We would like to know how to check if a year is leap year.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
function isleap(year) {<!-- w w w .ja va 2s. c om-->
year = parseInt(year,10);
if (isNaN(year)) {
document.writeln("Not a number");
return false;
}
if (year%4===0 && (year%100!=0 || year%400===0)) {
document.writeln("Leap");
return true;
} else {
document.writeln("Not leap");
return false;
}
}
</script>
</head>
<body>
<button onclick="isleap(1992)">Try it</button>
</body>
</html>
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