SP.Publishing.Navigation.NavigationTermSetItem.isReadOnly property (sp.publishing)
Gets a Boolean value that indicates whether the object is in read-only mode or editable mode.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.Publishing.Navigation.NavigationTermSetItem.get_isReadOnly()
Return value
If the object is in the read-only? mode, true; otherwise, false.