js时间读秒

 function RemainTime()
    {
        var iDay,iHour,iMinute,iSecond;
        if (iTime >= 0)
        {
            iDay = parseInt(iTime/24/60/60/1000);
            iHour = parseInt(iTime /60/60/1000-iDay*24);
            iMinute = parseInt((iTime /(60*1000)) - iDay*24*60 - iHour*60);
            iSecond = parseInt((iTime-iDay*24*60*60*1000-iHour*60*60*1000-iMinute*60*1000)/1000);
            if(iTime==0){
                clearTimeout(Account);
            }
            else
            {
                Account = setTimeout("RemainTime()",1000);
                iTime=iTime-1000;
            }
            if(document.getElementById("remainTimeSpan")!=null){
                document.getElementById("remainTimeSpan").innerHTML = "剩余时间："+iDay+"天"+iHour+"小时"+iMinute+"分钟"+iSecond+"秒";
            }
        }
    }