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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Do some work for 500ms</title>
<script>
const milliseconds = 500;
const millisecondsPerBatch = 10;
const end = Date.now() + milliseconds;
window.total = 0;
let i = 0;
/**
* Do work for a set number of milliseconds, but only do the work in batches
* so the browser does not get unresponsive.
*/
function doWork() {
const batchEnd = Date.now() + millisecondsPerBatch;
// Do some work for a set amount of time.
while (Date.now() < end) {
// Do some kind of work that is non-deterministic to guard against optimizations.
window.total += Math.random();
i++;
// Check if a batch is done yet.
if (Date.now() > batchEnd) {
// Defer the rest of the work into a micro task. Keep on doing this until
// the total milliseconds have elapsed.
setTimeout(doWork, 0);
return;
}
}
}
doWork();
</script>
</head>
<body>
Do some work for 500ms.
</body>
</html>