HarmonyOS中使用ArrayBuffer 构造PixelMap 数据报错问题？

let uInt8Arr = new Uint8Array(8) 
uInt8Arr[0] = 161; 
uInt8Arr[1] = 153; 
uInt8Arr[2] = 151; 
uInt8Arr[3] = 255; 
uInt8Arr[4] = 160; 
uInt8Arr[5] = 152; 
uInt8Arr[6] = 150; 
uInt8Arr[7] = 255; 
let retBuffer = uInt8Arr.buffer; 
const retImgSource : image.ImageSource = image.createImageSource(retBuffer); 
// 创建pixelMap并进行简单的旋转和缩放 
retImgSource.createPixelMap({desiredPixelFormat : image.PixelMapFormat.RGBA_8888}).then((pixelMap : image.PixelMap) => { 
  console.log("Succeeded in creating PixelMap") 
}).catch((err : BusinessError) => { 
  console.error("Failed to create PixelMap",err) 
});