<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script type="text/javascript">
        //定义函数
        function isLeapYear(year)
        {
            //判断闰年的条件
            if((year%4==0)&&(year%100!=0)||(year%400==0))
            {
                return year+"年是闰年";
            }
            else
            {
                return year+"年不是闰年";
            }
        }
        //调用函数
        document.write(isLeapYear(2015));
    </script>
</head>
<body>
</body>
</html>