我有一个倒计时功能(代码如下),它很小并且与左上角对齐。
我希望能够自定义大小、对齐方式、背景颜色、前景色,并且还有一个按钮来停止、启动和清除计时器。其次,我希望计数器在开始时显示“00:00:00”,当它达到“00:00:59”时,我希望它翻转到“00:01:00”,显示 1 分钟有通过了。
我认为 CSS/HTML 将是最合适的语言来实现所需的视觉效果,但 Javascript 似乎具有更多的算术/解析功能。
<br><script language="JavaScript">
function calcage(secs, num1, num2) {
s = ((Math.floor(secs/num1))%num2).toString();
if (LeadingZero && s.length < 2) {
s = "0" + s;
return "<b>" + s + "</b>";
}
}
function CountBack(secs) {
if (secs < 0) {
document.getElementById("cntdwn").innerHTML = FinishMessage;
return;
}
DisplayStr = DisplayFormat.replace(/%%D%%/g,calcage(secs,86400,100000));
DisplayStr = DisplayStr.replace(/%%H%%/g, calcage(secs,3600,24));
DisplayStr = DisplayStr.replace(/%%M%%/g, calcage(secs,60,60));
DisplayStr = DisplayStr.replace(/%%S%%/g, calcage(secs,1,60));
document.getElementById("cntdwn").innerHTML = DisplayStr;
if (CountActive) {
setTimeout("CountBack(" + (secs+CountStepper) + ")", SetTimeOutPeriod);
}
}
function putspan(backcolor, forecolor) {
document.write("<span id='cntdwn' style='background-color:" + backcolor + "; color:" + forecolor + "'></span>");
}
if (typeof(BackColor)=="undefined") {
BackColor = "black";
}
if (typeof(ForeColor)=="undefined") {
ForeColor= "white";
}
if (typeof(TargetDate)=="undefined") {
TargetDate = "12/31/2050 5:00 AM";
}
if (typeof(DisplayFormat)=="undefined") {
DisplayFormat = "%%H%%:%%M%%:%%S%%";
}
if (typeof(CountActive)=="undefined") {
CountActive = true;
}
if (typeof(FinishMessage)=="undefined") {
FinishMessage = "";
}
if (typeof(CountStepper)!="number") {
CountStepper = -1;
}
if (typeof(LeadingZero)=="undefined") {
LeadingZero = true;
}
CountStepper = Math.ceil(CountStepper);
if (CountStepper == 0) {
CountActive = false;
}
var SetTimeOutPeriod = (Math.abs(CountStepper)-1)*1000 + 990;
putspan(BackColor, ForeColor);
var dthen = new Date(TargetDate);
var dnow = new Date();
if(CountStepper>0) {
ddiff = new Date(dnow-dthen);
}
else {
ddiff = new Date(dthen-dnow);
}
gsecs = Math.floor(ddiff.valueOf()/1000);
CountBack(gsecs);
</script>