JS library to get label?

Given that I have a URI, is there a JS library so that I can make a call
like

getLabels( uri, lang ) or getPropertyValues( uri, rdf:label, lang )

or whatever call to get the label(s) in the given / the available
languages, assuming the the URI resolves and returns an RDF description
containing the rdf:label?

Cheers,
Denny