How to link external javascript file onclick of button

I have to agree with the comments above, that you can’t call a file, but you could load a JS file like this, I’m unsure if it answers your question but it may help… oh and I’ve used a link instead of a button in my example…

<a href="https://stackoverflow.com/questions/7789521/linkhref.html" id='mylink'>click me</a>

<script type="text/javascript">

var myLink = document.getElementById('mylink');

myLink.onclick = function(){

    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "Public/Scripts/filename.js."; 
    document.getElementsByTagName("head")[0].appendChild(script);
    return false;

}


</script>

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