按小时\分钟而不是秒计算倒计时

Question

我正在尝试使用这个倒计时，但它每秒都在计算时间。我想按分钟甚至小时来计算时间，而不是每秒，因为我只显示天数和小时数。

我已经尝试删除 var seconds 或 minutes，但检查元素显示计时器每 1 秒闪烁一次，这意味着它仍在按秒计算时间。

<!DOCTYPE HTML>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
p {
  text-align: center;
  font-size: 60px;
  margin-top:0px;
}
</style>
</head>
<body>

<p id="demo"></p>

<script>
// Set the date we're counting down to
var countDownDate = new Date("April 24, 2018 15:37:25").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 days = Math.floor(distance / (1000 * 60 * 60 * 24));
    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 = days + "d " + hours + "h ";
    
    // If the count down is over, write some text 
    if (distance < 0) {
        clearInterval(x);
        document.getElementById("demo").innerHTML = "EXPIRED";
    }
}, 1000);
</script>

</body>
</html>

Answer 1

改变

// Update the count down every 1 second
var x = setInterval(function() {
...
}, 1000);

至

// Update the count down every 1 minute
var x = setInterval(function() {
...
}, 1000*60);

或

// Update the count down every 1 hour
var x = setInterval(function() {
...
}, 1000*60*60);

编辑

这将每隔 minute/hour 更新您的计时器。现在，开始倒计时并更新每个 minute/hour:

calculateCountdown();
// Update the count down every 1 minute
var x = setInterval(function() {
  calculateDountdown();
}, 1000*60);

或者只是

calculateCountdown();
setInterval(calculateCountdown, 1000*60);

哪里

function calculateCountdown() {
  // 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 days = Math.floor(distance / (1000 * 60 * 60 * 24));
    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 = days + "d " + hours + "h ";

    // If the count down is over, write some text 
    if (distance < 0) {
        clearInterval(x);
        document.getElementById("demo").innerHTML = "EXPIRED";
    }
}

检查此 answer 以了解如何将基于 setInterval 的解决方案重构为基于 setTimeout 的解决方案。

按小时\分钟而不是秒计算倒计时

Calculating countdown by hours \ minutes instead of seconds

javascript

time

countdown