纯javascript CSS3制作精美时钟

CSS教程3分步详解：transform属性
近来，hTML5和CSS教程3的发展速度还是很可观的，国内外不乏一些大站，酷站都在使用最新的技术。面对新的技术，我们该如何正确的把握和使用到今后的项目实战中呢？针对这一问题，浩子决定剖析CSS教程3，一一像各位同学解答CSS教程3到底是个神马东西。就已transform开始吧，写的不好的话，请严重拍砖！！

此篇文章具体介绍如下

纯javascript CSS教程3制作精美时钟。该实例主要应用了CSS教程3中transform属性（translate、rotate）、border-radius属性。

CSS教程样式：

.fill {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
}

a {
display: block;
position: fixed;
top: 0px; left: 0px;
color: #fcc;
text-decoration: none;
padding: 4px;
background: rgba(52,52,52,0.5);
font: 12px Verdana, sans-serif;
z-index: 1;
}

.clock {
position: absolute;
opacity: 1;
}

.fill .clock {
left: 50%;
top: 50%;
}

.centre {
position: absolute;
top: 50%;
left: 50%;
width: 0;
height: 0;
}

.expand {
position: absolute;
top: 0;
left: 0;
transform: translate(-50%, -50%);
}

.anchor {
position: absolute;
top: 0;
left: 0;
width: 0;
height: 0;
}

.element {
position: absolute;
top: 0;
left: 0;
}

.round {
border-radius: 296px;
}

.circle-1 {
background: white;
width: 12px;
height: 12px;
}

.circle-2 {
background: #FA9F22;
width: 8px;
height: 8px;
}

.circle-3 {
background: black;
width: 4px;
height: 4px;
}

.second {
transform: rotate(180deg);
}

.minute {
transform: rotate(54deg);
}

.second-hand {
width: 2px;
height: 164px;
background: #FA9F22;
transform: translate(-50%,-100%) translateY(24px);
}

.hour {
transform: rotate(304.5deg);
}

.thin-hand {
width: 4px;
height: 50px;
background: white;
transform: translate(-50%,-100%);
}

.fat-hand {
width: 10px;
height: 57px;
border-radius: 10px;
background: white;
transform: translate(-50%,-100%) translateY(-18px);
}

.minute-hand {
height: 112px;
}

.hour-text {
position: absolute;
font: 40px hei, helvetica, Arial, sans-serif;
color: white;
transform: translate(-50%,-50%);
}

.hour-10 {
padding-left: 0.4ex;
}
.hour-11 {
padding-left: 0.25ex;
}

.minute-text {
position: absolute;
font: 12px Avenir Next, helvetica, Arial, sans-serif;
color: white;
transform: translate(-50%,-50%);
}

.minute-line {
background: white;
width: 1px;
height: 9px;
transform: translate(-50%,-100%) translateY(-131px);
opacity: 0.34;
}
</style>

hTML代码：

<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
</head>
<body>
<div class="fill">
<div class="reference"></div>
<div class="clock" id="utility-clock">
<div class="centre">
<div class="dynamic"></div>
<div class="expand round circle-1"></div>
<div class="anchor hour">
<div class="element thin-hand"></div>
<div class="element fat-hand"></div>
</div>
<div class="anchor minute">
<div class="element thin-hand"></div>
<div class="element fat-hand minute-hand"></div>
</div>
<div class="anchor second">
<div class="element second-hand"></div>
</div>
<div class="expand round circle-2"></div>
<div class="expand round circle-3"></div>
</div>
</div>
</div>
</body>
</html>

JS代码：

autoResize(clock, 295 32)

function autoResize(element, nativeSize) {
var update = function() {
var parent = element.offsetParent
var scale = Math.min(parent.offsetWidth, parent.offsetheight) / nativeSize
element.style.transform = element.style.webkitTransform = 'scale(' scale.toFixed(3) ')'
}
update()
window.addEventListener('resize', update)
}

</script>