insertScripts in console

insertScripts.js

(function insertScripts(src) {
    if (src instanceof Array && src.length) {
        insertScripts(src.shift())
        return insertScripts(src);
    }
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = src;
    document.head.appendChild(script);
})([
    '//code.jquery.com/jquery-1.11.0.min.js',
    '//code.jquery.com/jquery-migrate-1.2.1.min.js'
]);

loadGoogleMap.js

(function loadGoogleMap(callback) {
    if ((typeof google != 'undefined') && google.maps && google.maps.version) {return callback && callback();}
    var callbackName = ['google_map_initialize', new Date().getTime()].join('_')
    window[callbackName] = callback || function() {};
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'https://maps.googleapis.com/maps/api/js?v=3.exp&callback=' + callbackName;
    document.body.appendChild(script);
})(function() {
    // initialize here
    console.log('Google Map loaded')
});

loadJsCss.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
    
        if (document.createStyleSheet) { //IE8 ONLY
            document.createStyleSheet(filename);
        } else {
            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)
}

loadjscssfile("myscript.js", "js") //dynamically load and add this .js file
loadjscssfile("javascript.php", "js") //dynamically load "javascript.php" as a JavaScript file
loadjscssfile("mystyle.css", "css") ////dynamically load and add this .css file