CSS3 探索发现系列：一组梦幻般的 CSS3 动画按钮效果

　　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。

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　　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：

    <section>
        <div class="particle"></div>
        <div class="cells"></div>
        <div class="jelly"></div>
        <div class="blobbs"></div>
        <div class="chase"></div>
    </section>

　　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：

section > 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);
}

section > 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：

section > 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); 
}
 
section > 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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本文链接：【CSS3 探索发现】CSS3 实现梦幻般的动画按钮

编译来源：梦想天空 ◆ 关注前端开发技术 ◆ 分享网页设计资源

posted @ 2012-12-20 15:47 梦想天空（山边小溪）阅读(12226) 评论(14) 收藏举报

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