SP.NavigationNodeCreationInformation.isExternal property (sp.js)
Gets or sets a value that specifies whether the navigation node URL potentially corresponds to pages outside of the site collection.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.NavigationNodeCreationInformation.get_isExternal ()
var value = SP.NavigationNodeCreationInformation.set_isExternal ()
Return value
Type: Boolean