JS实现的仿淘宝交易倒计时效果

<script type="text/javascript">
var StartTime = new Date("2015/11/11 12:34:03");
document.write("订购时间: " + StartTime.toLocaleDateString() + StartTime.toLocaleTimeString() + "<br/>");
var CurrentTime = new Date();
document.write("当前时间: " + CurrentTime.toLocaleDateString() + CurrentTime.toLocaleTimeString() + "<br/>");
var EndTime=StartTime.getTime() + 15*24*60*60*1000;//约定订购时间15天后关闭交易
EndTime = new Date(EndTime);
document.write("结束时间: " + EndTime.toLocaleDateString() + EndTime.toLocaleTimeString() + "<br/>");
var TempTime = StartTime;
var nMS,nD,nH,nM,nS;
function ShowCloseTime(){  
  var oDate = new Date();
  nMS=EndTime-oDate ;  
  nD=Math.floor(nMS/(1000*60*60*24));
  nH=Math.floor(nMS/(1000*60*60)) % 24 ;
  nM=Math.floor(nMS/(1000*60)) % 60;
  nS=Math.floor(nMS/1000) % 60;  
  document.getElementById("CloseTime").innerHTML = ("您还有" + nD + "天" + nH + "小时" + nM + "分" + nS + "秒完成交易");
  if (nS<0 || nM<0 || nH<0 || nD<0)
  {
    document.getElementById("CloseTime").innerHTML = "交易因超过15天,已被系统自动关闭"
    clearInterval(CloseTimer);
  }
}
var CloseTimer = window.setInterval("ShowCloseTime()",1000) 
</script>
<div id="CloseTime"></div>