HarmonyOS Image加载base64失败

我想请问下Image组件加载Base64的问题，我使用 Image('data:image/[png|jpeg|bmp|webp];base64,[base64 data])这种方式加载图片失败，提示我failed to create image loader,image source type not supported ，但是我将 base64 通过以下方法保存，却能在本地文件看到图片，不知道是否格式配置或者base64需要经过处理才能显示

export async function writeFile(data: string): Promise<string> {

  let uri = ''
  try {
    let filePath = filesDir + "/1.";
    uri = fileUri.getUriFromPath(filePath);
    let file = fileIo.openSync(filePath, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
    console.info("file fd: " + file.fd);
    const reg = new RegExp("data:image/\\w+;base64,")
    const base64 = data.replace(reg, "");
    console.log("base64flag", base64)
    const dataBuffer = buffer.from(base64, 'base64')
    let writeLen = fileIo.writeSync(file.fd, dataBuffer.buffer);
    hilog.info(0xA0c0d0, 'uri', uri)
    fileIo.closeSync(file);
  }