asyncScriptsLoad.js

var cont = document.getElementsByTagName('head')[0];

var jsList = [
    {src: '/static/inner/js/libs.js', async: true, defer: true},
    {src: '/local/templates/inner/assets-prog/dist/script.min.js', async: true, defer: true},
    {
        src: 'https://maps.googleapis.com/maps/api/js?libraries=places&key=YOUR_API_KEY',
        onLoad: function () {
            setTimeout(function () {
                $(window).trigger('google:map:ready');
            }, 500);
        }
    },
    'https://apis.google.com/js/client.js?onload=initPicker',
    {
        src: 'https://www.dropbox.com/static/api/2/dropins.js',
        attributes: {'id': 'dropboxjs', 'data-app-key': 'YOUR_APP_KEY'}
    }
];
function loadScript(i) {
    i = i || 0;
    var js = document.createElement('script');
    if (typeof jsList[i] === 'object') {
        js.src = jsList[i].src;
        js.async = jsList[i].async || false;
        js.defer = jsList[i].defer || false;
        if (typeof jsList[i].attributes === 'object') {
            for (var attr in jsList[i].attributes) {
                if (jsList[i].attributes.hasOwnProperty(attr)) {
                    js.setAttribute(attr, jsList[i].attributes[attr]);
                }
            }
        }
    } else if (typeof jsList[i] === 'string') {
        js.src = jsList[i];
    } else {
        return null;
    }
    cont.appendChild(js);
    js.onload = function () {
        loadScript(i + 1);
        if (typeof jsList[i].onLoad === 'function') {
            jsList[i].onLoad();
        }
    };
}
loadScript();