将 Rigidbody2D 设置为具有运动行为。
运动行为将停止 Rigidbody2D 对重力作出反应或施加力，包括与其他 Kinematic 或 Static Rigidbody2D接触。
可以通过设置其 Rigidbody2D.velocity 或 Rigidbody2D.angularVelocity 或者通过显式重定位移动这种类型的 Rigidbody2D。
运动 Rigidbody2D 将只与动态 Rigidbody2D 刚体类型碰撞。Rigidbody2D.useFullKinematicContacts 设置为 true 时例外，在这种情况下，它将与所有其他 Rigidbody2D 刚体类型碰撞。
当附加的 Collider2D 设置为触发器时，它将始终为附加到所有其他 Rigidbody2D 刚体类型的任意 Collider2D 生成一个触发器。
另请参阅：Rigidbody2D.bodyType、Rigidbody2D.useFullKinematicContacts。
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