JS Countdown计时器到特定日期

Question

我有一个js倒计时器，目前从33天开始倒计时，每次页面重新加载时重启。我想改变它，所以它倒计时到16/01/2017，因此每次加载页面时都不会重置为相同的数量。

我已经尝试将截止日期变量设置为'12 / 01/2017'，但我在倒计时方格中得到'Na'。

感谢。

$(document).ready(function() {

function getTimeRemaining(endtime) {
  var t = endtime - new Date().getTime();
  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(new Date().getTime() + 33 * 24 * 60 * 60 * 1000);
initializeClock('clockdiv', deadline);

});

#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: #00BF96;
    display: inline-block;
}

#clockdiv div > span{
    padding: 15px;
    border-radius: 3px;
    background: #00816A;
    display: inline-block;
}

.smalltext{
    padding-top: 5px;
    font-size: 16px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="clockdiv">
  <div>
    <span class="days"></span>
    <div class="smalltext">Days</div>
  </div>
  <div>
    <span class="hours"></span>
    <div class="smalltext">Hours</div>
  </div>
  <div>
    <span class="minutes"></span>
    <div class="smalltext">Minutes</div>
  </div>
  <div>
    <span class="seconds"></span>
    <div class="smalltext">Seconds</div>
  </div>
</div>

Answer 1

$(document).ready(function() {

function getTimeRemaining(endtime) {
  var t = endtime - new Date().getTime();
  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 = Date.parse('Jan 16, 2017');
initializeClock('clockdiv', deadline);

});

#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: #00BF96;
    display: inline-block;
}

#clockdiv div > span{
    padding: 15px;
    border-radius: 3px;
    background: #00816A;
    display: inline-block;
}

.smalltext{
    padding-top: 5px;
    font-size: 16px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="clockdiv">
  <div>
    <span class="days"></span>
    <div class="smalltext">Days</div>
  </div>
  <div>
    <span class="hours"></span>
    <div class="smalltext">Hours</div>
  </div>
  <div>
    <span class="minutes"></span>
    <div class="smalltext">Minutes</div>
  </div>
  <div>
    <span class="seconds"></span>
    <div class="smalltext">Seconds</div>
  </div>
</div>

实际变化如下。

var deadline = new Date(new Date('01 16 2017').getTime());

请注意，new Date('01 16 2017')值应为用户的本地化日期格式。否则，您将获得NaN。

修改1

使用Date.parse（mmm dd，yyyy）来解析日期字符串而不必担心本地化。

var deadline = Date.parse('Jan 16, 2017');