css3 写小鸟的核心原理是用到了css3 的自定义动画属性keyframes ，它很灵活，允许你创建更多不一样的动画效果。写法

@keyframes myName

{

0% {xxxx}

10% {xxxx}

20% {xxxx}

30% {xxxx}

}

小鸟的代码片段是这样的，通过调用不同的背景图片

@keyframes myFrist

{

0% {background:url(images/bird1.png);background-size: 100% 100%}

12.5% {background:url(images/bird2.png);background-size: 100% 100%}

25% {background:url(images/bird3.png);background-size: 100% 100%}

37.5% {background:url(images/bird4.png);background-size: 100% 100%}

50% {background:url(images/bird5.png);background-size: 100% 100%}

65.7% {background:url(images/bird6.png);background-size: 100% 100%}

75% {background:url(images/bird7.png);background-size: 100% 100%}

87.5% {background:url(images/bird8.png);background-size: 100% 100%}

100% {background:url(images/bird1.png);background-size: 100% 100%}

}

演示

http://developer.qietu.com/p/css3bird/

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