CSS3绘制8种超炫的加载动画

Posted 2022-12-12 火雨_Nick

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CSS3绘制8种超炫的加载动画

逛前端开发网站的时候，偶尔发现一组非常炫酷的CSS3加载动画，遂迫不及待的做个Demo保存下来。

这些加载动画用到了CSS3的旋转transform属性，颜色透明度设置和伪元素操作等CSS技术。奇妙的组合，产生了意想不到的效果。

1.上下起伏波动的加载动画：

  #loader1,
  #loader1:before,
  #loader1:after 
     background: #f2fa08;
     -webkit-animation: load1 1s infinite ease-in-out;
     animation: load1 1s infinite ease-in-out;
     width: 1em;
     height: 4em;
   
   #loader1:before,
   #loader1:after 
     position: absolute;
     top: 0;
     content: '';
   
   #loader1:before 
     left: -1.5em;
   
   #loader1 
     text-indent: -9999em;
     margin: 50px 50px;
     position: relative;
     float: left;
     font-size: 11px;
     -webkit-animation-delay: 0.16s;
     animation-delay: 0.16s;
   
   #loader1:after 
     left: 1.5em;
     -webkit-animation-delay: 0.32s;
     animation-delay: 0.32s;
   
   @-webkit-keyframes load1 
     0%,
     80%,
     100% 
       box-shadow: 0 0 #f2fa08;
       height: 4em;
     
     40% 
       box-shadow: 0 -2em #f2fa08;
       height: 5em;
     
   
   @keyframes load1 
     0%,
     80%,
     100% 
       box-shadow: 0 0 #f2ff08;
       height: 4em;
     
     40% 
       box-shadow: 0 -2em #f2ff08;
       height: 5em;

2.类似弹簧效果的旋转加载动画：

此处用到CSS3的transform属性。

CSS3的变形（transform）属性让元素在一个坐标系统中变形。这个属性包含一系列变形函数，可以移动、旋转和缩放元素。
transform属性可用于内联元素和块元素。其默认值为none，表示不元素不进行变形。transform另一个属性值是一系列的<transform-function>。<transform-function>表示一个或多个变形函数，以空格分开；我们可以同时对一个元素进行变形的多种属性操作，如rotate、scale、translate等。以往我们叠加效果都是用逗号(“，”)隔开，但在transform中使用多个transform-function时却需要有空格隔开。
● 2D transform常用的transform-function的功能:
transform属性3D变形（3D transform）模块的一部分，也就是说所有的2D变形函数也包含于3D变形规范中。如此一来，CSS3变形中的函数根据不同的规范略有不同，下面列出的是变形中的2D和3D常用变形函数的功能，简单说明如下：

translate()：用来移动元素，可以根据X轴和Ｙ轴坐标重新定位元素位置。在此基础上有两个扩展函数：translateX()和translateY()。

scale()：用来缩小或放大元素，可以使用元素尺寸发生变化。在此基础上有两个扩展函数：scaleX()和scaleY()。 rotate()：用来旋转元素。

skew()：用来让元素倾斜。在此基础上有两个扩展函数：skewX()和skewY()。

matrix()：定义矩阵变形，基于X轴和Y轴坐标重新定位元素位置。
● 3D transform常用的transform-function的功能:
  translate3d()：移元素元素，用来指定一个3D变形移动位移量。
  translate()：指定3Ｄ位移在Ｚ轴的位移量。
  scale3d()：用来缩放一个元素。
  scaleZ():指定Z轴的缩放向量。
  rotate3d()：指定元素具有一个三维旋转的角度。
  rotateX()、rotateY()和rotateZ()：让元素具有一个旋转角度。
  perspective()：指定一个透视投影矩阵。
  matrix3d()：定义矩阵变形。

● transform-origin属性用来设置变换的原点。示例中代表旋转中心。

   #loader2,
   #loader2:before,
   #loader2:after 
     border-radius: 50%;
   
   #loader2:before,
   #loader2:after 
      position: absolute;
      content: '';
   
