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返回设备旋转时Y轴的值;即，多少度，介于之间-90和90，通过该装置被接通向左或向右。见方向和运动数据解释的细节。
Syntax
var gamma = orientationEvent.gamma;
Specifications
| Specification | Status | Comment |
|---|---|---|
| 设备方向事件 | {Spec2('Device Orientation')}} | Initial specification. |
Browser compatibility
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
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| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 7.0 | (Yes) | 6 [1] | ? | ? | ? |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 3.0 | (Yes) | 6 [1] | 未实现 | 未实现 | 4.2 |
[1]火狐3.6，图4和5支撑mozOrientation而不是标准DeviceOrientationEvent接口