HarmonyOS dataPreferences保存时调用

static  async getPreferences(preferenceName: string = defaultPreferenceName) { 
  return await dataPreferences.getPreferences(context, preferenceName) 
}
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this.getPreferences(preferenceName) 
 
static async put(key: string, value: ValueType, preferenceName: string = defaultPreferenceName) { 
  // 获取实例 
  let preferences = await this.getPreferences(preferenceName) 
  await preferences.put(key, value) 
  //Tips Point ---此处一定要flush，要不然不能永久序列化到本地 
  await preferences.flush() 
}
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Using "this" inside stand-alone functions is not supported (arkts-no-standalone-this) <ArkTSCheck> 
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