   #loader2:before 
     width: 5.2em;
     height: 10.2em;
     background: #ffffff;
     border-radius: 10.2em 0 0 10.2em;
     top: -0.1em;
     left: -0.1em;
     -webkit-transform-origin: 5.2em 5.1em;
     transform-origin: 5.2em 5.1em;
     -webkit-animation: load2 2s infinite ease 1.5s;
     animation: load2 2s infinite ease 1.5s;
    
    #loader2 
      font-size: 11px;
      text-indent: -99999em;
      margin: 20px 20px;
      position: relative;
      float: left;
      width: 10em;
      height: 10em;
      box-shadow: inset 0 0 0 1em #ff0f88;
    
    #loader2:after 
      width: 5.2em;
      height: 10.2em;
      background: #ffffff;
      border-radius: 0 10.2em 10.2em 0;
      top: -0.1em;
      left: 5.1em;
      -webkit-transform-origin: 0px 5.1em;
      transform-origin: 0px 5.1em;
      -webkit-animation: load2 2s infinite ease;
      animation: load2 2s infinite ease;
     
     @-webkit-keyframes load2 
        0% 
          -webkit-transform: rotate(0deg);
          transform: rotate(0deg);
        
        100% 
          -webkit-transform: rotate(360deg);
          transform: rotate(360deg);
        
    
    @keyframes load2 
       0% 
         -webkit-transform: rotate(0deg);
         transform: rotate(0deg);
       
       100% 
         -webkit-transform: rotate(360deg);
         transform: rotate(360deg);

3.大小不一的粒子旋转加载动画：

  #load3,
  #loader3 
   font-size: 20px;
   margin: 80px 50px;
   float: left;
   width: 1em;
   height: 1em;
   border-radius: 50%;
   position: relative;
   text-indent: -9999em;
   -webkit-animation: load3 1.3s infinite linear;
   animation: load3 1.3s infinite linear;
  
  @-webkit-keyframes load3 
     0%,
     100% 
       box-shadow: 0em -3em 0 0.2em #aaff00, 2em -2em 0 0em #aaff00,
                   3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0em 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                   -3em 0 0 -0.5em #aaff00, -2em -2em 0 0em #aaff00;
     
     12.5% 
       box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 0.2em #aaff00,
                   3em 0 0 0 #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                   -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     25% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 0em #aaff00,
                    3em 0 0 0.2em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     37.5% 
         box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                     3em 0 0 0 #aaff00, 2em 2em 0 0.2em #aaff00,
                     0 3em 0 0 #aaff00, -2em 2em 0 -0.5em #aaff00,
                     -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    50% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 0.2em #aaff00, -2em 2em 0 0 #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    62.5% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 0 #aaff00, -2em 2em 0 0.2em #aaff00,
                    -3em 0 0 0 #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    75% 
       box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                   3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                   -3em 0 0 0.2em #aaff00, -2em -2em 0 0 #aaff00;
    
    87.5% 
       box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 -0.5em #aaff00,
                   3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                   -3em 0 0 0 #aaff00, -2em -2em 0 0.2em #aaff00;
    
  
  @keyframes load3 
    0%,
    100% 
        box-shadow: 0 -3em 0 0.2em #aaff00, 2em -2em 0 0 #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 0 #aaff00;
    
    12.5% 
        box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 0.2em #aaff00,
                    3em 0 0 0 #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    25% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 0 #aaff00,
                    3em 0 0 0.2em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    37.5% 
       box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                   3em 0 0 0 #aaff00, 2em 2em 0 0.2em #aaff00,
                   0 3em 0 0 #aaff00, -2em 2em 0 -0.5em #aaff00,
                   -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     50% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 0.2em #aaff00, -2em 2em 0 0 #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     62.5% 
         box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                     3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                     0 3em 0 0 #aaff00, -2em 2em 0 0.2em #aaff00,
                     -3em 0 0 0 #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    75% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                    -3em 0 0 0.2em #aaff00, -2em -2em 0 0 #aaff00;
     
