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实例讲解JS+CSS实现滚动数字时钟效果

小云云原创: 2017-12-25 15:00:582315浏览

本文我们主要用js配合css样式表来实现一个滚动时钟的动画效果，这个效果一般都是用在网页开场动画以及区域的时间显示中，非常好看，动画效果也很个性，我们先来看下运行后的效果：

下面就是这个滚动时钟动画的全部代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>CSS3+JS滚动数字时钟代码-脚本之家</title>
<style>
body{text-align: center;background-color: #0e141b;color: rgba(224, 230, 235, 0.89);font-family: &#39;Roboto Condensed&#39;, sans-serif;font-weight: 300;overflow: hidden;}
.column,.colon{display: inline-block;vertical-align: top;font-size: 86px;line-height: 86px;}
.column{-webkit-transition: -webkit-transform 300ms;transition: -webkit-transform 300ms;transition: transform 300ms;transition: transform 300ms, -webkit-transform 300ms;}
.colon{-webkit-transition: -webkit-transform 300ms;transition: -webkit-transform 300ms;transition: transform 300ms;transition: transform 300ms, -webkit-transform 300ms;-webkit-transform: translateY(calc(50vh - 43px));transform: translateY(calc(50vh - 43px));}
.colon:after{content: &#39;:&#39;;}
.num{-webkit-transition: opacity 500ms, text-shadow 100ms;transition: opacity 500ms, text-shadow 100ms;opacity: 0.025;}
.num.visible{opacity: 1.0;text-shadow: 1px 1px 0px #336699;}
.num.close{opacity: 0.35;}
.num.far{opacity: 0.15;}
.num.distant{opacity: 0.1;}
</style>
</head>
<body>
<p class="column">
 <p class="num">0</p>
 <p class="num">1</p>
 <p class="num">2</p>
</p>
<p class="column">
 <p class="num">0</p>
 <p class="num">1</p>
 <p class="num">2</p>
 <p class="num">3</p>
 <p class="num">4</p>
 <p class="num">5</p>
 <p class="num">6</p>
 <p class="num">7</p>
 <p class="num">8</p>
 <p class="num">9</p>
</p>
<p class="colon"></p>
<p class="column">
 <p class="num">0</p>
 <p class="num">1</p>
 <p class="num">2</p>
 <p class="num">3</p>
 <p class="num">4</p>
 <p class="num">5</p>
</p>
<p class="column">
 <p class="num">0</p>
 <p class="num">1</p>
 <p class="num">2</p>
 <p class="num">3</p>
 <p class="num">4</p>
 <p class="num">5</p>
 <p class="num">6</p>
 <p class="num">7</p>
 <p class="num">8</p>
 <p class="num">9</p>
</p>
<p class="colon"></p>
<p class="column">
 <p class="num">0</p>
 <p class="num">1</p>
 <p class="num">2</p>
 <p class="num">3</p>
 <p class="num">4</p>
 <p class="num">5</p>
</p>
<p class="column">
 <p class="num">0</p>
 <p class="num">1</p>
 <p class="num">2</p>
 <p class="num">3</p>
 <p class="num">4</p>
 <p class="num">5</p>
 <p class="num">6</p>
 <p class="num">7</p>
 <p class="num">8</p>
 <p class="num">9</p>
</p>
<script>
&#39;use strict&#39;;
var size = 86;
var columns = Array.from(document.getElementsByClassName(&#39;column&#39;));
var d = undefined,
 c = undefined;
var classList = [&#39;visible&#39;, &#39;close&#39;, &#39;far&#39;, &#39;far&#39;, &#39;distant&#39;, &#39;distant&#39;];
var use24HourClock = true;
function padClock(p, n) {
	return p + (&#39;0&#39; + n).slice(-2);
}
function getClock() {
	d = new Date();
	return [use24HourClock ? d.getHours() : d.getHours() % 12 || 12, d.getMinutes(), d.getSeconds()].reduce(padClock, &#39;&#39;);
}
function getClass(n, i2) {
	return classList.find(function (class_, classIndex) {
		return i2 - classIndex === n || i2 + classIndex === n;
	}) || &#39;&#39;;
}

var loop = setInterval(function () {
	c = getClock();

	columns.forEach(function (ele, i) {
		var n = +c[i];
		var offset = -n * size;
		ele.style.transform = &#39;translateY(calc(50vh + &#39; + offset + &#39;px - &#39; + size / 2 + &#39;px))&#39;;
		Array.from(ele.children).forEach(function (ele2, i2) {
			ele2.className = &#39;num &#39; + getClass(n, i2);
		});
	});
}, 200 + Math.E * 10);
</script>
</body>
</html>

注意：其中最上面的是CSS样式内容，大家可以在其中进行调整颜色字体等

<style>
body{text-align: center;background-color: #0e141b;color: rgba(224, 230, 235, 0.89);font-family: &#39;Roboto Condensed&#39;, sans-serif;font-weight: 300;overflow: hidden;}
.column,.colon{display: inline-block;vertical-align: top;font-size: 86px;line-height: 86px;}
.column{-webkit-transition: -webkit-transform 300ms;transition: -webkit-transform 300ms;transition: transform 300ms;transition: transform 300ms, -webkit-transform 300ms;}
.colon{-webkit-transition: -webkit-transform 300ms;transition: -webkit-transform 300ms;transition: transform 300ms;transition: transform 300ms, -webkit-transform 300ms;-webkit-transform: translateY(calc(50vh - 43px));transform: translateY(calc(50vh - 43px));}
.colon:after{content: &#39;:&#39;;}
.num{-webkit-transition: opacity 500ms, text-shadow 100ms;transition: opacity 500ms, text-shadow 100ms;opacity: 0.025;}
.num.visible{opacity: 1.0;text-shadow: 1px 1px 0px #336699;}
.num.close{opacity: 0.35;}
.num.far{opacity: 0.15;}
.num.distant{opacity: 0.1;}
</style>

JS代码主要就是控制动画的滚动效果，CSS用来控制数字的大小等内容。

实例讲解JS+CSS实现滚动数字时钟效果

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