用于选择哪些层可以在摄像机上触发事件的遮罩。
正如摄像机的 cullingMask 用于确定摄像机能否看到 GameObject 一样，事件遮罩用于确定 GameObject 能否收到鼠标事件。
只有通过摄像机能够看到并且其 layerMask 与摄像机的 eventMask 重叠的对象才能收到 OnMouseXXX 事件。
将该遮罩设置为零可提高性能，如果您不使用 OnMouseXXX 事件，建议使用该设置。
有关更多信息，请参阅 层。
另请参阅：MonoBehaviour.OnMouseEnter、MonoBehaviour.OnMouseExit、MonoBehaviour.OnMouseOver、
MonoBehaviour.OnMouseDown、MonoBehaviour.OnMouseOver、MonoBehaviour.OnMouseUp、
MonoBehaviour.OnMouseDrag、MonoBehaviour.OnMouseUpAsButton。
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