Returns the rotation angle, in degrees, of the contact area ellipse defined by
Touch.radiusX
and
Touch.radiusY
. The value may be between 0 and 90. Together, these three values describe an ellipse that approximates the size and shape of the area of contact between the user and the screen. This may be a relatively large ellipse representing the contact between a fingertip and the screen or a small area representing the tip of a stylus, for example.
注意： This attribute has not been formally standardized. It is specified in the Touch Events – Level 2 草案 specification and not in 触摸事件 推荐 . This attribute is not widely implemented.
var angle = touchItem.rotationAngle;
angle
The number of degrees of rotation to apply to the described ellipse to align with the contact area between the user and the touch surface.
Touch.radiusX example includes an example of this property's usage.
| 规范 | 状态 | 注释 |
|---|---|---|
| Touch Events – Level 2 | 草案 | 非稳定版本。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
rotationAngle
|
Chrome 43 | Edge ≤79 | Firefox ? | IE No | Opera Yes | Safari No | WebView Android 43 | Chrome Android 43 | Firefox Android Yes | Opera Android Yes | Safari iOS Yes | Samsung Internet Android 4.0 |
完整支持
不支持
兼容性未知
实验。期望将来行为有所改变。