在本地运行时，倒计时js时钟不起作用，但在jsfiddle上起作用

时间：2018-07-10 19:46:16

标签： javascript

*请注意，以下代码已完成复制和粘贴，我不知道js，但想将倒数时钟的这一功能添加到我的网站上（原始代码位于https://codepen.io/SitePoint/pen/MwNPVq）

这是代码（底部包含jsfiddle）

<head>
<script>
  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);

</script>
</head>
<body>
    <h1>Countdown Clock</h1>
    <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>
</body>

http://jsfiddle.net/mktc6q4n/

有人知道为什么这在我的浏览器中无法在本地工作吗？

4 个答案:

答案 0 :(得分：0)

这里的问题是，呈现HTML之前，您的JavaScript正在执行。您有2个解决此问题的方法

在<body>标签的末尾加载脚本标签，以便您可以复制此代码段

<body>
  <h1>Countdown Clock</h1>
  <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>
  <script>
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);
  </script>
</body>

等待直到DOM完全加载

<script>
  window.addEventListener("DOMContentLoaded", function () {
    // do stuff
  }, false);

</script>

因此，将其复制会使其正常工作

<head>
  <script>
    window.addEventListener("DOMContentLoaded", function () {
      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);
    }, false);

  </script>
</head>

<body>
  <h1>Countdown Clock</h1>
  <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>
</body>

</html>

这里有一个关于HTML，CSS和Java脚本入门的小教程。希望对您有帮助

How TO - Build a Website

答案 1 :(得分：0)

您正在尝试在尚未加载元素时调用函数initializeClock。这意味着div（id clockdiv）尚不存在，因此查询选择器找不到它并返回null。

将脚本移到正文的末尾应该可以解决它（延迟修复）。

答案 2 :(得分：0)

这有效。

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <title>Test</title>
    <style type="text/css">
        body {
            text-align: center;
            background: #00ECB9;
            font-family: sans-serif;
            font-weight: 100;
        }

        h1 {
            color: #396;
            font-weight: 100;
            font-size: 40px;
            margin: 40px 0px 20px;
        }

        #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;
        }
    </style>
    <!-- TODO: Missing CoffeeScript 2 -->
    <script type="text/javascript">
        window.onload = function () {

            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);

        }
    </script>
</head>
<body>
<h1>Countdown Clock</h1>
<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>
</body>
</html>

答案 3 :(得分：0)

您的head中的javascript不在执行中，因为它不在body内或未附加到任何事件中。您可以在页面加载window.onload = function(){}时运行它，也可以将其放在body的末尾。

您可以复制以下任何片段。

函数在窗口加载时运行： 

<html>
<head>
<script>
window.onload = function(){
initializeClock('clockdiv', deadline);
}
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);

</script>
<style>
body{
	text-align: center;
	background: #00ECB9;
  font-family: sans-serif;
  font-weight: 100;
}

h1{
  color: #396;
  font-weight: 100;
  font-size: 40px;
  margin: 40px 0px 20px;
}

#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;
}
</style>
</head>
<body>
<h1>Countdown Clock</h1>
<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>
</body>
</html>

body末尾的脚本：

<html>
<head>
<style>
body{
	text-align: center;
	background: #00ECB9;
  font-family: sans-serif;
  font-weight: 100;
}

h1{
  color: #396;
  font-weight: 100;
  font-size: 40px;
  margin: 40px 0px 20px;
}

#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;
}
</style>
</head>
<body>
<h1>Countdown Clock</h1>
<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>
<script>
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);
</script>
</body>
</html>

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