type="text/javascript" src="path-to-javascript-file.js"></script>

Example 2: external javascript file not working

Most likely, the problem is that you are including your js file in a head tag or somewhere above your main content. ... You should be able to add the js file in a script tag. The page loads first then JavaScript. You need conditionals to load an external script if the JavaScript file is in the head tag.
<h1> asdlfasdjfd </h1>
<script type...... src='.....js'></script>