How to add jQuery in JS file

Question

I have some code specific to sorting tables. Since the code is common in most pages I want to make a JS file which will have the code and all the pages using it can referen

Answer 1

var script = document.createElement('script');
script.src = 'https://code.jquery.com/jquery-3.4.1.min.js';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);