JavaScript实现简易数字时钟倒计时功能

JavaScript简易数字时钟倒计时实现

实现逻辑非常直观，以下提供完整代码。用户可将代码保存为HTML文件并在浏览器中运行以查看效果。

<!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></head>
<body>
<script language="javascript">
function Change(HourSurplus,MinuteSurplus,SecondSurplus)
{
SecondSurplus = SecondSurplus - 1;
if (SecondSurplus<0)
 {  
SecondSurplus=60+SecondSurplus;
MinuteSurplus=MinuteSurplus-1;
 }  
if (MinuteSurplus<0)
 {   
MinuteSurplus=60+MinuteSurplus;
HourSurplus=HourSurplus-1;
 }
document.getElementById("asd").innerHTML=""+ HourSurplus +":"+ MinuteSurplus +":"+ SecondSurplus +"";
setTimeout(function() {
Change(HourSurplus,MinuteSurplus,SecondSurplus);
},1000);
}
</script>
<span id="asd">11111</span>
<script language="javascript">
Change(1,59,59);
</script>
</body>
</html>