lib/Request.js
function (count) {
    var delayMs = count * config.requestTimeout;

    if (this.counted) {
      if (this.getRequestCount && this.saveRequestCount)
        return this.saveRequestCount(count)
          .delay(delayMs)
          .then(this.getRequestCount)
          .then(decrement)
          .then(this.saveRequestCount);
    }

    return Promise.resolve();
  }
function (count) {
    var delayMs = count * config.requestTimeout;

    if (this.counted) {
      if (this.getRequestCount && this.saveRequestCount)
        return this.saveRequestCount(count)
          .delay(delayMs)
          .then(this.getRequestCount)
          .then(decrement)
          .then(this.saveRequestCount);
    }

    return Promise.resolve();
  }
请求后的操作
@param count