getDurationTime() {
    let duration = Math.pow(10, 9);
    if (!this.list.length) return duration;

    forEach(this.list, ani => {
      if (ani.to && ani.to.type === 'out') {
        duration = ani.delay + ani.time;
      }
    });

    return duration;
  }
Get the sum of the duration of all animations
@public