MockTheClock/example_customclock.html at master · zb3/MockTheClock · GitHub

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<!DOCTYPE html>
<html>

<!--
include this file as soon as possible, otherwise it may not work if the app manages to store references
to the original functions!
-->
<script src="js/MTC.js"></script>
<body>
Open JS console for fun :)<br>PS. make sure you don't run this file from a local filesystem, Workers can't be loaded from a local filesystem
</body>
<script id="workercode" type="text/plain">
//this will be executed in a Worker!

function sayHi() {
  console.log('I am executed in a Worker every second!', Date());
}
setInterval(sayHi, 1000);
</script>
<script>
MTC.toggleSpoofing(true);

var workerSource = document.getElementById('workercode').text;
var worker = new Worker(URL.createObjectURL(new Blob([workerSource], {type: 'text/javascript'})));

setInterval("console.log('local 1s interval', Date())", 1000);

function forwardClock(x) {
  MTC.setTime(Date.now()+x);
}

console.log('Type forwardClock(x) to... well, advance the clock by x ms :)');
</script>
</html>