例子，js日期与时间精确显示代码。
<!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>js精确显示日期与时间--www.jb200.com</title>
<script defer language="javascript" type="text/javascript">
function myfun()
{
document.write("我是神！");
}
function isLeapYear(year)
{
if((year %4==0 && year %100!=0) || (year %400==0)) return true;
else return(false);
}
function checkShow(tmpChar)
{
if(tmpChar<10)tmpChar='0'+tmpChar;
}
var year = 2001;
var month = 10;
var mday = 30;
var hour = 23;
var minute = 59;
var second = 50;
var pyear = year;
var pmonth=month;if(month<10)pmonth='0'+month;
var pmday=mday;if(mday<10)pmday='0'+pmday;
var phour=hour;if(hour<10)phour='0'+hour;
var pminute=minute;if(minute<10)pminute='0'+minute;
var psecond=second;if(second<10)psecond='0'+second;
function jugFun(month)
{
switch(month)
{
case 1:standerDay=31;break;
case 2:if(isLeapYear(year) == true)standerDay=29;else standerDay=28;break;
case 3:standerDay=31;break;
case 4:standerDay=30;break;
case 5:standerDay=31;break;
case 6:standerDay=30;break;
case 7:standerDay=31;break;
case 8:standerDay=31;break;
case 9:standerDay=30;break;
case 10:standerDay=31;break;
case 11:standerDay=30;break;
case 12:standerDay=31;break;
default :break;
}
return standerDay;
}
//standerDay=jugFun(month);
//document.write(standerDay);
function showtime()
{
document.getElementById("myBody").innerHTML=pyear+'年'+pmonth+'月'+pmday+'日'+' '+phour+'时'+pminute+'分'+psecond+'秒';
second=second+1;
if(second<10)psecond='0'+second;
else if(second<60)psecond=second;
else
{
second=0;psecond="00";
minute=minute+1;
if(minute<10)pminute='0'+minute;
else if(minute<60)pminute=minute;
else
{
minute=0;pminute="00";
hour=hour+1;
if(hour<10)phour='0'+hour;
else if(hour<24)phour=hour;
else
{
hour=0;phour="00";
mday=mday+1;
if(mday<10)pmday='0'+mday;
else if(mday<jugFun(month)+1)pmday=mday;
else
{
mday=0;pmday="01";
month=month+1;standerDay=jugFun(month);
if(month<10)pmonth='0'+month;
else if(month<13)pmonth=month;
else
{
month=0;pmonth="01";
year=year+1;
}
}
}
}
}
setTimeout(showtime,1000);
}
</script>
</head>
<body id="myBody" onload="showtime()">
</body>
</html>