code: function _updateSpring() {
          var springValue = this._scroll.scrollForceCount ? undefined : this._scroll.springPosition;
          if (this._scroll.springValue !== springValue) {
              this._scroll.springValue = springValue;
              if (springValue === undefined) {
                  if (this._scroll.springForceId !== undefined) {
                      this._scroll.pe.detach(this._scroll.springForceId);
                      this._scroll.springForceId = undefined;
                      //_log.call(this, 'disabled spring');
                  }
              }
              else {
                  if (this._scroll.springForceId === undefined) {
                      this._scroll.springForceId = this._scroll.pe.attach(this._scroll.springForce, this._scroll.particle);
                  }
                  this._scroll.springEndState.set1D(springValue);
                  this._scroll.pe.wake();
                  //_log.call(this, 'setting spring to: ', springValue, ' (', this._scroll.springSource, ')');
              }
          }
      }
docs: Helper function for logging debug statements to the console.
   /*function _log(args) {
  if (!this.options.debug) {
  return;
  }
  var message = this._debug.commitCount + ': ';
  for (var i = 0, j = arguments.length; i < j; i++) {
  var arg = arguments[i];
  if ((arg instanceof Object) || (arg instanceof Array)) {
  message += JSON.stringify(arg);
  }
  else {
  message += arg;
  }
  }
  console.log(message);
  } 
  Sets the value for the spring, or set to `undefined` to disable the spring