how can I call a web service using JAVAscript in LCD

hi guys,

     I know it can call a WSDL in LCD, but I have not any WSDL web service , and I have a REST web service ,how can I call this REST web service in LCD? I checked some documents and found nothing...if it's possible that it can call a REST web service using JAVAScript code, I mean I can program some code to call this web service ?

thanks,

Jesse