simulated Loading, trigger favicon loading

simulateloading.js

    var oldDone = Nprogress.done;
    Nprogress.done = function(){
        var setfmSrc = function(dom, url){
            dom.src = url;
        };
        var fm = document.getElementById('triggerloading');
        var url = "/favicon.ico"; // ping page;
        if(fm){
            setfmSrc(fm, url);
        } else{
            fm = document.createElement('iframe'); 
            fm.id = "triggerloading"; 
            fm.className="sr-only"; 
            document.body.appendChild(fm);
            setfmSrc(fm, url);
        }
        oldDone();
    }