***js**

model.call('action_wizardd',[context]).then(function(result){ 

                   web_client.do_action(result, {
                    });
                    });

***********python Script****

def action_wizardd(self,cr,uid,cc,context=None):
        view_ids = self.pool.get('ir.model.data').get_object_reference(cr, uid,                                                                                       'draft_quote_wf',                                                                       'sale_expire_date_view')        view_id = view_ids[1]   

        cc.update({'active_id':cc['params']['id']})        # context = {'active_id': context['params']}
        return {

            'name': _("Extend Expire Date"), 

           'view_type': 'form',

            'view_mode': 'form',

            'view_id': view_id,

            'views': [(False, 'form', False)], 

           'res_model': 'sale.extend.expire.date', 

           'type': 'ir.actions.act_window', 

           'target': 'new', 

           'context': cc        }

Hope This will make you understand the use of do_action()