图片旋转处理js_JavaScript

图片旋转处理js

<html>
<head>
<title></title>
<script type="text/javascript">
function rotateImage(HTMLControlID,degree) {
if(window.navigator.userAgent.indexOf('MSIE') > -1)
{
//处理IE浏览器
var imageToRotate = document.getElementById(HTMLControlID);

imageToRotate.style.filter= "progid:DXImageTransform.Microsoft.Matrix(sizingMethod='auto expand')";
var deg2radians = Math.PI * 2 / 360;
var degreeToRotate =degree // 旋转度数;
rad = degreeToRotate * deg2radians ;
costheta = Math.cos(rad);
sintheta = Math.sin(rad);

imageToRotate.filters.item(0).M11 = costheta;
imageToRotate.filters.item(0).M12 = -sintheta;
imageToRotate.filters.item(0).M21 = sintheta;
imageToRotate.filters.item(0).M22 = costheta;

var w=document.getElementById(HTMLControlID).width;
var h=document.getElementById(HTMLControlID).height;

document.getElementById(HTMLControlID).width=h;
document.getElementById(HTMLControlID).height=w;
n+=1;
if(n<2)
{
rotateImage(HTMLControlID,degree);
}
else
{
n=0;
}

}
}
</script>
</head>

<body>
<table width="100%" height="100%" border="0">
<tr><td>
<A href="javascript:rotateImage('imgRotate' , 90);">旋转90度</A>
<A href="javascript:rotateImage('imgRotate' , 180);">旋转180度</A>
<A href="javascript:rotateImage('imgRotate' , 270);">旋转270度</A>
<A href="javascript:rotateImage('imgRotate' , 360);">原图</A></td></tr>
<tr><td>
<canvas id="canvas" ><img id="imgRotate" src="bd8dcf53-3c57-49cd-8221-0ffc03a155dc.jpg" />
</canvas></td></tr></table>
</body>
</html>
<script>
var n=0;
</script>