当判断是否应该发生与另一个 Collider2D 的碰撞时，此 Collider2D 应该包含的附加层。
层碰撞矩阵定义了哪些层可以与其他层发生碰撞，哪些层不能。此属性允许您指定此特定 Collider2D 实例可以接触的附加层。
注意：因为层可以根据每个 Collider2D 实例的设置不同地包含或排除，所以当两个 Collider2D 实例发生碰撞时，可能会发生关于是否应该发生碰撞的冲突决定。您可以在 Collider2D.layerOverridePriority 文档中找到 Unity 如何仲裁此决定的详细规则。
其他资源：Collider2D.excludeLayers、Rigidbody2D.includeLayers 和 Rigidbody2D.excludeLayers。
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