<html>
<head>
<meta charset=UTF-8>
<title>YuGiOh</title>
<style type="text/css">
*{
margin:0
padding:0
}
#div {
position: absolute
top: 50px
left: 300px
width: 300px
height: 300px
line-height: 300px
text-align: center
border: 1px solid black
border-radius: 90px
}
</style>
<script type="text/javascript">
var deg = 0
var rotateHTML5 = function(limit) {
deg += limit
deg = deg > 360 ? 1 : deg
div.style['transform'] = div.style['-webkit-transform'] = 'rotate(' + deg + 'deg)'
}
var rotateIE = function(obj) {
var d = !! obj.d ? obj.d : 1
var r = d * Math.PI / 180
costheta = Math.cos(r)
sintheta = Math.sin(r)
obj.style.filter = "progid:DXImageTransform.Microsoft.Matrix()"
var item = obj.filters.item(0)
var width = obj.clientWidth
var height = obj.clientHeight
item.DX = -width / 2 * costheta + height / 2 * sintheta + width / 2
item.DY = -width / 2 * sintheta - height / 2 * costheta + height / 2
item.M11 = costheta
item.M12 = -sintheta
item.M21 = sintheta
item.M22 = costheta
obj.timer = setTimeout(function() {
var dx = d + 1
dx = dx > 360 ? 1 : dx
obj.d = dx
rotateIE(obj)
}, 30)
}
var start = function() {
if (!/.*MSIE.*/i.test(navigator.userAgent)) {
if ( !! div.interval) {
clearInterval(div.interval)
div.interval = null
} else {
div.interval = setInterval(function() {
rotateHTML5(1)
}, 30)
}
} else {
if ( !! div.timer) {
clearTimeout(div.timer)
div.timer = null
} else {
rotateIE(div)
}
}
}
</script>
</head>
<body>
<button onclick="start()">rotate</button>
<div id="div">ROTATE</div>
</body>
</html>
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