     87.5% 
         box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 -0.5em #aaff00,
                     3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                     0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                     -3em 0 0 0 #aaff00, -2em -2em 0 0.2em #aaff00;

4.蛇形旋转加载动画：

  #loader4 
    font-size: 10px;
    margin: 20px 20px;
    float: left;
    text-indent: -9999em;
    width: 11em;
    height: 11em;
    border-radius: 50%;
    background: #ffffff;
    background: -moz-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: -webkit-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: -o-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: -ms-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: linear-gradient(to right, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    position: relative;
    -webkit-animation: load4 1.4s infinite linear;
    animation: load4 1.4s infinite linear;
  
  #loader4:before 
    width: 50%;
    height: 50%;
    background: #ff00ff;
    border-radius: 100% 0 0 0;
    position: absolute;
    top: 0;
    left: 0;
    content: '';
  
  #loader4:after 
    background: #ffffff;
    width: 75%;
    height: 75%;
    border-radius: 50%;
    content: '';
    margin: auto;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
  
  @-webkit-keyframes load4 
    0% 
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
    
    100% 
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    
  
  @keyframes load4 
    0% 
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
    
    100% 
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);

5.大小相同，颜色深浅不一的粒子旋转动画：

它是运用CSS3的border-radius圆角属性、box-shadow阴影属性等属性制作出来的。

animation属性设置的参数：

● 设置对象所应用的动画名称：load5。

● 设置对象动画的持续时间：1.1s。

● 设置对象动画的过渡类型：

ease：动画以低速开始，然后加快，在结束前变慢。

linear：匀速。

ease-in：动画以低速开始。

ease-out：动画以低速结束。

ease-in-out：动画以低速开始和结束，相对于ease缓慢，速度更均匀。

step-start：按keyframes设置逐帧显示，第一帧为keyframes设置的第一帧。

step-end：按keyframes设置逐帧显示，第一帧为样式的初始值。

steps(<number>[, [ start | end ] ]?)：把keyframes里设置的一帧等分为几帧，start为第一次显示第一帧，end第一次显示样式的初始值，例如：steps(4,start)。

cubic-bezier(<number>, <number>, <number>, <number>)：在 cubic-bezier 函数中自己的值。可能的值是从 0 到 1 的数值。贝兹曲线限制了首尾两控制点的位置，通过调整中间两控制点的位置可以灵活得到常用的动画效果。

● 设置对象动画的循环次数：infinite（无限循环）。

将动画运行整个过程的分为0%，12.5%，25%，37.5%，50%，62.5%，75%，87.5%，100%这8个阶段，在不同的阶段运用颜色的透明度制作出不同的阴影效果。

 #load5,
 #loader5 
   margin: 80px 50px;
   float: left;
   font-size: 25px;
   width: 1em;
   height: 1em;
   border-radius: 50%;
   position: relative;
   text-indent: -9999em;
   -webkit-animation: load5 1.1s infinite ease;
   animation: load5 1.1s infinite ease;
 
 @-webkit-keyframes load5 
   0%,
   100% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 1), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.5), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7);
   
   12.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.7), 1.8em -1.8em 0 0 rgba(128, 0, 255, 1),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.5);
   
   25% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.5), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   37.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0em rgba(128, 0, 255, 0.5),
                  2.5em 0em 0 0 rgba(128, 0, 255, 0.7), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   50% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.7),
                  0 2.5em 0 0 rgba(128, 0, 255, 1), -1.8em 1.8em 0 0 rgba(128, 255, 0, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   62.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.5),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.7), -1.8em 1.8em 0 0 rgba(128, 0, 255, 1),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   75% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.5), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.7),
                   -2.6em 0 0 0 rgba(128, 0, 255, 1), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   87.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.5),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.7), -1.8em -1.8em 0 0 rgba(128, 0, 255, 1);
   
 
 @keyframes load5 
   0%,
   100% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 1), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.5), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7);
   
   12.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.7), 1.8em -1.8em 0 0 rgba(128, 0, 255, 1),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.5);
   
