梦想天空博客即日起推出《CSS3 探索发现》系列文章，分享和展示各种让人惊奇的 CSS3 示例。梦天空博客关注 前端开发 技术，分享各种增强网站用户体验的 jQuery 插件，展示前沿的 HTML5 和 CSS3 技术应用，推荐优秀的 网页设计 案例，共享精美的设计素材和优秀的 Web 开发工具。
- Web 开发人员和设计师必读文章推荐
- 20个非常绚丽的 CSS3 特性应用演示
- 35个让人惊讶的 CSS3 动画效果演示
- 推荐12个漂亮的 CSS3 按钮实现方案
- 24款非常实用的 CSS3 工具终极收藏
今天是这个系列的第一篇，给大家带来的是五款梦幻般的动画按钮效果。下面是在线演示，把鼠标放在按钮上试试，有惊喜哦！（温馨提示：如果不显示请刷新页面，在 Chrome，Firefox 和 Safari 浏览器中效果最佳。）
如果上面的在线演示不能显示请刷新页面或者访问链接：http://jsfiddle.net/lhb25/9EcuV/8/embedded/result/。
HTML 部分非常简单，五种效果对应的class为：praticle、cells、jelly、blobbs、chase，代码如下：
<div>
<div class="particle"></div>
<div class="cells"></div>
<div class="jelly"></div>
<div class="blobbs"></div>
<div class="chase"></div>
</div>
这些精美的效果用到了 CSS3 border-radius（圆角）、box-shadow（阴影）、transition（变形）、transform（转换）和 animation（动画）等特性，公共部分的完整代码如下：
div > div {
display: inline-block;
position: relative;
width: 200px;
height: 200px;
margin: 0px auto;
border-radius: 50%;
border: 10px solid hsla(0,0%,0%,.7);
box-shadow: inset 0 15px 15px -5px hsla(0,0%,100%,.7),
inset 0 -5px 10px 3px hsla(0,0%,0%,.6),
0 8px 10px 2px hsla(0,0%,0%,.3);
background-position: center;
-webkit-transform: scale3d(.66,.66,1);
-moz-transform: scale(.66);
-ms-transform: scale(.66);
-o-transform: scale(.66);
transform: scale(.66);
-webkit-transition: -webkit-transform .5s cubic-bezier(.32,0,.15,1);
-moz-transition: -moz-transform .5s cubic-bezier(.32,0,.15,1);
-ms-transition: -ms-transform .5s cubic-bezier(.32,0,.15,1);
-o-transition: -o-transform .5s cubic-bezier(.32,0,.15,1);
transition: transform .5s cubic-bezier(.32,0,.15,1);
}
div > div:hover {
cursor: none;
-webkit-transform: scale3d(1,1,1);
-moz-transform: scale(1);
-ms-transform: scale(1);
-o-transform: scale(1);
transform: scale(1);
-webkit-transition: -webkit-transform .2s cubic-bezier(.32,0,.15,1);
-moz-transition: -moz-transform .2s cubic-bezier(.32,0,.15,1);
-ms-transition: -ms-transform .2s cubic-bezier(.32,0,.15,1);
-o-transition: -o-transform .2s cubic-bezier(.32,0,.15,1);
transition: transform .2s cubic-bezier(.32,0,.15,1);
}
这段代码看起来很长很复杂，其实大部分是兼容性代码，精简以后的代码如下：
div > div {
display: inline-block;
position: relative;
width: 200px;
height: 200px;
margin: 0px auto;
/*对于正方形元素border-radius设置为50%刚好变成圆形*/
border-radius: 50%;
/*宽度为10px的、不透明度为0.7的黑色边框效果*/
border: 10px solid hsla(0,0%,0%,.7);
/*通过边框阴影实现立体按钮效果，inset是内阴影效果*/
box-shadow: inset 0 15px 15px -5px hsla(0,0%,100%,.7),
inset 0 -5px 10px 3px hsla(0,0%,0%,.6),
0 8px 10px 2px hsla(0,0%,0%,.3);
background-position: center;
/*初始缩放0.66倍*/
transform: scale(.66);
/*在失去焦点时根据自定义的贝塞尔时间曲线做动画变换效果*/
transition: transform .5s cubic-bezier(.32,0,.15,1);
}
div > div:hover {
cursor: none;
/*悬停时恢复原始大小*/
transform: scale(1);
/*鼠标悬停时根据自定义的贝塞尔时间曲线做动画变换效果*/
transition: transform .2s cubic-bezier(.32,0,.15,1);
}
上面的代码中用到了贝塞尔曲线，在数学的数值分析领域中，贝塞尔曲线又称贝赛尔曲线（Bézier曲线）是电脑图形学中相当重要的参数曲线。更高维度的广泛化贝塞尔曲线就称作贝塞尔曲面，其中贝塞尔三角是一种特殊的实例。
贝塞尔曲线于1962年，由法国工程师皮埃尔·贝塞尔（Pierre Bézier）所广泛发表，他运用贝塞尔曲线来为汽车的主体进行设计。贝塞尔曲线最初由Paul de Casteljau于1959年运用de Casteljau算法开发，以稳定数值的方法求出贝塞尔曲线。
想更加深入的了解贝塞尔曲线可以到维基百科了解：贝塞尔曲线。下面是五种效果的完整代码：
效果一（Praticle）的完整代码：
.particle {
background-size: 12px 12px;
background-color: #000;
/* the default highlight was too strong */
box-shadow: inset 0 15px 15px -5px hsla(0,0%,100%,.25), inset 0 -5px 10px 3px hsla(0,0%,0%,.6), 0 8px 10px 2px hsla(0,0%,0%,.3);
