现成api
EditorApplication.applicationPath
获取结果:C:/Program Files/Unity/Hub/Editor/2021.3.10f1/Editor/Unity.exe
EditorApplication.applicationContentsPath
获取结果:C:/Program Files/Unity/Hub/Editor/2021.3.10f1/Editor/Data
获取结果:C:/Program Files/Unity/Hub/Editor/2021.3.10f1/Editor/Unity.exe
获取结果:C:/Program Files/Unity/Hub/Editor/2021.3.10f1/Editor/Data