2008北京奥运倒计时代码解析-优快云博客

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<title>2008北京奥运会倒计时@阿良.NET</title>
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http://www.chenjiliang.com/Article/View.aspx?ArticleID=3465&TypeID=31*/
window.onload = OlympicCountdown;
function OlympicCountdown()
{
var futureDate = new Date(2008, 7, 8, 20);//开幕时间注意８月要减１，所以是7
var messageExceedTime="2008北京奥运会已经开幕";
var message = Countdown(futureDate, messageExceedTime);
document.getElementById("OlympicCountdownDiv").innerHTML = message;

if (message == messageExceedTime)
return;

setTimeout("OlympicCountdown()", 1000);
}

//倒计时，如果超出将来日期，返回messageExceedTime；否则返回倒计时间
function Countdown(futureDate, messageExceedTime)
{
var now = new Date();
if (now >= futureDate)
{
// alert(messageExceedTime);
return messageExceedTime;
}

var days = 0;
var hours = 0;
var minutes = 0;
var seconds = 0;

var total = futureDate.getTime() - now.getTime();
var x = 24 * 60 * 60 * 1000;
days = total / x;
days = Math.floor(days);

total = total % x;
x = 60 * 60 * 1000;
hours = total / x;
hours = Math.floor(hours);

total = total % x;
x = 60 * 1000;
minutes = total / x;
minutes = Math.floor(minutes);

total = total % x;
x = 1000;
seconds = total / x;
seconds = Math.floor(seconds);

var message = "";
if (days > 0)
message += days + "天";

if (hours > 0)
message += hours + "小时";
else
{
if (message != "")
message += "0小时";
}

if (minutes > 0)
message += minutes + "分";
else
{
if (message != "")
message += "0分";
}

if (seconds > 0)
message += seconds + "秒";
else
{
if (message != "")
message += "0秒";
}

// alert(message);
return message;
}
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