SP.NavigationNodeCreationInformation.previousNode property (sp.js)
Gets or sets a value that specifies the navigation node after which the new navigation node will appear in the navigation node collection.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.NavigationNodeCreationInformation.get_previousNode ()
var value = SP.NavigationNodeCreationInformation.set_previousNode ()
Return value
Type: SP.NavigationNode