code: function() {
                  this.status = "stoped";
                  this.setValue(this.finishValue);
                  this.rollbacking = false;
                  /**
               * @event stop
               * @for kity.Timeline
               * @description 停止时间，在时间线停止时触发
               */
                  this.fire("stop", new TimelineEvent(this, "stop"));
                  frame.releaseFrame(this.frame);
                  return this;
              }
docs: @method stop()
  @for kity.Timeline
  @description 停止当前时间线
  
  @grammar stop() => {this}