three.js根据模型动画帧数切割动画

注意在帧数切割时，某段动画帧数是开区间，若0-15 则在切割时最好是到0-16

  generateFBX(v, maxTime, startTime) {
      var loader = new FBXLoader()
      loader.load('FBX/tt1.FBX', (mesh) => {
        mesh.scale.set(20, 20, 20)
        mesh.position.set(0, 300, 0)
        this.mixer = new THREE.AnimationMixer(mesh)
        
        var modelaction = mesh.animations[0]
        this.action = this.mixer.clipAction(modelaction)
        if (this.actionList.length == 0) {
          this.actionList.actionA = this.mixer.clipAction(
            THREE.AnimationUtils.subclip(modelaction, 'A', 0, 16)
          )
          this.actionList.actionA.repetitions = 1
          this.actionList.actionA.clampWhenFinished = true
          this.actionList.actionB = this.mixer.clipAction(
            THREE.AnimationUtils.subclip(modelaction, 'B', 15, 31)
          )
          this.actionList.actionB.repetitions = 1
          this.actionList.actionB.clampWhenFinished = true
        }

        //   默认1，0 暂停，负值 倒着播放
        this.action.timeScale = v

        // 设置开始播放的时间，从0开始
        this.action.time = startTime
        // this.action.play()
        
        // console.log('1', this.action)
        // console.log('2', this.actionList.actionA)

        this.scene.add(mesh)
      })
    },

需要哪段动画播放直接调用this.actionList.actionXX.play()
暂停this.actionList.actionXX.pauesd=true