css3中animation的应用

div
{
animation-name: myfirst; //动画的名称
animation-duration: 5s;  //动画一个周期需要5秒
animation-timing-function: linear; //动画运动速度的曲线动画从头到尾的速度是相同的。
animation-delay: 2s; //等待2s动画才开始
animation-iteration-count: infinite;//动画一直在持续，无数次
animation-direction: alternate;//动画结束后再反向循环
animation-play-state: running;//规定动画是在运行
/* Firefox: */
-moz-animation-name: myfirst;
-moz-animation-duration: 5s;
-moz-animation-timing-function: linear;
-moz-animation-delay: 2s;
-moz-animation-iteration-count: infinite;
-moz-animation-direction: alternate;
-moz-animation-play-state: running;
/* Safari 和 Chrome: */
-webkit-animation-name: myfirst;
-webkit-animation-duration: 5s;
-webkit-animation-timing-function: linear;
-webkit-animation-delay: 2s;
-webkit-animation-iteration-count: infinite;
-webkit-animation-direction: alternate;
-webkit-animation-play-state: running;
/* Opera: */
-o-animation-name: myfirst;
-o-animation-duration: 5s;
-o-animation-timing-function: linear;
-o-animation-delay: 2s;
-o-animation-iteration-count: infinite;
-o-animation-direction: alternate;
-o-animation-play-state: running;
}

@keyframes myfirst
{
0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}

@-moz-keyframes myfirst /* Firefox */
{
0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}

@-webkit-keyframes myfirst /* Safari and Chrome */
{
0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}

@-o-keyframes myfirst /* Opera */
{
0% {background:red; left:0px; top:0px;}
25% {background:yellow; left:200px; top:0px;}
50% {background:blue; left:200px; top:200px;}
75% {background:green; left:0px; top:200px;}
100% {background:red; left:0px; top:0px;}
}