Get a unique device ID in javascript

 Okay, first for try to make pwa apps, and result isn't hard to me. so today i have case how to get unique id forom every devices. its work for auto login or make session devices. so let's go..

you just add

<script src="https://raw.githubusercontent.com/biggora/device-uuid/master/lib/device-uuid.min.js"></script>

and add this before </body> 

   
    <script>
        var uuid = new DeviceUUID().get();
        document.getElementById("uuid").innerHTML = uuid;
    </script>

and 

<div id="uuid"></div>

on you page