Search notes:
JavaScript: Math.round()
Math.round(n) rounds n. Unfortunately, it's not possible to easily round to an arbitrary number of decimal places.
<!DOCTYPE html>
<html>
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<title>Math.round</title>
<script type="text/javascript">
function main() {
var out = document.getElementById('out');
out.innerHTML += Math.round( 2.0001) + "<br>"; // 2
out.innerHTML += Math.round( 2.5 ) + "<br>"; // 3
out.innerHTML += Math.round( 2.49 ) + "<br>"; // 2
out.innerHTML += Math.round(-1.8 ) + "<br>"; // -2
}
</script>
</head>
<body onload='main()';>
<div id='out'></div>
</body>
</html>