   25% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.5), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   37.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0em rgba(128, 0, 255, 0.5),
                  2.5em 0em 0 0 rgba(128, 0, 255, 0.7), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   50% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.7),
                  0 2.5em 0 0 rgba(128, 0, 255, 1), -1.8em 1.8em 0 0 rgba(128, 255, 0, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   62.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.5),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.7), -1.8em 1.8em 0 0 rgba(128, 0, 255, 1),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   75% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.5), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.7),
                   -2.6em 0 0 0 rgba(128, 0, 255, 1), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   87.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.5),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.7), -1.8em -1.8em 0 0 rgba(128, 0, 255, 1);

6.粒子旋转伸缩加载动画：

运用CSS3的旋转Transform属性和动画的执行百分比制作而成。

 #loader6 
  margin: 60px 50px;
  float: left;
  font-size: 90px;
  text-indent: -9999em;
  overflow: hidden;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: relative;
  -webkit-animation: load6 1.7s infinite ease;
  animation: load6 1.7s infinite ease;
 
 @-webkit-keyframes load6 
    0% 
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                  -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                  -0.11em -0.83em 0 -0.477em #ff0000;
      
    5%,
    95% 
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                  -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                  -0.11em -0.83em 0 -0.477em #ff0000;
    
    30% 
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.51em -0.66em 0 -0.42em #ff0000,
                  -0.75em -0.36em 0 -0.44em #ff0000, -0.83em -0.03em 0 -0.46em #ff0000,
                  -0.81em 0.21em 0 -0.477em #ff0000;
    
    55% 
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.29em -0.78em 0 -0.42em #ff0000,
                  -0.43em -0.72em 0 -0.44em #ff0000, -0.52em -0.65em 0 -0.46em #ff0000,
                  -0.57em -0.61em 0 -0.477em #ff0000;
    
    100% 
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                  -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                  -0.11em -0.83em 0 -0.477em #ff0000;
    
 
@keyframes load6 
  0% 
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                -0.11em -0.83em 0 -0.477em #ff0000;
    
  5%,
  95% 
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                -0.11em -0.83em 0 -0.477em #ff0000;
  
  30% 
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.51em -0.66em 0 -0.42em #ff0000,
                -0.75em -0.36em 0 -0.44em #ff0000, -0.83em -0.03em 0 -0.46em #ff0000,
                -0.81em 0.21em 0 -0.477em #ff0000;
  
  55% 
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.29em -0.78em 0 -0.42em #ff0000,
                -0.43em -0.72em 0 -0.44em #ff0000, -0.52em -0.65em 0 -0.46em #ff0000,
                -0.57em -0.61em 0 -0.477em #ff0000;
  
  100% 
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                -0.11em -0.83em 0 -0.477em #ff0000;

7.横向粒子变动加载动画：

此处用到了CSS3动画animation属性的animation-fill-mode属性和animation-delay属性。
● animation-fill-mode属性规定动画在播放之前或之后，其动画效果是否可见。
none：不改变默认行为。

forwards：当动画完成后，保持最后一个属性值（在最后一个关键帧中定义）。

backwards：在animation-delay所指定的一段时间内，在动画显示之前，应用开始属性值（在第一个关键帧

中定义）。

both：向前和向后填充模式都被应用。

● animation-delay属性定义动画何时开始。该属性允许负值，示例中延迟0.16s执行动画。

#loader7:before,
#loader7:after,
#loader7 
  border-radius: 50%;
  width: 2.5em;
  height: 2.5em;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation: load7 1.8s infinite ease-in-out;
  animation: load7 1.8s infinite ease-in-out;

#loader7 
  margin: 60px 50px;
  float: left;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  -webkit-animation-delay: 0.16s;
  animation-delay: 0.16s;

#loader7:before 
  left: -3.5em;

#loader7:after 
  left: 3.5em;
  -webkit-animation-delay: 0.32s;
  animation-delay: 0.32s;

#loader7:before,
#loader7:after 
  content: '';
  position: absolute;
  top: 0;

