console 命令行工具 X clear

console

function isLeapYear(year){
				if(year%4==0&&year%100!=0||year%400==0){
					document.write(year+"是闰年<br/>")
				}else{
					document.write(year+"不是闰年<br/>")
				}
            }
var year = isLeapYear(2020);
var year = isLeapYear(2000);
var year = isLeapYear(2001);

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
            function isLeapYear(year){
				if(year%4==0&&year%100!=0||year%400==0){
					document.write(year+"是闰年<br />")
				}else{
					document.write(year+"不是闰年")
				}
                var year = isLeapYear(2020);
                var year = isLeapYear(2000);
                var year = isLeapYear(2001);
            }
				
		</script>
	</body>
</html>