判断鼠标移入方向及移出方向

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>判断鼠标进入方向</title>
</head>
<body>
<style>
    html,body{margin:0;padding:0;}
    #wrap{width:300px;height:300px;background:#33aa00;margin:50px;display:inline-block;font-size:50px;text-align:center;line-height:300px;}
</style>
<div id="wrap">
    方向反馈
</div>
<script type="text/javascript" src="../lagou/js/jquery.min.js"></script>
<script>
    $("#wrap").bind("mouseenter mouseleave",
        function(e) {
            var w = $(this).width();
            var h = $(this).height();
            var x = (e.pageX - this.offsetLeft - (w / 2)) * (w > h ? (h / w) : 1);
            var y = (e.pageY - this.offsetTop - (h / 2)) * (h > w ? (w / h) : 1);
            var direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4;
            var eventType = e.type;
            var dirName = new Array('上方','右侧','下方','左侧');
            if(e.type == 'mouseenter'){
                $(this).html(dirName[direction]+'进入');
            }else{
                $(this).html(dirName[direction]+'离开');
            }
        });
</script>
</body>
</html>

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