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loadImageWithUrl(url: string) { 
  // 使用request下载图片并在回调函数中保存图片到相册 
  http.createHttp().request(url, { method:http.RequestMethod.GET, connectTimeout:60000, readTimeout:60000 }, async (error: BusinessError, data: http.HttpResponse) => { 
    if (error) { 
      console.error(`http reqeust failed with. Code: ${error.code}, message: ${error.message}`); 
    } else { 
      if (ResponseCode.ResponseCode.OK === data.responseCode) { 
        let imageBuffer: ArrayBuffer = data.result as ArrayBuffer; 
        try { 
          // 获取相册路径 
          const context = getContext(this); 
          let helper = photoAccessHelper.getPhotoAccessHelper(context); 
          let uri = await helper.createAsset(photoAccessHelper.PhotoType.IMAGE, 'jpg') 
          let file = await fs.open(uri, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE) 
          // 写入文件 
          fs.writeSync(file.fd, imageBuffer); 
          // 关闭文件 
          fs.closeSync(file.fd); 
        } catch (error) { 
          console.error("error is "+ JSON.stringify(error)) 
        } 
      } else { 
        console.error("error occurred when image downloaded!") 
      } 
    } 
  }) 
}
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saveBase64Image(base64Str:string) { 
  //文件保存路径 
  let uri = ''; 
  try { 
    let PhotoSaveOptions = new picker.PhotoSaveOptions(); 
    //保存图片默认名称 
    PhotoSaveOptions.newFileNames = ['test.png']; 
    let photoPicker = new picker.PhotoViewPicker(); 
    //调起系统的图片保存功能 
    photoPicker.save(PhotoSaveOptions).then((PhotoSaveResult) => { 
      uri = PhotoSaveResult[0]; 
      //获取图片的base64字符串 
      let imageStr = base64Str.split(',')[1]; 
      //打开文件 
      let file = fs.openSync(uri, fs.OpenMode.READ_WRITE); 
      //base64字符串转成buffer 
      const decodeBuffer = buffer.from(imageStr, 'base64').buffer; 
      //写入文件 
      fs.writeSync(file.fd, decodeBuffer); 
      //关闭文件 
      fs.closeSync(file); 
    }).catch((err: Error) => { 
      console.error(err + ''); 
    }) } catch (e) { 
    console.error(e); 
  } 
}
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async savePixlMap(pixelMap:image.PixelMap): Promise<string>{ 
 
  let context = getContext(this) as common.UIAbilityContext; 
  let filesDir = context.filesDir; 
  let filePath = filesDir + `/${new Date().getTime()}.jpg` 
  fs.createRandomAccessFileSync(filePath, fs.OpenMode.CREATE); 
  let resUri = fileuri.getUriFromPath(filePath); 
  try { 
  const imagePackerApi: image.ImagePacker = image.createImagePacker(); 
  const packOpts: image.PackingOption = { format: "image/jpeg", quality: 100 }; 
  let imageBuffer: ArrayBuffer = new ArrayBuffer(1); 
  // 图片压缩或重新打包 
  imageBuffer = await imagePackerApi.packing(pixelMap, packOpts); 
  let file = fs.openSync(resUri, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
  fs.writeSync(file.fd, imageBuffer); 
  //关闭文件 
  fs.closeSync(file); 
 
} catch (err) { 
  console.error(`Invoke packingPixelMap2Jpg failed, err: ${JSON.stringify(err)}`); 
} 
return resUri 
}
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