js 倒计时

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突然想到的
<!DOCTYPE html><html>    <head>        <meta charset="UTF-8">        <title>js倒计时</title>    </head>    <body>        <div id="newdata"></div>        <div id="olddata"></div>    </body></html><script>    function show(){        setInterval(function(){            var odata = new Date();            var oyears = odata.getFullYear();             var omonth = odata.getMonth()+1;            var oday = odata.getDate();            var ohours = odata.getHours();            var ominutes = odata.getMinutes();            var oseconds = odata.getSeconds();            //时间表            document.getElementById('newdata').innerHTML = oyears +'-'+ omonth+'-'+oday+'   '+ohours+':'+ominutes+':'+oseconds ;            //倒计时            var amonth = 12-omonth; //          var arr = new Array();  本来打算把每月的天数存放到数组里            var days = 0;            if(omonth == 1||omonth == 3||omonth == 5||omonth == 7||omonth ==8||omonth == 10||omonth == 12){                days = 31;            }else if(omonth == 2){                if(oyears%4 == 0&&oyears%100!=0&&oyears%400==0){ //四年一闰百年不闰四百年又闰                    days = 29;                }else{                    days =28;                }            }else{                days = 30;            }            var aday = days-oday;            var ahours = 24-ohours;            var amintes = 60-ominutes;            var aseconds = 60-oseconds;            document.getElementById('olddata').innerHTML = '倒计时：'+oyears +'年还剩'+ amonth+'个月'+aday+'天'+ahours+'小时'+amintes+'分钟'+aseconds +'秒';        },1000);    }    show();</script>
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