@-webkit-keyframes load7 
  0%,
  80%,
  100% 
    box-shadow: 0 2.5em 0 -1.3em #000000;
  
  40% 
    box-shadow: 0 2.5em 0 0 #000000;
  

@keyframes load7 
  0%,
  80%,
  100% 
    box-shadow: 0 2.5em 0 -1.3em #000000;
  
  40% 
    box-shadow: 0 2.5em 0 0 #000000;

8.圆环旋转加载动画：

#loader8 
  margin: 30px 50px;
  float: left;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 1.1em solid rgba(255, 128, 0, 0.2);
  border-right: 1.1em solid rgba(255, 128, 0, 0.2);
  border-bottom: 1.1em solid rgba(255, 128, 0, 0.2);
  border-left: 1.1em solid rgba(255, 128, 0, 1);
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;

#loader8,
#loader8:after 
  border-radius: 50%;
  width: 10em;
  height: 10em;

@-webkit-keyframes load8 
  0% 
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  
  100% 
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  

@keyframes load8 
  0% 
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  
  100% 
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);

完整的示例Demo：

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>CSS3绘制加载动画</title>
  <style>
  #loader1,
  #loader1:before,
  #loader1:after 
     background: #f2fa08;
     -webkit-animation: load1 1s infinite ease-in-out;
     animation: load1 1s infinite ease-in-out;
     width: 1em;
     height: 4em;
   
   #loader1:before,
   #loader1:after 
     position: absolute;
     top: 0;
     content: '';
   
   #loader1:before 
     left: -1.5em;
   
   #loader1 
     text-indent: -9999em;
     margin: 50px 50px;
     position: relative;
     float: left;
     font-size: 11px;
     -webkit-animation-delay: 0.16s;
     animation-delay: 0.16s;
   
   #loader1:after 
     left: 1.5em;
     -webkit-animation-delay: 0.32s;
     animation-delay: 0.32s;
   
   @-webkit-keyframes load1 
     0%,
     80%,
     100% 
       box-shadow: 0 0 #f2fa08;
       height: 4em;
     
     40% 
       box-shadow: 0 -2em #f2fa08;
       height: 5em;
     
   
   @keyframes load1 
     0%,
     80%,
     100% 
       box-shadow: 0 0 #f2ff08;
       height: 4em;
     
     40% 
       box-shadow: 0 -2em #f2ff08;
       height: 5em;
     
   

   #loader2,
   #loader2:before,
   #loader2:after 
     border-radius: 50%;
   
   #loader2:before,
   #loader2:after 
      position: absolute;
      content: '';
   
   #loader2:before 
     width: 5.2em;
     height: 10.2em;
     background: #ffffff;
     border-radius: 10.2em 0 0 10.2em;
     top: -0.1em;
     left: -0.1em;
     -webkit-transform-origin: 5.2em 5.1em;
     transform-origin: 5.2em 5.1em;
     -webkit-animation: load2 2s infinite ease 1.5s;
     animation: load2 2s infinite ease 1.5s;
    
    #loader2 
      font-size: 11px;
      text-indent: -99999em;
      margin: 20px 20px;
      position: relative;
      float: left;
      width: 10em;
      height: 10em;
      box-shadow: inset 0 0 0 1em #ff0f88;
    
    #loader2:after 
      width: 5.2em;
      height: 10.2em;
      background: #ffffff;
      border-radius: 0 10.2em 10.2em 0;
      top: -0.1em;
      left: 5.1em;
      -webkit-transform-origin: 0px 5.1em;
      transform-origin: 0px 5.1em;
      -webkit-animation: load2 2s infinite ease;
      animation: load2 2s infinite ease;
     
     @-webkit-keyframes load2 
        0% 
          -webkit-transform: rotate(0deg);
          transform: rotate(0deg);
        
        100% 
          -webkit-transform: rotate(360deg);
          transform: rotate(360deg);
        
    
    @keyframes load2 
       0% 
         -webkit-transform: rotate(0deg);
         transform: rotate(0deg);
       
