layer.originX < number>

Sets the x origin for scale, rotate and skew transformations. The origin is defined as a number, where 0 is the left edge of the layer and 1 the right edge. The default value is 0.5, the center of the layer.
译：设置规模，旋转和倾斜转换的X-起源。原点被定义为1和0之间，其中0是该层的左边缘和1的右边缘。默认值是0.5，该层的中心。

layerA = new Layer
layerA.rotation = 45
layerA.originX = 0
layerA.originX = 1