code: function() {
                  if (this.repeatOption) {
                      this.time = 0;
                      if (this.rollback) {
                          if (this.rollbacking) {
                              this.decreaseRepeat();
                              this.rollbacking = false;
                          } else {
                              this.rollbacking = true;
                              /**
                           * @event rollback
                           * @for kity.Timeline
                           * @description 回滚事件，在时间线回滚播放开始的时候触发
                           */
                              this.fire("rollback", new TimelineEvent(this, "rollback"));
                          }
                      } else {
                          this.decreaseRepeat();
                      }
                      if (!this.repeatOption) {
                          this.finish();
                      } else {
                          /**
                       * @event repeat
                       * @for kity.Timeline
                       * @description 循环事件，在时间线循环播放开始的时候触发
                       */
                          this.fire("repeat", new TimelineEvent(this, "repeat"));
                      }
                  } else {
                      this.finish();
                  }
              }
docs: @private
  
  播放结束之后的处理