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返回设备旋转时Z轴的值；即：设备围绕屏幕中心扭转的角度。 详细信息请查看方向和运动数据。
Syntax
var alpha = instanceOfDeviceOrientationEvent.alpha;
Specifications
| Specification | Status | Comment |
|---|---|---|
| DeviceOrientation Event Specification | Editor's Draft | Initial specification. |
Browser compatibility
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
alpha | Chrome Full support 7 | Edge Full support 12 | Firefox Full support 6 | IE No support No | Opera Full support Yes | Safari ? | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support 6 | Opera Android Full support Yes | Safari iOS Full support 4.2 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.