二、正常情况下，transition是加到设置元素样试的CSS中的，而transform是添加到动态伪类选择器:hover后的
三、如果要实现鼠标悬停后元素旋转360不回去，可将transition也加到:hover后面
举例：
<style>
.bg{
width: 200px
height: 200px
margin: 10px
box-shadow: 0 1px 8px #666
}
.bg:hover{
transition: all 0.5s ease-in
transform:rotate(360deg)
}
</style>
<div class="bg"></div>
不知道是不是你要的效果，望采纳！！！
使用css3 属性方法 rotate() 实现旋转
transform-origin是规定如何旋转
: center center；为以围绕中心点旋转；
top left以围绕左上角旋转；
top right以围绕右上角旋转；
写了例子，效果不是很好，仅供参考
<!DOCTYPE html><html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html charset=utf-8">
<title>IE浏览器CSS transform旋转属性的演示</title>
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />
<style type="text/css">
body { font-family: "Arial", sans-serif }
#example {
position: absolute
top: 100px
left: 100px
border: #09f solid 1px
font-weight: 900
color: #09f
display: block
width: 200px
height: 200px
text-align:center
line-height:200px
cursor:pointer
}
</style>
</head>
<body>
<div id="example">.</div>
<script type="text/javascript">
function rotate(percent, scale){
var radian = Math.PI * percent
var angle = 180 * percent
var scale = 0.8
var style = document.getElementById("example").style
var transform = "rotate("+ angle +"deg) scale("+ scale +")"
style.filter = "progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand',M11="+Math.cos(radian)*scale+",M12="+(Math.sin(radian) * -1)*scale+",M21="+Math.sin(radian)*scale+",M22="+Math.cos(radian)*scale+")"
style.MozTransform = transform
style.WebkitTransform = transform
style.OTransform = transform
style.Transform = transform
}
i=0.25
setInterval("rotate(i)i+=0.01", 10)
</script>
</body>
</html>
