javaScript指定过去时间计算到现在过去了多少天、小时、秒_时间日期

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javaScript指定过去时间计算到现在过去了多少天、小时、秒，比如计算从你出生到目前为止，你已度过了多少天、多少小时、多少分钟、多少秒，计算出您的精彩人生！主要是练习用JS计算时间操作的，在平时，会有不少类似的求时间差的问题，但愿这个小小的JS特效可以为你提供帮助。

<HTML>
<HEAD><TITLE>计算您的精彩人生</TITLE>
</HEAD>
<BODY onload=showtime() background="temp.JPG"><BR><BR>
<script language="javascript">
	var biryear = prompt('请输入你的出生年份','1980');
	var birmonth = prompt('请输入你的出生月份','5');
	var birday = prompt('请输入你的出生日','30');
	var year = new Date();
	var getyear = year.getYear();
	TMonth = new Array('Jan','Feb','Mar','Apr','May','June','July','Aug','Sep','Oct','Nov','Dec');
	nowMonth = birmonth - 1;
	bmonth = TMonth[nowMonth];
	var timerid;
	var timerRunning = false;
	var today = new Date();
	var startday = new Date();
	var enday = new Date();
	var minPerDay = 0;
	var secsLeft = 0;
	var secsRound = 0;
	var secsRemain = 0;
	var minLeft = 0;
	var minRound = 0;
	var minRemain = 0;
	var timeRemain = 0;
	function showtime() 
	{
		startday = new Date(""+bmonth+" "+birday+", "+biryear+" 00:00 EDT");
		startday.setYear(""+biryear+"");
		today = new Date();
		secsPerDay = 1000 ;
		minPerDay = 60 * 1000 ;
		hoursPerDay = 60 * 60 * 1000;
		PerDay = 24 * 60 * 60 * 1000;
		secsLeft = (today.getTime() - startday.getTime()) / minPerDay;
		secsRound = Math.round(secsLeft);
		secsRemain = secsLeft - secsRound;
		secsRemain = (secsRemain < 0) ? secsRemain = 60 - ((secsRound - secsLeft) * 60) : secsRemain = (secsLeft - secsRound) * 60;
		secsRemain = Math.round(secsRemain);
		minLeft = ((today.getTime() - startday.getTime()) / hoursPerDay);
		minRound = Math.round(minLeft);
		minRemain = minLeft - minRound;
		minRemain = (minRemain < 0) ? minRemain = 60 - ((minRound - minLeft) * 60) : minRemain = ((minLeft - minRound) * 60);
		minRemain = Math.round(minRemain - 0.495);
		hoursLeft = ((today.getTime() - startday.getTime()) / PerDay);
		hoursRound = Math.round(hoursLeft);
		hoursRemain = hoursLeft - hoursRound;
		hoursRemain = (hoursRemain < 0) ? hoursRemain = 24 - ((hoursRound - hoursLeft) * 24)  : hoursRemain = ((hoursLeft - hoursRound) * 24);
		hoursRemain = Math.round(hoursRemain - 0.5);
		daysLeft = ((today.getTime() - startday.getTime()) / PerDay);
		daysLeft = (daysLeft - 0.5);
		daysRound = Math.round(daysLeft);
		daysRemain = daysRound;
		day_rem = " 天 >>> "
		hour_rem = " 小时 >>> "
		min_rem = " 分 >>> "
		sec_rem = " 秒"
		timeRemain = daysRemain + day_rem + hoursRemain + hour_rem + minRemain + min_rem + secsRemain + sec_rem;
		document.up.face.value = timeRemain;
		timerid = setTimeout("showtime()",1000);
		timerRunning = true;
	}
</script>      
</P>
<table width="400" height="50" border="1" align="center" cellpadding="4" cellspacing="3" bordercolor="#CCCCCC" bgcolor="#CCFF00">
    <tr>
      <td align="center" valign="middle" bgcolor="#FFFFFF" background="temp.bmp">
	  <FORM name=up onsubmit=1>
        <font size="5" color="#9966CC" face="华文行楷">从你出生到目前为止，你已度过了</font>
		<p>
        <INPUT size=46 value="计算出您的精彩人生！" name= "face">
      </FORM>
	  </td>
    </tr>
</table>
</BODY>
</HTML>

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javaScript指定过去时间计算到现在过去了多少天、小时、秒

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