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<html> <head>鼠标离开方向检测</head> <body> <div id="msg">鼠标放到框上，然后移开。</div> <div id="wrap" style="width:200px; height: 100px; line-height:30px; margin: 100px auto; text-align: center; border: 1px solid #99bbe8;">↖↑↗<br/>← →<br/>↙↓↘</div> <script src="http://common.cnblogs.com/script/jquery.js"></script> <script> $("#wrap").on("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) / 45) + 3) % 8; var dirName = [‘右下‘, ‘下‘, ‘左下‘, ‘左‘, ‘左上‘, ‘上‘, ‘右上‘, ‘右‘]; if(e.type == ‘mouseenter‘){ $("#msg").html(dirName[direction]+‘-进入‘); }else{ $(‘#msg‘).html(dirName[direction]+‘-离开‘); } }); </script> </body> </html>
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原文地址：http://www.cnblogs.com/jununx/p/4472894.html
