我想在单击按钮时创建小时、分钟和秒的倒计时器。这是我到目前为止的代码。
HTMLcode
<div class="colomn" style="margin-right: 20px">
<button class="start" onclick="clock();">Start</button>
</div>
JavaScript 函数
<script>
var myTimer;
function clock() {
myTimer = setInterval(myClock, 1000);
var c = 5;
function myClock() {
document.getElementById("demo").innerHTML = --c;
if (c == 0) {
clearInterval(myTimer);
}
}
}
</script>
这很简单，不显示单独的小时、分钟和秒。我如何应用它来计算小时、分钟和秒。请帮我。
工作代码：
<!DOCTYPE HTML>
<html>
<body>
<p id="demo"></p>
<button onclick="countdownTimeStart()">Start Timer</button>
<script>
// Set the date we're counting down to
function countdownTimeStart(){
var countDownDate = new Date("Sep 25, 2025 15:00:00").getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays date and time
var now = new Date().getTime();
// Find the distance between now an the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Output the result in an element with id="demo"
document.getElementById("demo").innerHTML = hours + "h "
+ minutes + "m " + seconds + "s ";
// If the count down is over, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);
}
</script>
</body>
</html>
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