原文:http://margox.me/css3clock.html
第一次发文章,比较激动。
本码农长期浸淫于Dribbble等设计师网站,看到那些好看的设计作品就非常激动,但是无奈PS不精通,AI也早忘光了,只不过对前端略有研究,偶然间看到几个设计清爽的时钟,觉得用CSS实现起来应该也没什么难度,于是花了个把钟头琢磨了一个出来。
效果图
技术点
- box-shadow 表盘的质感什么的全靠它了
- nth-child(x) 用于表盘刻度的定位什么的
- transform-origin 这个用来定位三个表针旋转的中心点
- keyframes 表针动画效果
流程
先设计好DOM结构,代码如下:
<div class="clock-wrapper"> <div class="clock-base"> <div class="click-indicator"> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> </div> <div class="clock-hour"></div> <div class="clock-minute"></div> <div class="clock-second"></div> <div class="clock-center"></div> </div></div>
结构很简单,从样式名可以看出来每个元素的用处,中间那段空div自然就是表盘刻度了。
接下来是CSS代码
html,body{ height: 100%; margin: 0; padding: 0; background-image: linear-gradient(#e7e7e7,#d7d7d7);}/*时钟容器*/.clock-wrapper{ position: absolute; top: 0; right: 0; bottom: 100px; left: 0; width: 250px; height: 250px; margin: auto; padding: 5px; background-image: linear-gradient(#f7f7f7,#e0e0e0); border-radius: 50%; box-shadow: 0 10px 15px rgba(0,0,0,.15),0 2px 2px rgba(0,0,0,.2);}/*表盘*/.clock-base{ width: 250px; height: 250px; background-color: #eee; border-radius: 50%; box-shadow: 0 0 5px #eee;}/*表盘刻度容器*/.click-indicator{ position: absolute; z-index: 1; top: 15px; left: 15px; width: 230px; height: 230px;}/*表盘刻度*/.click-indicator div{ position: absolute; width: 2px; height: 4px; margin: 113px 114px; background-color: #ddd;}/*分别设置各个刻度的位置和角度*/.click-indicator div:nth-child(1) { transform: rotate(30deg) translateY(-113px);}.click-indicator div:nth-child(2) { transform: rotate(60deg) translateY(-113px);}.click-indicator div:nth-child(3) { transform: rotate(90deg) translateY(-113px); background-color: #aaa;}.click-indicator div:nth-child(4) { transform: rotate(120deg) translateY(-113px);}.click-indicator div:nth-child(5) { transform: rotate(150deg) translateY(-113px);}.click-indicator div:nth-child(6) { transform: rotate(180deg) translateY(-113px); background-color: #aaa;}.click-indicator div:nth-child(7) { transform: rotate(210deg) translateY(-113px);}.click-indicator div:nth-child(8) { transform: rotate(240deg) translateY(-113px);}.click-indicator div:nth-child(9) { transform: rotate(270deg) translateY(-113px); background-color: #aaa;}.click-indicator div:nth-child(10) { transform: rotate(300deg) translateY(-113px);}.click-indicator div:nth-child(11) { transform: rotate(330deg) translateY(-113px);}.click-indicator div:nth-child(12) { transform: rotate(360deg) translateY(-113px); background-color: #c00;}/*时针*/.clock-hour{ position: absolute; z-index: 2; top: 80px; left: 128px; width: 4px; height: 65px; background-color: #555; border-radius: 2px; box-shadow: 0 0 2px rgba(0,0,0,.2); transform-origin: 2px 50px; transition: .5s; -webkit-animation: rotate-hour 43200s linear infinite;}/*分针*/.clock-minute{ position: absolute; z-index: 3; top: 60px; left: 128px; width: 4px; height: 85px; background-color: #555; border-radius: 2px; box-shadow: 0 0 2px rgba(0,0,0,.2); transform-origin: 2px 70px; transition: .5s; -webkit-animation: rotate-minute 3600s linear infinite;}/*秒针*/.clock-second{ position: absolute; z-index: 4; top: 20px; left: 129px; width: 2px; height: 130px; background-color: #a00; box-shadow: 0 0 2px rgba(0,0,0,.2); transform-origin: 1px 110px; transition: .5s; -webkit-animation: rotate-second 60s linear infinite;}.clock-second:after{ content: ""; display: block; position: absolute; left: -5px; bottom: 14px; width: 8px; height: 8px; background-color: #a00; border: solid 2px #a00; border-radius: 50%; box-shadow: 0 0 3px rgba(0,0,0,.2);}/*表盘中央的原型区域*/.clock-center{ position: absolute; z-index: 1; width: 150px; height: 150px; top: 55px; left: 55px; background-image: linear-gradient(#e3e3e3,#f7f7f7); border-radius: 50%; box-shadow: inset 0 -1px 0 #fafafa, inset 0 1px 0 #e3e3e3;}.clock-center:after{ content: ""; display: block; width: 20px; height: 20px; margin: 65px; background-color: #ddd; border-radius: 50%;}
样式文件就这些,不过这样的话三个指针都是在12点的,接下来需要让指针动起来。
其实简单点的话直接在css里面定好动画规则就行了:时针3600秒旋转360度,分针秒针以此类推。
但是强迫症表示这样坚决不行,连正确的时间都不能指示的时钟肯定是山寨品,所以这里需要找CSS的好兄弟JavaScript借下力了:
(function(){ //generate clock animations var now = new Date(), hourDeg = now.getHours() / 12 * 360 + now.getMinutes() / 60 * 30, minuteDeg = now.getMinutes() / 60 * 360 + now.getSeconds() / 60 * 6, secondDeg = now.getSeconds() / 60 * 360, stylesDeg = [ "@-webkit-keyframes rotate-hour{from{transform:rotate(" + hourDeg + "deg);}to{transform:rotate(" + (hourDeg + 360) + "deg);}}", "@-webkit-keyframes rotate-minute{from{transform:rotate(" + minuteDeg + "deg);}to{transform:rotate(" + (minuteDeg + 360) + "deg);}}", "@-webkit-keyframes rotate-second{from{transform:rotate(" + secondDeg + "deg);}to{transform:rotate(" + (secondDeg + 360) + "deg);}}" ].join(""); document.getElementById("clock-animations").innerHTML = stylesDeg;})();
哦,千万别忘了在head标签里面放点东西:
<style id="clock-animations"></style>
不然JS生成的样式代码没地方安身啊。
好了,以上代码我已经放在了jsbin上:
http://output.jsbin.com/xeraxe
--
就这些了,献个丑,各位轻拍~ :)

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