background-image: -webkit-radial-gradient( #555 0px, hsla(0,0%,0%,0) 2px, hsla(0,0%,0%,0) 24px),
-webkit-repeating-radial-gradient( white 0px, black 2px, black 48px);
background-image: -moz-radial-gradient( #555 0px, hsla(0,0%,0%,0) 2px, hsla(0,0%,0%,0) 24px),
-moz-repeating-radial-gradient( white 0px, black 2px, black 48px);
background-image: -ms-radial-gradient( #555 0px, hsla(0,0%,0%,0) 2px, hsla(0,0%,0%,0) 24px),
-ms-repeating-radial-gradient( white 0px, black 2px, black 48px);
background-image: -o-radial-gradient( #555 0px, hsla(0,0%,0%,0) 2px, hsla(0,0%,0%,0) 24px),
-o-repeating-radial-gradient( white 0px, black 2px, black 48px);
background-image: radial-gradient( #555 0px, hsla(0,0%,0%,0) 2px, hsla(0,0%,0%,0) 24px),
repeating-radial-gradient( white 0px, black 2px, black 48px);
}
.particle:hover {
-webkit-animation: particle-size .24s linear infinite, particle-positon .48s linear infinite alternate;
-moz-animation: particle-size .24s linear infinite, particle-positon .48s linear infinite alternate;
-ms-animation: particle-size .24s linear infinite, particle-positon .48s linear infinite alternate;
-o-animation: particle-size .24s linear infinite, particle-positon .48s linear infinite alternate;
animation: particle-size .24s linear infinite, particle-positon .48s linear infinite alternate;
}
@-webkit-keyframes particle-size { from { background-size: 6px 6px, 12px 12px; } to { background-size: 12px 12px, 24px 24px; } }
@-moz-keyframes particle-size { from { background-size: 6px 6px, 12px 12px; } to { background-size: 12px 12px, 24px 24px; } }
@-ms-keyframes particle-size { from { background-size: 6px 6px, 12px 12px; } to { background-size: 12px 12px, 24px 24px; } }
@-o-keyframes particle-size { from { background-size: 6px 6px, 12px 12px; } to { background-size: 12px 12px, 24px 24px; } }
@keyframes particle-size { from { background-size: 6px 6px, 12px 12px; } to { background-size: 12px 12px, 24px 24px; } }
@-webkit-keyframes particle-positon { from { background-position: 60px, 60px; } to { background-position: 140px, 140px; } }
@-moz-keyframes particle-positon { from { background-position: 60px, 60px; } to { background-position: 140px, 140px; } }
@-ms-keyframes particle-positon { from { background-position: 60px, 60px; } to { background-position: 140px, 140px; } }
@-o-keyframes particle-positon { from { background-position: 60px, 60px; } to { background-position: 140px, 140px; } }
@keyframes particle-positon { from { background-position: 60px, 60px; } to { background-position: 140px, 140px; } }
这个效果使用了 CSS3 radial-gradient（径向渐变或者放射性渐变，另外一种是线性渐变）、repeating-radial-gradient（重复渐变）以及 CSS3 Animation（动画），关于 CSS3 渐变的详细使用方法可以参考这篇文章：CSS3 Gradient，CSS3 动画可以参考这篇文章：CSS3 Animation。
为了便于阅读和学习，效果一的代码精简后如下：
.particle {
background-size: 12px 12px;
background-color: #000;
/*前面公共样式部分box-shadow产生的高亮效果太强，这里重新配置*/
box-shadow: inset 0 15px 15px -5px hsla(0,0%,100%,.25),
inset 0 -5px 10px 3px hsla(0,0%,0%,.6),
0 8px 10px 2px hsla(0,0%,0%,.3);
/*使用径向渐变和重复渐变来实现背景图片效果*/
background-image: radial-gradient( #555 0px, hsla(0,0%,0%,0) 2px, hsla(0,0%,0%,0) 24px),
repeating-radial-gradient( white 0px, black 2px, black 48px);
}
.particle:hover {
