How to use the websocket.ws function in websocket

function jsonRpc(url, fct_name, params, settings) {
    settings = settings || {};
    var fallback = _jsonRpc.bind(this, url, fct_name, params, settings);
    // check for relative url
    if (websocket.ws && websocket.ws.enabled()) {
      return genericJsonRpc(fct_name, params, settings, function(rpc) {
        return websocket.ws.send(_.extend({}, settings, {
          path: url,
          rpc: rpc
        }));
      });
    }

    return fallback();
  }

setup: function() {
      this._super.apply(this, arguments);
      if (websocket.ws) websocket.ws.destroy();
      var uri = this.origin.replace('http://', 'ws://').replace('https://', 'wss://');
      if (odoo.debug) {
        uri += '?debug=' + $.deparam($.param.querystring()).debug;
      }
      websocket.ws = new WebSocket(uri);
    }
  });

return genericJsonRpc(fct_name, params, settings, function(rpc) {
        return websocket.ws.send(_.extend({}, settings, {
          path: url,
          rpc: rpc
        }));
      });
    }