SP.FieldComputed.enableLookup property (sp.js)
Gets or sets a value that specifies whether a lookup field can reference the field.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.FieldComputed.get_enableLookup ()
var value = SP.FieldComputed.set_enableLookup ()
Return value
Type: Boolean