The PrefabStage class represents an editing context for Prefab Assets.
阶段是包括场景集合的编辑上下文。主要阶段包含所有当前打开的常规场景，而预制件阶段包含仅用于编辑预制件的预览场景。
预制件模式下在 Scene 视图中显示的每个示踪导航都代表一个阶段。带有预制件图标的示踪导航代表预制件阶段。
| assetPath | The asset path where the Prefab Asset file is stored, relative to the project root. |
| mode | The Prefab Stage can be opened either in isolation or in context. |
| openedFromInstanceObject | A GameObject inside the Prefab instance that you opened Prefab Mode through. |
| openedFromInstanceRoot | The root of the Prefab instance that you opened Prefab Mode through. |
| prefabContentsRoot | 已加载的预制件资源内容的根游戏对象。 |
| ClearDirtiness | 清除预制件阶段的脏 (dirtyness) 标志。 |
| IsPartOfPrefabContents | 此游戏对象是否是预制件阶段中加载的预制件资源内容的一部分？ |
| prefabSaved | 每当已保存预制件阶段的内容时都会调用的回调。 |
| prefabSaving | 每当即将保存预制件阶段的内容时都会调用的回调。 |
| prefabStageClosing | 每当即将打开预制件阶段时都会调用的回调。 |
| prefabStageDirtied | 每当预制件阶段从未修改变为已修改时调用的回调。 |
| prefabStageOpened | 每当已打开预制件阶段时都会调用的回调。 |
| hideFlags | 该对象应该隐藏、随场景一起保存还是由用户修改？ |
| name | 对象的名称。 |
| scene | The preview Scene this stage controls. Stage content should be moved into this Scene. |
| stageHandle | See Stage.stageHandle. |
| assetPath | The path of the Asset file associated with the stage, relative to the project root folder. |
| stageHandle | The StageHandle struct for this stage. |
| GetInstanceID | Gets the instance ID of the object. |
| ToString | 返回对象的名称。 |
| FindComponentOfType | 返回给定类型的第一个载入激活对象。 |
| FindComponentsOfType | 返回给定类型的所有载入激活对象的列表。 |
| GetCombinedSceneCullingMaskForCamera | Gets the Scene culling mask from this Stage. |
| OnCloseStage | Unity calls this method when the Stage is closed. Classes that inherit from PreviewSceneStage should implement cleanup logic in this method. |
| OnOpenStage | Unity calls this method when the Stage is opened. Classes that inherit from PreviewSceneStage should implement initialization logic in this method. |
| CreateHeaderContent | Creates the header content for this Stage. Both the Hierarchy window header and Scene view breadcrumb bar use this content. |
| GetHashForStateStorage | Unity calls this method to get a hash code that is used to save the state of the Stage to disk. |
| OnCloseStage | Unity calls this method when the Stage is closed. Classes that inherit from Stage should implement cleanup logic in this method. |
| OnDisable | 请参阅 ScriptableObject.OnDisable。 |
| OnEnable | 请参阅 ScriptableObject.OnEnable。 |
| OnFirstTimeOpenStageInSceneView | Unity calls this method the first time a Stage is opened for a specific Asset, for a specific Scene view. |
| OnOpenStage | Unity calls this method when the Stage is opened. Classes that inherit from Stage should implement initialization logic in this method. |
| OnReturnToStage | Unity calls this method when you return to a Stage that is already open. |
| Destroy | 移除 GameObject、组件或资源。 |
| DestroyImmediate | 立即销毁对象 /obj/。强烈建议您改用 Destroy。 |
| DontDestroyOnLoad | 在加载新的 Scene 时，请勿销毁 Object。 |
| FindAnyObjectByType | Retrieves any active loaded object of Type type. |
| FindFirstObjectByType | Retrieves the first active loaded object of Type type. |
| FindObjectsByType | Retrieves a list of all loaded objects of Type type. |
| Instantiate | 克隆 original 对象并返回克隆对象。 |
| CreateInstance | 创建脚本化对象的实例。 |
| bool | 该对象是否存在？ |
| operator != | 比较两个对象是否引用不同的对象。 |
| operator == | 比较两个对象引用，判断它们是否引用同一个对象。 |