获取用于缩放的精密鼠标增量(只读)。
此属性会自动检测用户针对 X/Y 轴拖动的偏好设置,并向您返回
据此测量的浮点值。此属性还会正确处理修改键,
即增量已经乘以 acceleration。
另请参阅:acceleration、niceMouseDelta。
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