位于图片左侧还是右侧
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
.arrow-right {
cursor: help;
}
.arrow-left {
cursor: crosshair;
}
</style>
</head>
<body>
<img src="http://pic002.cnblogs.com/images/2012/382256/2012080118323766.gif" width="300" height="225">
<script src="http://upcdn.b0.upaiyun.com/libs/jquery/jquery-2.0.3.min.js"></script>
<script>
var $img = $('img')
var position = $img.offset().left + $img.width() / 2
$img.bind('mousemove', function(e) {
e || (e = window.event)
if (e.pageX < position) {
$img[0].className = 'arrow-left'
} else {
$img[0].className = 'arrow-right'
}
})
</script>
</body>
</html>
