function dynamicallyLoadScript(url) {
var script = document.createElement("script");
script.src = url;
document.head.appendChild(script);
}
dynamicallyLoadScript('https://cdnjs.cloudflare.com/ajax/libs/mark.js/8.11.1/jquery.mark.es6.min.js')
ref:
How do I include a JavaScript file in another JavaScript file? – Stack Overflow