GestureEvent
非标准: 该特性尚未标准化。我们不建议在生产环境中使用非标准特性，因为它们在浏览器中的支持有限，且可能发生变化或被移除。不过，在没有标准选项的特定情况下，它们可以作为合适的替代方案。
GestureEvent 是 WebKit 的专有接口，提供多点触控的信息。这个接口的事件包括 gesturestart、gesturechange 和 gestureend.
构造函数
GestureEvent()-
Creates a
GestureEventobject.
属性
This interface also inherits properties of its parents, UIEvent and Event.
GestureEvent.rotation只读-
Change in rotation (in degrees) since the event's beginning. Positive values indicate clockwise rotation; negative values indicate anticlockwise rotation. Initial value:
0.0 GestureEvent.scale只读-
Distance between two digits since the event's beginning. Expressed as a floating-point multiple of the initial distance between the digits at the beginning of the gesture. Values below 1.0 indicate an inward pinch (zoom out). Values above 1.0 indicate an outward unpinch (zoom in). Initial value:
1.0
方法
This interface also inherits methods of its parents, UIEvent and Event.
GestureEvent.initGestureEvent()-
Initializes the value of an
GestureEvent. If the event has already being dispatched, this method does nothing.
手势事件类型
规范
不属于任何规范。苹果在 Safari Developer Library 中描述了这个接口。