HarmonyOS 登录信息如何本地持久化，下次运行或者debug的时候还在

存储和取出首选项可参考demo：

import dataPreferences from '@ohos.data.preferences';

@Entry
@Component
struct Index {
  preferences: dataPreferences.Preferences | null = null;

  async writeModel<T>(key: string, value?: T) {
    if (this.preferences == null) {
      await this.getPreferences()
    }
    try {
      this.preferences?.putSync(key, JSON.stringify(value))
    } catch (e) {
      console.error('my_preference', 'Failed to write value, cause:' + e)
    }
    await this.preferences?.flush()
  }

  async getPreferences() {
    try {
      // let dataPreferences;
      this.preferences = await dataPreferences.getPreferences(getContext(), 'my_preference')
    } catch (e) {
      console.info('my_preference', 'Failed to get preferences, cause:' + JSON.stringify(e))
    }
  }

  async getKey(value: string) {
    if (this.preferences == null) {
      await this.getPreferences()
    }
    try {
      console.log('获取到的值+++++++++++：' + this.preferences?.getSync(value, 'string') + '')

    } catch (e) {
      console.error('my_preference', 'Failed to write value, cause:' + e)
    }
  }

  aboutToAppear(): void {
    this.getKey("name")

  }

  build() {
    Button('首选项存储').width(100).height(100)
      .onClick(() => {
        this.writeModel("name", "tom")
      })
  }
}

或者参考如下链接：https://developer.huawei.com/consumer/cn/codelabsPortal/carddetails/tutorials_NEXT-Preferences