HarmonyOS 嵌套自定义类型引用的undefined判断

@State info初始化不对相当于一个空对象，改为@State info: TestA = new TestA()即可，示例参考：

export interface ProDetailBaseInfo {
  customer_company_address: ProCustomerCompanyAddres;
}

export interface ProCustomerCompanyAddres {
  company_address: string;
  calculate_commute_time: number;
  transport_type_name: string
}

export class TestA {
  one: string = "";
  two: string = "";
  three: TestB = new TestB()
}

export class TestB {
  aaa: string = "";
  bbb: TextC = new TextC();
  ccc: string = "1111";
}

export class TextC {
  ddd: string = "";
  fff: string = "";
  eee: string = "";
}

@Entry
@Component
struct Index8 {
  @State message: string = 'Hello World';
  @State detail: ProDetailBaseInfo =
    { customer_company_address: { company_address: '', calculate_commute_time: 0, transport_type_name: '' } }
  @State transportString: string = ''
  @State info: TestA = new TestA()

  aboutToAppear(): void {
    let seconds: number = 0
    if (this.detail) {
      let ccaddress: ProCustomerCompanyAddres = this.detail.customer_company_address
      if (ccaddress) {
        seconds = ccaddress.calculate_commute_time
        this.transportString = ccaddress.transport_type_name + '约' + seconds.toString()
      }
    }
  }

  build() {
    RelativeContainer() {
      Text(this.info.three.ccc)
        .id('Index8HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }
}