const node = this.scene.createElement(xrFrameSystem.XRMesh, {
            castShadow: true,
            position: "0 0 2",
            "anim-keyframe": "anim",
            "anim-autoplay": "clip:cube,speed:2",
            geometry:"cube",
            uniforms: "u_baseColorFactor:0.8 0.4 0.4 1",
            scale: "0.1 0.1 0.1",
            animStop: this.nbnb,
            id: `ids${fromWhat}`
          });
          this.shadowRoot.addChild(node)

目前使用js动态创建xr组件动画无法自动播放，是哪里写错了吗，同样的属性在wxml上是能自动播放的。