/*鼠标悬停的时候执行particle-size和particle-positon两个动画效果*/
animation: particle-size .24s linear infinite,
particle-positon .48s linear infinite alternate;
}
@keyframes particle-size {
/*这个名为particle-size的关键帧用来产生背景尺寸变化动画效果*/
from { background-size: 6px 6px, 12px 12px; }
to { background-size: 12px 12px, 24px 24px; }
}
@keyframes particle-positon {
/*这个名为particle-positon的关键帧用来产生背景位置变化动画效果*/
from { background-position: 60px, 60px; }
to { background-position: 140px, 140px; }
}
效果二（Cells）的完整代码：
.cells {
background-size: 24px 24px;
background-color: #fff;
background-image: -webkit-repeating-radial-gradient( black 8px, white 12px);
background-image: -moz-repeating-radial-gradient( black 8px, white 12px);
background-image: -ms-repeating-radial-gradient( black 8px, white 12px);
background-image: -o-repeating-radial-gradient( black 8px, white 12px);
background-image: repeating-radial-gradient( black 8px, white 12px);
}
.cells:hover {
-webkit-animation: cells 0.4s linear infinite;
-moz-animation: cells 0.4s linear infinite;
-ms-animation: cells 0.4s linear infinite;
-o-animation: cells 0.4s linear infinite;
animation: cells 0.4s linear infinite;
}
@-webkit-keyframes cells { from { background-size: 12px 12px; } to { background-size: 24px 24px; } }
@-moz-keyframes cells { from { background-size: 12px 12px; } to { background-size: 24px 24px; } }
@-ms-keyframes cells { from { background-size: 12px 12px; } to { background-size: 24px 24px; } }
@-o-keyframes cells { from { background-size: 12px 12px; } to { background-size: 24px 24px; } }
@keyframes cells { from { background-size: 12px 12px; } to { background-size: 24px 24px; } }
效果二代码和效果一代码类似，差别是效果二的背景是只用了重复渐变（repeating-radial-gradient），动画效果只是背景尺寸（background-size）的变化，精简后的代码如下：
.cells {
background-size: 24px 24px;
background-color: #fff;
/*使用重复径向渐变特性来实现背景图片效果*/
background-image: repeating-radial-gradient( black 8px, white 12px);
}
.cells:hover {
/*鼠标悬停的时候执行cells动画效果*/
animation: cells 0.4s linear infinite;
}
@keyframes cells {
/*定义一个名为cells的关键帧用来产生背景尺寸变化动画效果*/
from { background-size: 12px 12px; }
to { background-size: 24px 24px; }
}
效果三（Jelly）的完整代码：
.jelly {
background-size: 60px 60px;
background-color: hsla(320,80%,60%,1);
background-image: -webkit-repeating-radial-gradient( hsla(320,100%,60%,.6) 0px, hsla(220,100%,60%,0) 60%),
-webkit-repeating-radial-gradient( hsla(330,100%,40%,1) 12%, hsla(320,80%,60%,1) 24px);
background-image: -moz-repeating-radial-gradient( hsla(320,100%,60%,.6) 0px, hsla(220,100%,60%,0) 60%),
-moz-repeating-radial-gradient( hsla(330,100%,40%,1) 12%, hsla(320,80%,60%,1) 24px);
background-image: -ms-repeating-radial-gradient( hsla(320,100%,60%,.6) 0px, hsla(220,100%,60%,0) 60%),
-ms-repeating-radial-gradient( hsla(330,100%,40%,1) 12%, hsla(320,80%,60%,1) 24px);
background-image: -o-repeating-radial-gradient( hsla(320,100%,60%,.6) 0px, hsla(220,100%,60%,0) 60%),
-o-repeating-radial-gradient( hsla(330,100%,40%,1) 12%, hsla(320,80%,60%,1) 24px);
background-image: repeating-radial-gradient( hsla(320,100%,60%,.6) 0px, hsla(220,100%,60%,0) 60%),
repeating-radial-gradient( hsla(330,100%,40%,1) 12%, hsla(320,80%,60%,1) 24px);
}
.jelly:hover {
-webkit-animation: jelly 1.4s cubic-bezier(.1,.4,.9,.6) infinite;
-moz-animation: jelly 1.4s cubic-bezier(.1,.4,.9,.6) infinite;
