quick paste for adding JS into a page by a list of script URLs
function inject_scripts(scripts, selector){
if (typeof selector === "undefined")
selector = 'head';
var parent_el=document.querySelector(selector);
for (var i =0 ; i < scripts.length; i++){
var src = scripts[i];
var script = document.createElement('script');
script['src'] = src;
parent_el.appendChild(script);
}
}
var scripts = [
"https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js",
];
inject_scripts(scripts);
//inject_scripts(scripts, 'body');