CSS3实现加载动画效果

　　纯css3实现的，动画效果很流畅，gif可能有点卡。

演示地址：http://www.sucaijiayuan.com/api/demo.php?url=/demo/20140410-1

原文地址：http://www.sucaijiayuan.com/Js/html5-css3/878.html

body {
    background: #222;
}
figure {
    position: absolute;
    margin: auto;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 6.250em;
    height: 6.250em;
    animation: rotate 2.4s linear infinite;
}
.white {
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    animation: flash 2.4s linear infinite;
    opacity: 0;
}
.dot {
    position: absolute;
    margin: auto;
    width: 2.4em;
    height: 2.4em;
    border-radius: 100%;
    transition: all 1s ease;
}
.dot:nth-child(2) {
    top: 0;
    bottom: 0;
    left: 0;
    background: #FF4444;
    animation: dotsY 2.4s linear infinite;
}
.dot:nth-child(3) {
    left: 0;
    right: 0;
    top: 0;
    background: #FFBB33;
    animation: dotsX 2.4s linear infinite;
}
.dot:nth-child(4) {
    top: 0;
    bottom: 0;
    right: 0;
    background: #99CC00;
    animation: dotsY 2.4s linear infinite;
}
.dot:nth-child(5) {
    left: 0;
    right: 0;
    bottom: 0;
    background: #33B5E5;
    animation: dotsX 2.4s linear infinite;
}
@keyframes rotate {
    0% {
    transform: rotate( 0 );
}
10% {
    width: 6.250em;
    height: 6.250em;
}
66% {
    width: 2.4em;
    height: 2.4em;
}
100% {
    transform: rotate(360deg);
    width: 6.250em;
    height: 6.250em;
}
} @keyframes dotsY {
    66% {
    opacity: .1;
    width: 2.4em;
}
77% {
    opacity: 1;
    width: 0;
}
}
@keyframes dotsX {
    66% {
    opacity: .1;
    height: 2.4em;
}
77% {
    opacity: 1;
    height: 0;
}
} @keyframes flash {
    33% {
    opacity: 0;
    border-radius: 0%;
}
55% {
    opacity: .6;
    border-radius: 100%;
}
66% {
    opacity: 0;
}
}