HarmonyOS关于异步Promise的使用问题

public constructor(pixelMap: PixelMap) { 
  if (data != undefined) { 
    data.getImageInfo().then((imageInfo: image.ImageInfo) => { 
      let width = imageInfo.size.width; 
      let height = imageInfo.size.height; 
      const readBuffer = new ArrayBuffer(width * height * 4); 
      data.readPixelsToBuffer(readBuffer).then(() => { 
        // 已完成写入 
        nativeModule.create(readBuffer, height, width, BDFaceImageType.BDFACE_IMAGE_TYPE_BGRA.valueOf(), 0, 0, this); 
      }).catch((error : BusinessError) => { 
        console.error('Failed to read the image data in the area.'); 
      }) 
    }).catch((error : BusinessError) => { 
      hilog.error(0x0000, 'BDFaceImageInstance', '%{public}s', 'Failed to read the image info = ' + error.message); 
    }); 
  } 
}，

let bdFaceImageInstance: BDFaceImageInstance = new BDFaceImageInstance(this.liveVisPmp!); 
let faceInfos: FaceInfo[] | null; 
if (!isTrack) { 
  faceInfos = this.mFaceDetect.detect(DetectType.DETECT_VIS, bdFaceImageInstance); 
} else { 
  faceInfos = this.mFaceDetect.track(DetectType.DETECT_VIS, bdFaceImageInstance); 
}，