       100% 
         -webkit-transform: rotate(360deg);
         transform: rotate(360deg);
       
   

  #load3,
  #loader3 
   font-size: 20px;
   margin: 80px 50px;
   float: left;
   width: 1em;
   height: 1em;
   border-radius: 50%;
   position: relative;
   text-indent: -9999em;
   -webkit-animation: load3 1.3s infinite linear;
   animation: load3 1.3s infinite linear;
  
  @-webkit-keyframes load3 
     0%,
     100% 
       box-shadow: 0em -3em 0 0.2em #aaff00, 2em -2em 0 0em #aaff00,
                   3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0em 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                   -3em 0 0 -0.5em #aaff00, -2em -2em 0 0em #aaff00;
     
     12.5% 
       box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 0.2em #aaff00,
                   3em 0 0 0 #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                   -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     25% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 0em #aaff00,
                    3em 0 0 0.2em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     37.5% 
         box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                     3em 0 0 0 #aaff00, 2em 2em 0 0.2em #aaff00,
                     0 3em 0 0 #aaff00, -2em 2em 0 -0.5em #aaff00,
                     -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    50% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 0.2em #aaff00, -2em 2em 0 0 #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    62.5% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 0 #aaff00, -2em 2em 0 0.2em #aaff00,
                    -3em 0 0 0 #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    75% 
       box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                   3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                   -3em 0 0 0.2em #aaff00, -2em -2em 0 0 #aaff00;
    
    87.5% 
       box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 -0.5em #aaff00,
                   3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                   0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                   -3em 0 0 0 #aaff00, -2em -2em 0 0.2em #aaff00;
    
  
  @keyframes load3 
    0%,
    100% 
        box-shadow: 0 -3em 0 0.2em #aaff00, 2em -2em 0 0 #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 0 #aaff00;
    
    12.5% 
        box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 0.2em #aaff00,
                    3em 0 0 0 #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    25% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 0 #aaff00,
                    3em 0 0 0.2em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 -0.5em #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    37.5% 
       box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                   3em 0 0 0 #aaff00, 2em 2em 0 0.2em #aaff00,
                   0 3em 0 0 #aaff00, -2em 2em 0 -0.5em #aaff00,
                   -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     50% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 0 #aaff00,
                    0 3em 0 0.2em #aaff00, -2em 2em 0 0 #aaff00,
                    -3em 0 0 -0.5em #aaff00, -2em -2em 0 -0.5em #aaff00;
     
     62.5% 
         box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                     3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                     0 3em 0 0 #aaff00, -2em 2em 0 0.2em #aaff00,
                     -3em 0 0 0 #aaff00, -2em -2em 0 -0.5em #aaff00;
    
    75% 
        box-shadow: 0 -3em 0 -0.5em #aaff00, 2em -2em 0 -0.5em #aaff00,
                    3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                    0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                    -3em 0 0 0.2em #aaff00, -2em -2em 0 0 #aaff00;
     
     87.5% 
         box-shadow: 0 -3em 0 0 #aaff00, 2em -2em 0 -0.5em #aaff00,
                     3em 0 0 -0.5em #aaff00, 2em 2em 0 -0.5em #aaff00,
                     0 3em 0 -0.5em #aaff00, -2em 2em 0 0 #aaff00,
                     -3em 0 0 0 #aaff00, -2em -2em 0 0.2em #aaff00;
    
  

  #loader4 
    font-size: 10px;
    margin: 20px 20px;
    float: left;
    text-indent: -9999em;
    width: 11em;
    height: 11em;
    border-radius: 50%;
    background: #ffffff;
    background: -moz-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: -webkit-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: -o-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: -ms-linear-gradient(left, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    background: linear-gradient(to right, #ff00ff 10%, rgba(255, 255, 255, 0) 42%);
    position: relative;
    -webkit-animation: load4 1.4s infinite linear;
    animation: load4 1.4s infinite linear;
  
  #loader4:before 
    width: 50%;
    height: 50%;
    background: #ff00ff;
    border-radius: 100% 0 0 0;
    position: absolute;
    top: 0;
    left: 0;
    content: '';
  