-ms-animation: jelly 1.4s cubic-bezier(.1,.4,.9,.6) infinite;
-o-animation: jelly 1.4s cubic-bezier(.1,.4,.9,.6) infinite;
animation: jelly 1.4s cubic-bezier(.1,.4,.9,.6) infinite;
}
@-webkit-keyframes jelly {
from { background-size: 60px 60px, 24px 24px; }
50% { background-size: 120px 120px, 100px 100px; }
to { background-size: 24px 24px, 140px 140px; }
}
@-moz-keyframes jelly {
from { background-size: 60px 60px, 24px 24px; }
50% { background-size: 120px 120px, 100px 100px; }
to { background-size: 24px 24px, 140px 140px; }
}
@-ms-keyframes jelly {
from { background-size: 60px 60px, 24px 24px; }
50% { background-size: 120px 120px, 100px 100px; }
to { background-size: 24px 24px, 140px 140px; }
}
@-o-keyframes jelly {
from { background-size: 60px 60px, 24px 24px; }
50% { background-size: 120px 120px, 100px 100px; }
to { background-size: 24px 24px, 140px 140px; }
}
@keyframes jelly {
from { background-size: 60px 60px, 24px 24px; }
50% { background-size: 120px 120px, 100px 100px; }
to { background-size: 24px 24px, 140px 140px; }
}
效果三和效果一的代码类似，不同的地方是动画多了个 50% 关键帧，精简后的代码如下：
.jelly {
background-size: 60px 60px;
background-color: hsla(320,80%,60%,1);
/*使用径向渐变和重复渐变来实现背景图片效果*/
background-image: repeating-radial-gradient( hsla(320,100%,60%,.6) 0px, hsla(220,100%,60%,0) 60%),
repeating-radial-gradient( hsla(330,100%,40%,1) 12%, hsla(320,80%,60%,1) 24px);
}
.jelly:hover {
/*鼠标悬停的时候执行jelly动画效果*/
animation: jelly 1.4s cubic-bezier(.1,.4,.9,.6) infinite;
}
@keyframes jelly {
/*定义一个名为jelly的关键帧用来产生背景尺寸变化动画效果*/
from { background-size: 60px 60px, 24px 24px; }
50% { background-size: 120px 120px, 100px 100px; }
to { background-size: 24px 24px, 140px 140px; }
}
效果四（Blobbs）的完整代码：
.blobbs {
background-size: 66px 66px;
background-color: hsl(200,100%,50%);
background-image: -webkit-repeating-radial-gradient( hsla(200,100%,80%,.8) 0px, hsla(200,100%,80%,.5) 4px, hsla(200,100%,80%,0) 50px),
-webkit-repeating-radial-gradient( hsla(260,100%, 0%, 0) 0px, hsla(260,100%,50%,.1) 2px, hsla(260,100%, 0%,0) 10px);
background-image: -moz-repeating-radial-gradient( hsla(200,100%,80%,.8) 0px, hsla(200,100%,80%,.5) 4px, hsla(200,100%,80%,0) 50px),
-moz-repeating-radial-gradient( hsla(260,100%, 0%, 0) 0px, hsla(260,100%,50%,.1) 2px, hsla(260,100%, 0%,0) 10px);
background-image: -ms-repeating-radial-gradient( hsla(200,100%,80%,.8) 0px, hsla(200,100%,80%,.5) 4px, hsla(200,100%,80%,0) 50px),
-ms-repeating-radial-gradient( hsla(260,100%, 0%, 0) 0px, hsla(260,100%,50%,.1) 2px, hsla(260,100%, 0%,0) 10px);
background-image: -o-repeating-radial-gradient( hsla(200,100%,80%,.8) 0px, hsla(200,100%,80%,.5) 4px, hsla(200,100%,80%,0) 50px),
-o-repeating-radial-gradient( hsla(260,100%, 0%, 0) 0px, hsla(260,100%,50%,.1) 2px, hsla(260,100%, 0%,0) 10px);
background-image: repeating-radial-gradient( hsla(200,100%,80%,.8) 0px, hsla(200,100%,80%,.5) 4px, hsla(200,100%,80%,0) 50px),
repeating-radial-gradient( hsla(260,100%, 0%, 0) 0px, hsla(260,100%,50%,.1) 2px, hsla(260,100%, 0%,0) 10px);
}
.blobbs:hover {
-webkit-animation: blobbs-position 6s cubic-bezier(.4,0,.2,1) infinite,
blobbs-size .75s cubic-bezier(.4,0,.2,1) infinite alternate;
-moz-animation: blobbs-position 6s cubic-bezier(.4,0,.2,1) infinite,
