DeviceMotionEvent.rotationRate - Web APIs 编辑

Returns the rate at which the device is rotating around each of its axes in degrees per second.

Note: If the hardware isn't capable of providing this information, this property returns null.

Syntax

var rotationRate = deviceMotionEvent.rotationRate;

The rotationRate property is a read only object describing the rotation rates of the device around each of its axes:

alpha: The rate at which the device is rotating about its Z axis; that is, being twisted about a line perpendicular to the screen.
beta: The rate at which the device is rotating about its X axis; that is, front to back.
gamma: The rate at which the device is rotating about its Y axis; that is, side to side.

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

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