CSS 实现加载动画之四-圆点旋转

圆点旋转也是加载动画中经常用到的。其实现方式和菊花旋转一样，只不过一个是线条形式，一个是圆点形式。圆点按照固定的旋转角度排列，加上延时的改变透明度的动画就可以实现。这个实现也比较简单。

1. 动画截图

2. 案例源代码

 <!DOCTYPE html>
 <html>
 <head>
 <meta http-equiv="Content-Type" Content="text/html; charset=utf-8;">
 <title>CSS3实现加载的动画效果4</title>
 <meta name="author" content="rainna" />
 <meta name="keywords" content="rainna's css lib" />
 <meta name="description" content="CSS3" />
 <style>
 *{margin:0;padding:0;}

 .m-load,.m-load2{width:100px;height:100px;margin:100px auto 0;background:url('load.png') top center no-repeat;}
 .m-load2{background:green;}

 /** 加载动画的静态样式 **/
 .m-load2{position:relative;}
 .m-load2 .item{position:absolute;left:50%;top:0;width:14px;height:100%;margin-left:-7px;}
 .m-load2 .item:before,.m-load2 .item:after{content:'';display:block;width:14px;height:14px;border-radius:14px;background:#fff;}
 .m-load2 .item:after{position:absolute;bottom:0;}
 .m-load2 .item:nth-child(2){-webkit-transform:rotate(45deg);}
 .m-load2 .item:nth-child(3){-webkit-transform:rotate(90deg);}
 .m-load2 .item:nth-child(4){-webkit-transform:rotate(135deg);}

 /** 加载动画 **/
 @-webkit-keyframes load{
     0%{opacity:0;}
     100%{opacity:1;}
 }
 .m-load2 .item:nth-child(1):before{-webkit-animation:load 0.8s linear 0.7s infinite;}
 .m-load2 .item:nth-child(2):before{-webkit-animation:load 0.8s linear 0.6s infinite;}
 .m-load2 .item:nth-child(3):before{-webkit-animation:load 0.8s linear 0.5s infinite;}
 .m-load2 .item:nth-child(4):before{-webkit-animation:load 0.8s linear 0.4s infinite;}
 .m-load2 .item:nth-child(1):after{-webkit-animation:load 0.8s linear 0.3s infinite;}
 .m-load2 .item:nth-child(2):after{-webkit-animation:load 0.8s linear 0.2s infinite;}
 .m-load2 .item:nth-child(3):after{-webkit-animation:load 0.8s linear 0.1s infinite;}
 .m-load2 .item:nth-child(4):after{-webkit-animation:load 0.8s linear 0s infinite;}
 </style>
 </head>

 <body>
 <div class="m-load"></div>

 <div class="m-load2">
     <div class="item"></div>
     <div class="item"></div>
     <div class="item"></div>
     <div class="item"></div>
 </div>
 </body>
 </html>