xxxxx.xxxxx.campaign.update
        ===================================
        更新一个推广计划，可以设置推广计划名字、是否平滑消耗，只有在设置了日限额后平滑消耗才会产生作用。

def update(self, campaign_id, title, is_smooth, online_status, nick=None):
        '''xxxxx.xxxxx.campaign.update
        ===================================
        更新一个推广计划，可以设置推广计划名字、是否平滑消耗，只有在设置了日限额后平滑消耗才会产生作用。'''
        request = TOPRequest('xxxxx.xxxxx.campaign.update')
        request['campaign_id'] = campaign_id
        request['title'] = title
        request['is_smooth'] = is_smooth
        request['online_status'] = online_status
        if nick!=None: request['nick'] = nick
        self.create(self.execute(request), fields=['success','result','success','result_code','result_message'], models={'result':Campaign})
        return self.result