animation动画
lternate 原路，
0返回
infinite 无限次数不停
forwards 结束
both 起始和结束都设
animation-play-state: running; 鼠标移入开始动画
animation-play-state: paused; 鼠标移入停止
@keyframes 定义关键帧动画 moving 移动
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>animation动画</title>
<style type="text/css">
.box{
width: 100px;
height: 100px;
background-color: gold;
animation: moving 1s ease 1s 5 alternate both;
/*alternate 原路，0返回 infinite 无限次数不停 forwards 结束 both 起始和结束都设*/
}
.box:hover{
animation-play-state: paused;
/*animation-play-state: running; 鼠标移入开始动画*/
/*animation-play-state: paused; 鼠标移入停止
*/
}
/*@keyframes 定义关键帧动画 moving 移动
*/
@keyframes moving{
from{
width: 100px;
}
from{
width: 500px;
}
}
</style>
</head>
<body>
<div class="box">
</div>
</body>
</html>
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