<div class="foo">
<span class="letter" data-letter="A">A</span>
<span class="letter" data-letter="B">B</span>
<span class="letter" data-letter="C">C</span>
<span class="letter" data-letter="D">D</span>
<span class="letter" data-letter="E">E</span>
<span class="letter" data-letter="F">F</span>
<span class="letter" data-letter="G">G</span>
<span class="letter" data-letter="H">H</span>
<span class="letter" data-letter="I">I</span>
<span class="letter" data-letter="L">L</span>
<span class="letter" data-letter="M">M</span>
<span class="letter" data-letter="N">N</span>
<span class="letter" data-letter="O">O</span>
<span class="letter" data-letter="P">P</span>
<span class="letter" data-letter="Q">Q</span>
<span class="letter" data-letter="R">R</span>
<span class="letter" data-letter="S">S</span>
<span class="letter" data-letter="T">T</span>
<span class="letter" data-letter="U">U</span>
<span class="letter" data-letter="V">V</span>
<span class="letter" data-letter="Z">Z</span>
</div> CSS3
.letter{
display: inline-block
font-weight: 900
font-size: 8em
margin: 0.2em
position: relative
color: #00B4F1
transform-style: preserve-3d
perspective: 400
z-index: 1
} 这样我们就让这些字母安安静静的排列起来，并有了自己的背景颜色，等待强大的CSS3来渲染。
接下来我们要让文字在鼠标滑过的时候产生翻转倾斜的动画。
.letter:before, .letter:after{
position:absolute
content: attr(data-letter)
transform-origin: top left
top:0
left:0
}
.letter, .letter:before, .letter:after{
transition: all 0.3s ease-in-out
}
.letter:before{
color: #fff
text-shadow:
-1px 0px 1px rgba(255,255,255,.8),
1px 0px 1px rgba(0,0,0,.8)
z-index: 3
transform:
rotateX(0deg)
rotateY(-15deg)
rotateZ(0deg)
}
.letter:after{
color: rgba(0,0,0,.11)
z-index:2
transform:
scale(1.08,1)
rotateX(0deg)
rotateY(0deg)
rotateZ(0deg)
skew(0deg,1deg)
}
.letter:hover:before{
color: #fafafa
transform:
rotateX(0deg)
rotateY(-40deg)
rotateZ(0deg)
}
.letter:hover:after{
transform:
scale(1.08,1)
rotateX(0deg)
rotateY(40deg)
rotateZ(0deg)
skew(0deg,22deg)
}
主要思想：
首先要准备一张有连续帧的图片，然后利用HTML5 Canvas的draw方法在不同的时间间隔绘制不同的帧，这样看起来就像动画在播放。
关键技术点：
JavaScript 函数setTimeout()有两个参数，第一个是参数可以传递一个JavaScript方法，
另外一个参数代表间隔时间，单位为毫秒数。代码示例：
setTimeout( update, 1000/30)
Canvas的API-drawImage()方法，需要指定全部9个参数：
ctx.drawImage(myImage, offw, offh, width,height, x2, y2, width, height)
其中offw, offh是指源图像的起始坐标点，width, height表示源图像的宽与高，x2,y2表
示源图像在目标Canvas上的起始坐标点。
<!DOCTYPE html><html>
<head>
<meta http-equiv="X-UA-Compatible" content="chrome=IE8">
<meta http-equiv="Content-type" content="text/htmlcharset=UTF-8">
<title>Canvas Mouse Event Demo</title>
<link href="default.css" rel="stylesheet" />
<script>
var ctx = null // global variable 2d context
var started = false
var mText_canvas = null
var x = 0, y =0
var frame = 0 // 22 5*5 + 2
var imageReady = false
var myImage = null
var px = 300
var py = 300
var x2 = 300
var y2 = 0
window.onload = function() {
var canvas = document.getElementById("animation_canvas")
console.log(canvas.parentNode.clientWidth)
canvas.width = canvas.parentNode.clientWidth
canvas.height = canvas.parentNode.clientHeight
if (!canvas.getContext) {
console.log("Canvas not supported. Please install a HTML5 compatible browser.")
return
}
// get 2D context of canvas and draw rectangel
ctx = canvas.getContext("2d")
ctx.fillStyle="black"
ctx.fillRect(0, 0, canvas.width, canvas.height)
myImage = document.createElement('img')
myImage.src = "../robin.png"
myImage.onload = loaded()
}
function loaded() {
imageReady = true
setTimeout( update, 1000/30)
}
function redraw() {
ctx.clearRect(0, 0, 460, 460)
ctx.fillStyle="black"
ctx.fillRect(0, 0, 460, 460)
// find the index of frames in image
var height = myImage.naturalHeight/5
var width = myImage.naturalWidth/5
var row = Math.floor(frame / 5)
var col = frame - row * 5
var offw = col * width
var offh = row * height
// first robin
px = px - 5
py = py - 5
if(px < -50) {
px = 300
}
if(py < -50) {
py = 300
}
//var rate = (frame+1) /22
//var rw = Math.floor(rate * width)
//var rh = Math.floor(rate * height)
ctx.drawImage(myImage, offw, offh, width, height, px, py, width, height)
// second robin
x2 = x2 - 5
y2 = y2 + 5
if(x2 < -50) {
x2 = 300
y2 = 0
}
ctx.drawImage(myImage, offw, offh, width, height, x2, y2, width, height)
}
function update() {
redraw()
frame++
if (frame >= 22) frame = 0
setTimeout( update, 1000/30)
}
</script>
</head>
<body>
<h1>HTML Canvas Animations Demo - By Gloomy Fish</h1>
<pre>Play Animations</pre>
<div id="my_painter">
<canvas id="animation_canvas"></canvas>
</div>
</body>
</html>
方法/步骤HTML结构
该鼠标点击按钮特效中每一个可点击的元素都是一个<button>按钮
CSS样式
以下是该css3点击按钮特效的通用CSS样式：
插件中通过在点击按钮时使用javascript来为它添加相应的动画CLASS来执行动画效果：
上面的CSS代码可以生成如下图的动画效果：
在“Stana”效果中，使用了html5 SVG clipPath，在它上面添加了一个transition。这个效果只能在Chrome浏览器中才能看到效果。
在“Stoja”效果中使用了CSS clip-path属性，这个效果也需要浏览器的支持才能看得到的。
