CSS3 探索发现系列:一组梦幻般的 CSS3 动画按钮效果

  前端里博客即日起推出《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

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