export function guid() {
    var d = new Date().getTime();
    return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(
        /[xy]/g,
        function (c) {
            var r = (d + Math.random() * 16) % 16 | 0;
            d = Math.floor(d / 16);
            return (c == "x" ? r : (r & 0x7) | 0x8).toString(16);
        }
    );
}