如何让我的jQuery倒计时代码工作

Question

这是我的网站的一个简单的jQuery倒计时代码，它应该倒计时到2019年4月1日午夜。下面是jQuery和HTML代码的相关部分。问题是计时器在运行后不计时。任何关于这个问题的建议和纠正下面代码片段中的代码的方法都将对我有很大的帮助。

​

function makeTimer() {

  var endTime = new Date("01 April 2019 9:56:00 GMT+01:00");			
  endTime = (Date.parse(endTime) / 1000);

  var now = new Date();
  now = (Date.parse(now) / 1000);

  var timeLeft = endTime - now;

  var days = Math.floor(timeLeft / 86400); 
  var hours = Math.floor((timeLeft - (days * 86400)) / 3600);
  var minutes = Math.floor((timeLeft - (days * 86400) - (hours * 3600 )) / 60);
  var seconds = Math.floor((timeLeft - (days * 86400) - (hours * 3600) - (minutes * 60)));

  if (hours < "10") { hours = "0" + hours; }
  if (minutes < "10") { minutes = "0" + minutes; }
  if (seconds < "10") { seconds = "0" + seconds; }

  $(".days").html(days + "<br><span>days</span>");
  $(".hours").html(hours + "<br><span>hours</span>");
  $(".minutes").html(minutes + "<br><span>minutes</span>");
  $(".seconds").html(seconds + "<br><span>seconds</span>");		

}

setInterval(function() { makeTimer(); }, 1000);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

  <div class="row countdown-box" style="top: 0px">
  <div class="col-md-3">
    <div class="row">
      <div class="col-md-6">
        <h2 id="countdown" class="days">24<br>                        <span>days</span></h2>
      </div>

      <div class="col-md-6">
        <h2 id="countdown">:</h2>
      </div>
    </div>
  </div>

  <div class="col-md-3">
    <div class="row">
      <div class="col-md-6">
        <h2 id="countdown" class="hours">06<br><span>hours</span></h2>
      </div>

      <div class="col-md-6">
        <h2 id="countdown">:</h2>
      </div>
    </div>
  </div>

  <div class="col-md-3">
    <div class="row">
      <div class="col-md-6">
        <h2 id="countdown" class="minutes">22<br><span>minutes</span></h2>
      </div>

      <div class="col-md-6">
        <h2 id="countdown">:</h2>
      </div>
    </div>
  </div>

  <div class="col-md-3">
    <div class="row">
      <div class="col-md-12">
        <h2 id="countdown" class="seconds">59<br><span>seconds</span></h2>
      </div>
    </div>
  </div>
  </div>

​

Answer 1

不需要在setInterval中创建额外的函数，只需传递函数名

setInterval(makeTimer, 1000)

固定html

function makeTimer() {

  var endTime = new Date("01 April 2019 9:56:00 GMT+01:00");			
  endTime = (Date.parse(endTime) / 1000);

  var now = new Date();
  now = (Date.parse(now) / 1000);

  var timeLeft = endTime - now;

  var days = Math.floor(timeLeft / 86400); 
  var hours = Math.floor((timeLeft - (days * 86400)) / 3600);
  var minutes = Math.floor((timeLeft - (days * 86400) - (hours * 3600 )) / 60);
  var seconds = Math.floor((timeLeft - (days * 86400) - (hours * 3600) - (minutes * 60)));

  if (hours < "10") { hours = "0" + hours; }
  if (minutes < "10") { minutes = "0" + minutes; }
  if (seconds < "10") { seconds = "0" + seconds; }

  $(".days").html(days + "<br><span>days</span>");
  $(".hours").html(hours + "<br><span>hours</span>");
  $(".minutes").html(minutes + "<br><span>minutes</span>");
  $(".seconds").html(seconds + "<br><span>seconds</span>");		

}

setInterval(makeTimer, 1000);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

  <div class="row countdown-box" style="top: 0px">
  <div class="col-md-3">
    <div class="row">
      <div class="col-md-6">
        <h2 id="countdown" class="days">24<br>                        <span>days</span></h2>
      </div>

      <div class="col-md-6">
        <h2 id="countdown">:</h2>
      </div>
    </div>
  </div>

  <div class="col-md-3">
    <div class="row">
      <div class="col-md-6">
        <h2 id="countdown" class="hours">06<br><span>hours</span></h2>
      </div>

      <div class="col-md-6">
        <h2 id="countdown">:</h2>
      </div>
    </div>
  </div>

  <div class="col-md-3">
    <div class="row">
      <div class="col-md-6">
        <h2 id="countdown" class="minutes">22<br><span>minutes</span></h2>
      </div>

      <div class="col-md-6">
        <h2 id="countdown">:</h2>
      </div>
    </div>
  </div>

  <div class="col-md-3">
    <div class="row">
      <div class="col-md-12">
        <h2 id="countdown" class="seconds">59<br><span>seconds</span></h2>
      </div>
    </div>
  </div>
  </div>

​

Answer 2

当您在HTML中执行所有使用ID类型时，您在jquery中传递了.<class>选择器。我建议您改用以下代码：

$("#days").html(days + "<br><span>days</span>");
$("#hours").html(hours + "<br><span>hours</span>");
$("#minutes").html(minutes + "<br><span>minutes</span>");
$("#seconds").html(seconds + "<br><span>seconds</span>");