blobbs-size .75s cubic-bezier(.4,0,.2,1) infinite alternate;
-ms-animation: blobbs-position 6s cubic-bezier(.4,0,.2,1) infinite,
blobbs-size .75s cubic-bezier(.4,0,.2,1) infinite alternate;
-o-animation: blobbs-position 6s cubic-bezier(.4,0,.2,1) infinite,
blobbs-size .75s cubic-bezier(.4,0,.2,1) infinite alternate;
animation: blobbs-position 6s cubic-bezier(.4,0,.2,1) infinite,
blobbs-size .75s cubic-bezier(.4,0,.2,1) infinite alternate;
}
@-webkit-keyframes blobbs-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-moz-keyframes blobbs-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-ms-keyframes blobbs-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-o-keyframes blobbs-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@keyframes blobbs-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-webkit-keyframes blobbs-size { from { background-size: 200px 200px, 200px 200px; } to { background-size: 66px 66px, 66px 66px; } }
@-moz-keyframes blobbs-size { from { background-size: 200px 200px, 200px 200px; } to { background-size: 66px 66px, 66px 66px; } }
@-ms-keyframes blobbs-size { from { background-size: 200px 200px, 200px 200px; } to { background-size: 66px 66px, 66px 66px; } }
@-o-keyframes blobbs-size { from { background-size: 200px 200px, 200px 200px; } to { background-size: 66px 66px, 66px 66px; } }
@keyframes blobbs-size { from { background-size: 200px 200px, 200px 200px; } to { background-size: 66px 66px, 66px 66px; } }
效果四的背景位置变化动画有0%，25%，50%，75%和100%五个关键帧，动画效果更丰富，精简后的代码如下：
.blobbs {
background-size: 66px 66px;
background-color: hsl(200,100%,50%);
background-image: repeating-radial-gradient( hsla(200,100%,80%,.8) 0px, hsla(200,100%,80%,.5) 4px, hsla(200,100%,80%,0) 50px),
repeating-radial-gradient( hsla(260,100%, 0%, 0) 0px, hsla(260,100%,50%,.1) 2px, hsla(260,100%, 0%,0) 10px);
}
.blobbs:hover {
animation: blobbs-position 6s cubic-bezier(.4,0,.2,1) infinite,
blobbs-size .75s cubic-bezier(.4,0,.2,1) infinite alternate;
}
@keyframes blobbs-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@keyframes blobbs-size {
from { background-size: 200px 200px, 200px 200px; }
to { background-size: 66px 66px, 66px 66px; }
}
效果五（Chase）的完整代码：
.chase {
background-repeat: no-repeat, repeat;
background-size: 180px 180px;
background-color: hsl(50,100%,70%);
background-image: -webkit-repeating-radial-gradient( hsla(50,100%,100%,1) 0px, hsla(50,100%,90%, 1) 10px, hsla(50,100%,70%,.2) 12px, hsla(50,100%,70%,0) 130px),
-webkit-repeating-radial-gradient( hsla(20,100%, 50%,0) 20%, hsla(20,100%,50%,.4) 80%, hsla(50,100%,70%, 1) 120px);
background-image: -moz-repeating-radial-gradient( hsla(50,100%,100%,1) 0px, hsla(50,100%,90%, 1) 10px, hsla(50,100%,70%,.2) 12px, hsla(50,100%,70%,0) 130px),
-moz-repeating-radial-gradient( hsla(20,100%, 50%,0) 20%, hsla(20,100%,50%,.4) 80%, hsla(50,100%,70%, 1) 120px);
background-image: -ms-repeating-radial-gradient( hsla(50,100%,100%,1) 0px, hsla(50,100%,90%, 1) 10px, hsla(50,100%,70%,.2) 12px, hsla(50,100%,70%,0) 130px),
-ms-repeating-radial-gradient( hsla(20,100%, 50%,0) 20%, hsla(20,100%,50%,.4) 80%, hsla(50,100%,70%, 1) 120px);
background-image: -o-repeating-radial-gradient( hsla(50,100%,100%,1) 0px, hsla(50,100%,90%, 1) 10px, hsla(50,100%,70%,.2) 12px, hsla(50,100%,70%,0) 130px),