  #loader4:after 
    background: #ffffff;
    width: 75%;
    height: 75%;
    border-radius: 50%;
    content: '';
    margin: auto;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
  
  @-webkit-keyframes load4 
    0% 
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
    
    100% 
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    
  
  @keyframes load4 
    0% 
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
    
    100% 
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
    
  

 #load5,
 #loader5 
   margin: 80px 50px;
   float: left;
   font-size: 25px;
   width: 1em;
   height: 1em;
   border-radius: 50%;
   position: relative;
   text-indent: -9999em;
   -webkit-animation: load5 1.1s infinite ease;
   animation: load5 1.1s infinite ease;
 
 @-webkit-keyframes load5 
   0%,
   100% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 1), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.5), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7);
   
   12.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.7), 1.8em -1.8em 0 0 rgba(128, 0, 255, 1),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.5);
   
   25% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.5), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   37.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0em rgba(128, 0, 255, 0.5),
                  2.5em 0em 0 0 rgba(128, 0, 255, 0.7), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   50% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.7),
                  0 2.5em 0 0 rgba(128, 0, 255, 1), -1.8em 1.8em 0 0 rgba(128, 255, 0, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   62.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.5),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.7), -1.8em 1.8em 0 0 rgba(128, 0, 255, 1),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   75% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.5), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.7),
                   -2.6em 0 0 0 rgba(128, 0, 255, 1), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   87.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.5),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.7), -1.8em -1.8em 0 0 rgba(128, 0, 255, 1);
   
 
 @keyframes load5 
   0%,
   100% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 1), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.5), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7);
   
   12.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.7), 1.8em -1.8em 0 0 rgba(128, 0, 255, 1),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.5);
   
   25% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.5), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.7),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   37.5% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0em rgba(128, 0, 255, 0.5),
                  2.5em 0em 0 0 rgba(128, 0, 255, 0.7), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                  0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   50% 
      box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                  2.5em 0 0 0 rgba(128, 0, 255, 0.5), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.7),
                  0 2.5em 0 0 rgba(128, 0, 255, 1), -1.8em 1.8em 0 0 rgba(128, 255, 0, 0.2),
                  -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   62.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.5),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.7), -1.8em 1.8em 0 0 rgba(128, 0, 255, 1),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.2), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   75% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.5), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.7),
                   -2.6em 0 0 0 rgba(128, 0, 255, 1), -1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2);
   
   87.5% 
       box-shadow: 0 -2.6em 0 0 rgba(128, 0, 255, 0.2), 1.8em -1.8em 0 0 rgba(128, 0, 255, 0.2),
                   2.5em 0 0 0 rgba(128, 0, 255, 0.2), 1.75em 1.75em 0 0 rgba(128, 0, 255, 0.2),
                   0 2.5em 0 0 rgba(128, 0, 255, 0.2), -1.8em 1.8em 0 0 rgba(128, 0, 255, 0.5),
                   -2.6em 0 0 0 rgba(128, 0, 255, 0.7), -1.8em -1.8em 0 0 rgba(128, 0, 255, 1);
   
 

#loader6 
  margin: 60px 50px;
  float: left;
  font-size: 90px;
  text-indent: -9999em;
  overflow: hidden;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  position: relative;
  -webkit-animation: load6 1.7s infinite ease;
  animation: load6 1.7s infinite ease;
 
 @-webkit-keyframes load6 
    0% 
      -webkit-transform: rotate(0deg);
      transform: rotate(0deg);
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                  -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                  -0.11em -0.83em 0 -0.477em #ff0000;
      
    5%,
    95% 
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                  -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                  -0.11em -0.83em 0 -0.477em #ff0000;
    
    30% 
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.51em -0.66em 0 -0.42em #ff0000,
                  -0.75em -0.36em 0 -0.44em #ff0000, -0.83em -0.03em 0 -0.46em #ff0000,
                  -0.81em 0.21em 0 -0.477em #ff0000;
    
