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subzey/index.html

Created May 19, 2021 10:26
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rAF fps
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index.html
<!doctype html>
<html>
<head><title>rAF fps</title></head>
<body>
<output id="fps"></output>
<script>
const outputText= document.querySelector('#fps').appendChild(document.createTextNode(''));
let prev = -Infinity;
let count = 0;
requestAnimationFrame(function frame(now) {
requestAnimationFrame(frame);
const diff = now - prev;
count++;
if (diff >= 1000) {
outputText.nodeValue = (count / (now - prev) * 1000).toFixed(2);
count = 0;
prev = now;
}
});
</script>
</body>
</html>
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