Claim:
Enter a year to determine whether it is a leap year (leap year: a year that is divisible by 4 and not divisible by 100 or divisible by 400)
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
// 利用函数判断闰年
function isRunYear(year) {
// 是闰年返回true,否则返回false
var flag = false;
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
flag = true;
}
return flag;
}
var year = Number(prompt('请输入年份：'));
alert(isRunYear(year));
</script>
</body>
</html>