    55% 
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.29em -0.78em 0 -0.42em #ff0000,
                  -0.43em -0.72em 0 -0.44em #ff0000, -0.52em -0.65em 0 -0.46em #ff0000,
                  -0.57em -0.61em 0 -0.477em #ff0000;
    
    100% 
      -webkit-transform: rotate(360deg);
      transform: rotate(360deg);
      box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                  -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                  -0.11em -0.83em 0 -0.477em #ff0000;
    
 
@keyframes load6 
  0% 
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                -0.11em -0.83em 0 -0.477em #ff0000;
    
  5%,
  95% 
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                -0.11em -0.83em 0 -0.477em #ff0000;
  
  30% 
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.51em -0.66em 0 -0.42em #ff0000,
                -0.75em -0.36em 0 -0.44em #ff0000, -0.83em -0.03em 0 -0.46em #ff0000,
                -0.81em 0.21em 0 -0.477em #ff0000;
  
  55% 
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.29em -0.78em 0 -0.42em #ff0000,
                -0.43em -0.72em 0 -0.44em #ff0000, -0.52em -0.65em 0 -0.46em #ff0000,
                -0.57em -0.61em 0 -0.477em #ff0000;
  
  100% 
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
    box-shadow: -0.11em -0.83em 0 -0.4em #ff0000, -0.11em -0.83em 0 -0.42em #ff0000,
                -0.11em -0.83em 0 -0.44em #ff0000, -0.11em -0.83em 0 -0.46em #ff0000,
                -0.11em -0.83em 0 -0.477em #ff0000;
  


#loader7:before,
#loader7:after,
#loader7 
  border-radius: 50%;
  width: 2.5em;
  height: 2.5em;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation: load7 1.8s infinite ease-in-out;
  animation: load7 1.8s infinite ease-in-out;

#loader7 
  margin: 60px 50px;
  float: left;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  -webkit-animation-delay: 0.16s;
  animation-delay: 0.16s;

#loader7:before 
  left: -3.5em;

#loader7:after 
  left: 3.5em;
  -webkit-animation-delay: 0.32s;
  animation-delay: 0.32s;

#loader7:before,
#loader7:after 
  content: '';
  position: absolute;
  top: 0;

@-webkit-keyframes load7 
  0%,
  80%,
  100% 
    box-shadow: 0 2.5em 0 -1.3em #000000;
  
  40% 
    box-shadow: 0 2.5em 0 0 #000000;
  

@keyframes load7 
  0%,
  80%,
  100% 
    box-shadow: 0 2.5em 0 -1.3em #000000;
  
  40% 
    box-shadow: 0 2.5em 0 0 #000000;
  


#loader8 
  margin: 30px 50px;
  float: left;
  font-size: 10px;
  position: relative;
  text-indent: -9999em;
  border-top: 1.1em solid rgba(255, 128, 0, 0.2);
  border-right: 1.1em solid rgba(255, 128, 0, 0.2);
  border-bottom: 1.1em solid rgba(255, 128, 0, 0.2);
  border-left: 1.1em solid rgba(255, 128, 0, 1);
  -webkit-animation: load8 1.1s infinite linear;
  animation: load8 1.1s infinite linear;

#loader8,
#loader8:after 
  border-radius: 50%;
  width: 10em;
  height: 10em;

@-webkit-keyframes load8 
  0% 
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  
  100% 
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  

@keyframes load8 
  0% 
    -webkit-transform: rotate(0deg);
    transform: rotate(0deg);
  
  100% 
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  

  </style>
</head>
<body>
  <div id="loader1" ></div>
  <div id="loader2" ></div>
  <div id="loader3" ></div>
  <div id="loader4" ></div>
  <div id="loader5" ></div>
  <div id="loader6" ></div>
  <div id="loader7" ></div>
  <div id="loader8" ></div>
</body>
</html>

参考文档：

http://www.webhek.com/misc/css-loaders

http://www.w3cplus.com/css3/transform-origin.html

http://www.w3school.com.cn/css3/css3_animation.asp

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