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判断鼠标从哪个方向进入容器

<!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="http://common.cnblogs.com/script/jquery.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;    console.log("方向是:"+direction); //输出方向 0 1 2 3    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>

 

判断鼠标从哪个方向进入容器