DeviceOrientationEvent.alpha

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;

Specification	Status	Comment
DeviceOrientation Event Specification	Editor's Draft	Initial specification.

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`alpha` Experimental	Chrome Full support 7	Edge Full support 12	Firefox Full support 6	IE ?	Opera Full support Yes	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 6	Opera Android No support No	Safari iOS Full support 4.2	Samsung Internet Android Full support Yes

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.