Date对象常见使用

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内置对象Date的常见用法

一、倒计时天数

<span style="font-size:18px;">window.onload=function(){        var a=new Date();        var b=new Date("2016,6,7");        var lefttime=Math.ceil((b.getTime()-a.getTime())/(24*60*60*1000));        document.getElementById('show').innerHTML=lefttime;    };</span>

二、抢时限

<span style="font-size:18px;"> function showTime(){        var a=new Date();        var b=new Date("2016/6/7,12:20:12");        var lefttime=parseInt((b.getTime()-a.getTime())/1000);//秒        var d=parseInt(lefttime/(24*60*60));//天        var h=parseInt(lefttime/(60*60)%24);//时        var m=parseInt(lefttime/60%60);        var s=parseInt(lefttime%60);        document.getElementById('show').innerHTML=d+'天'+h+'小时'+m+'分'+s+'秒';        setInterval(showTime,500);    }</span>

三、显示时间

<span style="font-size:18px;">function check(i){                if (i<10) {                    return '0'+i;                } else {                    return i;                }            }        function showTime(){            var myDate=new Date();            var year=myDate.getFullYear();            var month=myDate.getMonth()+1;            var date=myDate.getDate();//日            var w=myDate.getDay();//星期            var h=myDate.getHours();            var m=myDate.getMinutes();            var s=myDate.getSeconds();            var week=new Array(7);            m=check(m);            h=check(h);            s=check(s);            week[0]="星期日";            week[1]="星期一";            week[2]="星期二";            week[3]="星期三";            week[4]="星期四";            week[5]="星期五";            week[6]="星期六";            document.getElementById('show').innerHTML=year+'年'+month+'月'+date+'日'+week[w]+h+':'+m+':'+s;            setTimeout(showTime,500);        }</span>

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