Collegare stringa a variabile in un funzione jquery

[Vindav]

http://api.jquery.com/data/

$( ".nomeclasse" ).each(function(){
    $(this).data("autocomplete")._renderItem= function( ul, item ) { 
            return $( "<li></li>" ) 
                .data( "item.autocomplete", item ) 
                .append( "<a>[<strong>" + item.label + "</strong>] " + item.actor + "</a>" ) 
                .appendTo( ul ); 
            };
    });