参考网址
http://www.cnblogs.com/cjqa/p/4386489.html
http://blog.csdn.net/china_lzn/article/details/7553552（未测试）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" type="text/css" href="css/imgareaselect-default.css"/>
<script type="text/javascript" src="js/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="js/jquery.imgareaselect.min.js"></script>
</head>
<body>
<div class="frame" >
<img id="photo" src="./p_w_picpaths/b.jpg" />
</div>
<div id="preview" >
<img src="./p_w_picpaths/b.jpg" />
</div>
</body>
<script type="text/javascript">
function preview(img, selection) {
if (!selection.width || !selection.height) { return; }
var scaleX = 250 / selection.width;
var scaleY = 200 / selection.height;
var hei = $('#photo').height();
var wid = $('#photo').width();
$('#preview img').css({
width: Math.round(scaleX * wid),
height: Math.round(scaleY * hei),
marginLeft: -Math.round(scaleX * selection.x1),
marginTop: -Math.round(scaleY * selection.y1)
});
}
$(function () {
$('#photo').imgAreaSelect({
//aspectRatio: '1:1',
handles: true,
fadeSpeed: 200, onSelectChange: preview
});
});
</script>
</html>
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