HarmonyOS json数据如何转成map

for (let [key, value] of Object.entries(jsonData)) {   this.mMap.set(key, value);  }

public loadFile() : void { 
  let buf = new ArrayBuffer(this.MAX_SDK_DATA_SIZE); 
  let file = fs.openSync(this.context.filesDir + '/sdkdata.dat', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
  let objIn: fs.Stream | null = null; 
  try { 
  let stream = fs.createStreamSync(this.context.filesDir + '/sdkdata.dat', "r+"); 
  let readOption: ReadOptions = { 
    offset: 5, 
    length: 5 
  }; 
  let num = stream.readSync(buf, readOption); 
  let buf1 = buffer.from(buf, 0, num); 
  const jsonData = buf1.toJSON(); 
  // 将解析后的数据存储到 Map 中 
  for (let [key, value] of Object.entries(jsonData)) { 
  this.mMap.set(key, value); 
} 
} catch (error) { 
  console.error("SdkData load failed", error); 
} finally { 
}