组件在 Component 菜单中的顺序（顺序越低，位置越高）。
Note: The order only affects the component item itself and doesn't influence any submenus.
Scripts are first sorted by their namespace. Scripts without a namespace are positioned after those with a namespace.
By default, menu items are assigned a position value of 20. The 'componentOrder' value is then added to this default position to determine the final placement of the item. The order is not limited and can be a negative value.
If your item has a priority of 11 or higher than the previous item, Unity will automatically insert a separator before your item in the menu.
The following example shows how MyScript2 can be brought above MyScript by using a componentOrder of -1:
using UnityEngine;
[AddComponentMenu("My Scripts/My Script 1")] public class MyScript1 : MonoBehaviour { }
[AddComponentMenu("My Scripts/My Script 2", -1)] public class MyScript2 : MonoBehaviour { }