将此属性添加到脚本类，可将其 GameObject 标记为 Scene View 选取的选择基础对象。
In the Unity Scene View, when clicking to select objects, Unity will try to figure out the best object to select for you. If you click on an object that is part of a Prefab, the root of the Prefab is selected, because a Prefab root is treated as a selection base. You can make other objects be treated as selection base too. You need to create a script class with the SelectionBase attribute, and then you need to add that script to the GameObject.