纯CSS3时钟

一、效果欣赏

纯css3打造精美时钟效果，效果如下图所示，也可看看----demo-----

二、难点解析

单独位数数字动画

动画状态的控制

三、实现步骤

1.html架构

<div class="container">
	<!-- time to add the controls -->
	<input id="start" name="controls" type="radio" />
	<input id="stop" name="controls" type="radio" />
	<input id="reset" name="controls" type="radio" />
	
	<div class="timer">
		<div class="cell">
			<div class="numbers tenhour moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
		<div class="cell">
			<div class="numbers hour moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
		<div class="cell divider"><div class="numbers">:</div></div>
		<div class="cell">
			<div class="numbers tenminute movesix">0 1 2 3 4 5 6</div>
		</div>
		<div class="cell">
			<div class="numbers minute moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
		<div class="cell divider"><div class="numbers">:</div></div>
		<div class="cell">
			<div class="numbers tensecond movesix">0 1 2 3 4 5 6</div>
		</div>
		<div class="cell">
			<div class="numbers second moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
		<div class="cell divider"><div class="numbers">:</div></div>
		<div class="cell">
			<div class="numbers milisecond moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
		<div class="cell">
			<div class="numbers tenmilisecond moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
		<div class="cell">
			<div class="numbers hundredmilisecond moveten">0 1 2 3 4 5 6 7 8 9</div>
		</div>
	</div>
	<!-- Lables for the controls -->
	<div id="timer_controls">
		<label for="start">Start</label>
		<label for="stop">Stop</label>
		<label for="reset">Reset</label>
	</div>
</div>

div#timer_controls和input[name=controls]用来实现动画的控制，需要用:checked伪类实现。

div.timer是时钟的容器，div.cell用来做数字的容器。

2. 钟表及数字样式

* {margin: 0; padding: 0;}

body{
	background-color: #084D08;
	background-size: 60px 60px;
	background-image: linear-gradient(135deg, rgba(255, 255, 255, .1) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.1) 50%, rgba(255,255,255,.1) 75%, transparent 75%, transparent);
}
h1,h2{
	color: #fff;
	text-align: center;
	margin:50px auto;
}
.container {
	padding: 10px;
	text-align: center;
}

.timer {
	padding: 10px;
	background: transparent;
	background: linear-gradient(top, #222, #444);
	overflow: hidden;
	display: inline-block;
	border: 7px solid #efefef;
	border-radius: 5px;
	position: relative;
	
	box-shadow: 
		inset 0 -2px 10px 1px rgba(0, 0, 0, 0.75), 
		0 5px 20px -10px rgba(0, 0, 0, 1);
}

.cell {
	width: 0.60em;
	height: 40px;
	font-size: 50px;
	overflow: hidden;
	position: relative;
	float: left;
}

.numbers {
	width: 0.6em;
	line-height: 40px;
	font-family: digital, arial, verdana;
	text-align: center;
	color: #fff;
	
	position: absolute;
	top: 0;
	left: 0;
	
	/*Glow to the text*/
	text-shadow: 0 0 5px rgba(255, 255, 255, 1);
}

网页背景用linear-gradient实现斜纹效果，div.timer需要实现渐变和阴影效果，div.cell和div.number实现数字竖排，只显示一个数字，为回头做数字动画做准备。

3.控制按钮样式

/*Styles for the controls*/
#timer_controls {
	margin-top: -2px;
}
#timer_controls label {
	cursor: pointer;
	padding: 5px 10px;
	background: #efefef;
	font-family: arial, verdana, tahoma;
	font-size: 11px;
	border-radius: 0 0 3px 3px;
}
input[name="controls"] {display: none;}

4.控制动画

/*Control code*/
#stop:checked~.timer .numbers {animation-play-state: paused;}
#start:checked~.timer .numbers {animation-play-state: running;}
#reset:checked~.timer .numbers {animation: none;}

.moveten {
	animation: moveten 1s steps(10, end) infinite;
	animation-play-state: paused;
}
.movesix {
	animation: movesix 1s steps(6, end) infinite;
	animation-play-state: paused;
}

.second {animation-duration: 10s;}
.tensecond {animation-duration: 60s;} /*60 times .second*/

.milisecond {animation-duration: 1s;} /*1/10th of .second*/
.tenmilisecond {animation-duration: 0.1s;}
.hundredmilisecond {animation-duration: 0.01s;}

.minute {animation-duration: 600s;} /*60 times .second*/
.tenminute {animation-duration: 3600s;} /*60 times .minute*/

.hour {animation-duration: 36000s;} /*60 times .minute*/
.tenhour {animation-duration: 360000s;} /*10 times .hour*/

@keyframes moveten {
	0% {top: 0;}
	100% {top: -400px;} 
	/*height = 40. digits = 10. hence -400 to move it completely to the top*/
}

@keyframes movesix {
	0% {top: 0;}
	100% {top: -240px;} 
	/*height = 40. digits = 6. hence -240 to move it completely to the top*/
}

@font-face {
	font-family: 'digital';
	src: url('DS-DIGI.TTF');
}

完工! 感谢carbon的Make a stopwatch using CSS3 without images or javascript。