JS 输入年份，再输入月份，弹出这个月有多少天？ 

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
    </body>
</html>
<script type="text/javascript">
    var nian = Number(prompt("请输入年份"));
    var yue = Number(prompt("请输入月份"));
        if(yue ==1 ||yue ==3 ||yue ==5 ||yue ==7 ||yue ==9||yue ==11 )
        {
            alert("31天");
        }
        else if(yue ==2)
        {
            
            if ( (nian % 4 == 0) && (nianfen % 100 != 0)) 
            {
                alert(nian+"瑞年"+"29天");
                
            }
            else if(!(nian % 400 == 0))
            {
                alert(nian+"瑞年"+"29天");
            }
            else
            {
                alert(nian+"平年"+"28天");
            }
        }
        else{
            alert("30天");
        }
</script>

 

posted @ 2018-04-10 09:30  韩凯  阅读(676)  评论(0)  编辑  收藏  举报