code: function ONSProducer(id, accessKey, secretKey, options) {
      Base.call(this, id, accessKey, secretKey, options);
      this.order = !!this.options.order;
  }
docs: ONSProducerClient
  @param {String} producerId the producer id
  @param {String} accessKey the access key
  @param {String} secretKey the secret key
  @param {Object} [options] the options
  @param {String} [options.namesrvAddr] the ONS server address
  @param {Boolean} [options.order] whether it will be `OrderProducer`
  @constructor