Question

我有CountDown的这段代码，当我刷新页面时，它从一开始就是计数。即使经过多次更新，我仍要继续从到达的位置开始计数：我有CountDown的这段代码，当我刷新页面时，它从一开始就是计数。即使经过几次更新，我仍要继续从到达的位置开始计数：

// Set the date we're counting down to
function getTimeRemaining(endtime) {
  var t = Date.parse(endtime) - Date.parse(new Date());
  var seconds = Math.floor((t / 1000) % 60);
  var minutes = Math.floor((t / 1000 / 60) % 60);
  var hours = Math.floor((t / (1000 * 60 * 60)) % 24);
  var days = Math.floor(t / (1000 * 60 * 60 * 24));
  return {
    'total': t,
    'days': days,
    'hours': hours,
    'minutes': minutes,
    'seconds': seconds
  };
}

function initializeClock(id, endtime) {
  var clock = document.getElementById(id);
  var daysSpan = clock.querySelector('.days');
  var hoursSpan = clock.querySelector('.hours');
  var minutesSpan = clock.querySelector('.minutes');
  var secondsSpan = clock.querySelector('.seconds');

  function updateClock() {
    var t = getTimeRemaining(endtime);
    daysSpan.innerHTML = t.days;
    hoursSpan.innerHTML = ('0' + t.hours).slice(-2);
    minutesSpan.innerHTML = ('0' + t.minutes).slice(-2);
    secondsSpan.innerHTML = ('0' + t.seconds).slice(-2);
    if (t.total <= 0) {
      clearInterval(timeinterval);
    }
  }
  updateClock();
  var timeinterval = setInterval(updateClock, 1000);
}
var deadline = new Date(Date.parse(new Date()) + 15 * 24 * 60 * 60 * 1000);
initializeClock('clockdiv', deadline);

body {
  text-align: center;
  background: #ffffff;
  /*font-family: sans-serif;*/
  font-weight: 100;
}

h1 {
  color: #e5534c;
  font-weight: 900;
  font-size: 40px;
  margin: 40px 0px 20px;
  font-family: 'Cairo', sans-serif;
}

#clockdiv {
  font-family: sans-serif;
  color: #fff;
  display: inline-block;
  font-weight: 100;
  text-align: center;
  font-size: 30px;
}

#clockdiv>div {
  padding: 10px;
  border-radius: 3px;
  background: #e5534c;
  display: inline-block;
}

#clockdiv div>span {
  padding: 15px;
  border-radius: 3px;
  background: #515251;
  display: inline-block;
  font-family: 'Cairo', sans-serif;
}

.smalltext {
  padding-top: 5px;
  font-size: 16px;
  color: #fff;
  font-weight: 600;
  font-family: 'Cairo', sans-serif;
}

<!DOCTYPE HTML>
<html>

<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://fonts.googleapis.com/css?family=Cairo" rel="stylesheet">
</head>

<body>
  <h1>The remaining duration of the white Friday cuts</h1>
  <div id="clockdiv">
    <div>
      <span class="days"></span>
      <div class="smalltext">Day</div>
    </div>
    <div>
      <span class="hours"></span>
      <div class="smalltext">Hour</div>
    </div>
    <div>
      <span class="minutes"></span>
      <div class="smalltext">Minute</div>
    </div>
    <div>
      <span class="seconds"></span>
      <div class="smalltext">Second</div>
    </div>
  </div>
</body>

</html>

Answer 1

将deadline保存在sessionStorage中。

替换两行：

var deadline = new Date(Date.parse(new Date()) + 15 * 24 * 60 * 60 * 1000);
initializeClock('clockdiv', deadline);

与此：

var deadline;
var savedDeadline = sessionStorage.getItem("deadline");
if (savedDeadline) {
    deadline = parseInt(savedDeadline);
} else {
    deadline = new Date(Date.parse(new Date()) + 15 * 24 * 60 * 60 * 1000);
    sessionStorage.setItem("deadline", deadline);
}
initializeClock('clockdiv', deadline);

刷新倒数计时时出错，重新启动

1 个答案: