Load javascript and css from javascript

load_js.js

  function loadjscssfile(filename, filetype){
    if (filetype=="js") { //if filename is a external JavaScript file
        var fileref=document.createElement('script');
        fileref.setAttribute("type","text/javascript");
        fileref.setAttribute("src", filename);
    }
    else if (filetype=="css") { //if filename is an external CSS file
        var fileref=document.createElement("link");
        fileref.setAttribute("rel", "stylesheet");
        fileref.setAttribute("type", "text/css");
        fileref.setAttribute("href", filename);
    }
    if (typeof fileref!="undefined") {
      document.getElementsByTagName("head")[0].appendChild(fileref);
    }
        
}

// Javascript
loadjscssfile("includes/templates/<template>/jscript/jquery.plugin.min.js", "js");

// CSS
loadjscssfile("https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css", "css");