用JavaScript判断某个时间距离现在是几秒或几分或几小时等等的效果

Posted 2023-03-18

用javascript判断某个时间距离现在是几秒或几分或几小时等等的效果，或者从数据库里，服务器后台装换得到。应该是用JavaScript的性能更好吧。。
不是倒计时，像优酷视频，是几天前发布的显示几天，几分钟显示几分钟，然后只有秒就显示秒，年月日，不是全显示。我看看这个好像可以改改，先看看

参考技术A javascript取到的是"打开当前网页的计算机的当前时间"(强烈建议不要使用).
从服务器后台取到的才是准确的时间.

<script language="JavaScript">
<!--
var d1 = new Date();
d1.setYear(2009);//2009取自服务器端
d1.setMonth(3);//3取自服务器端
d1.setDate(26);//26取自服务器

var t1 = d1.getTime();

var t2 = new Date().getTime();
var oneDay = 1000*60*60*24;//一天的毫秒数
alert('两个日期相差 : '+Math.abs((t2-t1)/oneDay)+' 天');

//-->
</script> 参考技术B 倒计时？
精确到秒的javascript倒计时代码

html代码:

<form name="form1">
<div align="center" align="middle">
<center>离2010年还有:<br>
<input type="textarea" name="left" size="35" style="text-align: center">
</center>
</div>
</form>
<script LANGUAGE="javascript">
startclock()
var timerID = null;
var timerRunning = false;
function showtime()
Today = new Date();
var NowHour = Today.getHours();
var NowMinute = Today.getMinutes();
var NowMonth = Today.getMonth();
var NowDate = Today.getDate();
var NowYear = Today.getYear();
var NowSecond = Today.getSeconds();
if (NowYear <2000)
NowYear=1900+NowYear;
Today = null;
Hourleft = 23 - NowHour
Minuteleft = 59 - NowMinute
Secondleft = 59 - NowSecond
Yearleft = 2009 - NowYear
Monthleft = 12 - NowMonth - 1
Dateleft = 31 - NowDate
if (Secondleft<0)

Secondleft=60+Secondleft;
Minuteleft=Minuteleft-1;

if (Minuteleft<0)

Minuteleft=60+Minuteleft;
Hourleft=Hourleft-1;

if (Hourleft<0)

Hourleft=24+Hourleft;
Dateleft=Dateleft-1;

if (Dateleft<0)

Dateleft=31+Dateleft;
Monthleft=Monthleft-1;

if (Monthleft<0)

Monthleft=12+Monthleft;
Yearleft=Yearleft-1;

Temp=Yearleft+'年, '+Monthleft+'月, '+Dateleft+'天, '+Hourleft+'小时, '+Minuteleft+'分, '+Secondleft+'秒'
document.form1.left.value=Temp;
timerID = setTimeout("showtime()",1000);
timerRunning = true;

var timerID = null;
var timerRunning = false;
function stopclock ()
if(timerRunning)
clearTimeout(timerID);
timerRunning = false;

function startclock ()
stopclock();
showtime();

// -->
</script>本回答被提问者采纳