-o-repeating-radial-gradient( hsla(20,100%, 50%,0) 20%, hsla(20,100%,50%,.4) 80%, hsla(50,100%,70%, 1) 120px);
background-image: repeating-radial-gradient( hsla(50,100%,100%,1) 0px, hsla(50,100%,90%, 1) 10px, hsla(50,100%,70%,.2) 12px, hsla(50,100%,70%,0) 130px),
repeating-radial-gradient( hsla(20,100%, 50%,0) 20%, hsla(20,100%,50%,.4) 80%, hsla(50,100%,70%, 1) 120px);
}
.chase:hover {
-webkit-animation: chase-position 1.2s infinite, chase-size .4s infinite alternate;
-moz-animation: chase-position 1.2s infinite, chase-size .4s infinite alternate;
-ms-animation: chase-position 1.2s infinite, chase-size .4s infinite alternate;
-o-animation: chase-position 1.2s infinite, chase-size .4s infinite alternate;
animation: chase-position 1.2s infinite, chase-size .4s infinite alternate;
}
@-webkit-keyframes chase-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-moz-keyframes chase-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-ms-keyframes chase-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-o-keyframes chase-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@keyframes chase-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@-webkit-keyframes chase-size {
from { background-size: 120px 120px, 300px 300px; }
50% { background-size: 160px 160px, 150px 150px; }
to { background-size: 180px 180px, 100px 100px; }
}
@-moz-keyframes chase-size {
from { background-size: 120px 120px, 300px 300px; }
50% { background-size: 160px 160px, 150px 150px; }
to { background-size: 180px 180px, 100px 100px; }
}
@-ms-keyframes chase-size {
from { background-size: 120px 120px, 300px 300px; }
50% { background-size: 160px 160px, 150px 150px; }
to { background-size: 180px 180px, 100px 100px; }
}
@-o-keyframes chase-size {
from { background-size: 120px 120px, 300px 300px; }
50% { background-size: 160px 160px, 150px 150px; }
to { background-size: 180px 180px, 100px 100px; }
}
@keyframes chase-size {
from { background-size: 120px 120px, 300px 300px; }
50% { background-size: 160px 160px, 150px 150px; }
to { background-size: 180px 180px, 100px 100px; }
}?
最后这个效果比前面四个效果都更复杂，背景位置变化动画有0%，25%，50%，75%和100%五个关键帧，背景尺寸的变化动画有0%（from），50%，100%（to）三个关键帧，精简后的代码如下：
.chase {
background-repeat: no-repeat, repeat;
background-size: 180px 180px;
background-color: hsl(50,100%,70%);
background-image: repeating-radial-gradient( hsla(50,100%,100%,1) 0px, hsla(50,100%,90%, 1) 10px, hsla(50,100%,70%,.2) 12px, hsla(50,100%,70%,0) 130px),
repeating-radial-gradient( hsla(20,100%, 50%,0) 20%, hsla(20,100%,50%,.4) 80%, hsla(50,100%,70%, 1) 120px);
}
.chase:hover {
animation: chase-position 1.2s infinite, chase-size .4s infinite alternate;
}
@keyframes chase-position {
0% { background-position: left top, left top; }
25% { background-position: right top, left bottom; }
50% { background-position: right bottom, right bottom; }
75% { background-position: left bottom, right top; }
100% { background-position: left top, left top; }
}
@keyframes chase-size {
from { background-size: 120px 120px, 300px 300px; }
50% { background-size: 160px 160px, 150px 150px; }
to { background-size: 180px 180px, 100px 100px; }
}?
完整源码下载 在线效果演示
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