要检测Android浏览器上的方向变化，请将侦听器附加到上的orientationchange或resize事件window：

// Detect whether device supports orientationchange event, otherwise fall back to
// the resize event.
var supportsOrientationChange = "onorientationchange" in window,
    orientationEvent = supportsOrientationChange ? "orientationchange" : "resize";

window.addEventListener(orientationEvent, function() {
    alert('HOLY ROTATING SCREENS BATMAN:' + window.orientation + " " + screen.width);
}, false);

检查window.orientation属性以找出设备的定向方向。使用Android手机，screen.width或者screen.height随着设备旋转而更新。（iPhone并非如此）。