html5中的deviceorientation事件，此事件是檢測設備方向變化時的事件。其常用屬性爲alpha(x)、beta(y)、gamma(z)。
- alpha：左右旋轉
- beta：前後旋轉
gamma：扭轉（自轉）
<html> <head> <title>DeviceOrientationEvent</title> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"> <script src="js/common/jquery.min.js"></script> </head> <body> <div id="arrow"></div> </body> </html> <script> try { var text = ""; window.addEventListener("deviceorientation", orientationHandler, false); function orientationHandler(event) { text = "" var arrow = document.getElementById("arrow"); text += "左右旋轉：rotate alpha{" + Math.round(event.alpha) + "deg)<br>"; text += "前後旋轉：rotate beta{" + Math.round(event.beta) + "deg)<br>"; text += "扭轉設備：rotate gamma{" + Math.round(event.gamma) + "deg)<br>"; arrow.innerHTML = text; } } catch (e) { $("#arrow").html(e.message) } </script>