HarmonyOS 如何进行数据持久化

class UserInfo {  
  isLogin?:boolean ;  
  loginType?:string;  
  
}  
let user:UserInfo = new UserInfo()  
user.isLogin = true  
PersistentStorage.persistProp('aProp',JSON.stringify(user))  
@Entry  
@Component  
struct Index {  
  @State message: string = 'Hello World';  
  @StorageLink('aProp') aProp: string = ''  
  
  build() {  
    Row() {  
      Column() {  
        Text(this.aProp)  
          .fontSize(50)  
          .fontWeight(FontWeight.Bold)  
          .onClick(() => {  
            let data:UserInfo = JSON.parse(this.aProp)  
            data.isLogin = !data.isLogin  
            AppStorage.setOrCreate('aProp',JSON.stringify(data));  
          })  
      }  
      .width('100%')  
    }  
    .height('100%')  
  }  
}