HarmonyOS 一个ModelA，在它的ets/utils/目录下Util.ets文件，要在它的index.ets文件里面怎么写，才能让其他model能够引用到这个类？

做如下修改使用即可：

async getIsShowFeedBack() {
  let bPreferencesUtil = new BPreferencesUtil()
  this.isHideFeedBack = await bPreferencesUtil.getValue(getContext(this), 'key_isHideFeedBack') as boolean
}
async saveIsHideFeedBack() {
  let bPreferencesUtil = new BPreferencesUtil()
  await bPreferencesUtil.saveBoolean(getContext(this), 'key_isHideFeedBack', this.isHideFeedBack)
}