4.10 pm例题

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>无标题文档</title>
        <style type="text/css">
            
        </style>
    </head>
    
    <body>
        <!--<span id="s"></span>-->
        <select id="nian" onclick="Bian()"></select><select id="yue"  onclick="Bian()"></select><select id="ri"></select></body>
    <script type="text/javascript">
        /*function S()
        {
            var d = new Date();
            //年
            var n = d.getFullYear();
            //月
            var y = d.getMonth()+1;
            //日
            var r = d.getDate();
            //小时
            var x = d.getHours();
            //分钟
            var m = d.getMinutes();
            //秒数 
            var s = d.getSeconds();
            var str = n+"年"+y+"月"+r+"日"+x+"时"+m+"分"+s+"秒";
            document.getElementById("s").innerHTML = str;
        }       
        window.setInterval("S()",0);*/
        
        Nian();
        Yue();
        Tian();
        //补充年份
        function Nian()
        {
            //获取当前日期
            var d = new Date();
            var n = parseInt(d.getFullYear());
            var str = "";
            for(var i=n-5;i<n+6;i++)
            {
                if(i==n)
                {
                    str += "<option selected='selected'>"+i+"</option>";        
                }
                else
                {
                    str += "<option>"+i+"</option>";    
                }
                    
            }
            document.getElementById("nian").innerHTML = str;
        }
        
        //补充月份
        function Yue()
        {
            var d = new Date();
            var y = parseInt(d.getMonth()+1);    
            var str = "";
            for(var i=1;i<13;i++)
            {
                if(i==y)
                {
                    str += "<option selected='selected'>"+i+"</option>";        
                }
                else
                {
                    str += "<option>"+i+"</option>";    
                }
            }
            document.getElementById("yue").innerHTML = str;
        }
        
        //补充天数
        function Tian()
        {
            var d = new Date();
            var t = parseInt(d.getDate());
            var n = document.getElementById("nian").value;    
            var y = document.getElementById("yue").value;
            //alert(n);
            var ts = 31;
            //30天
            if(y==4 || y==6 || y==9 || y==11)
            {
                ts = 30;    
            }
            
            //29或28
            if(y==2)
            {
                if((n%4==0 && n%100!=0) || n%400==0)
                {
                    ts=29;    
                }    
                else
                {
                    ts=28;    
                }
            }
            var str = "";
            for(var i=1;i<ts+1;i++)
            {
                if(i==t)
                {
                    str += "<option selected='selected'>"+i+"</option>";        
                }
                else
                {
                    str += "<option>"+i+"</option>";    
                }
            }
            document.getElementById("ri").innerHTML = str;
        }
        function Bian()
        {
            //
            Tian();    
        }
    </script>
</html>

  这是这个例题的最终效果,他可以选择一个年限内的年份,而且月份可以随着年份的变化而变换,日也是。

posted @ 2018-04-15 08:58  峰栯  阅读(125)  评论(0编辑  收藏  举报