HarmonyOS 子组件和父组件数据同步问题

可以参考此demo：

class FormData {
  age: string = "18"
  name: string = ""
  gender: string = ""
}

@Entry
@Component
struct Test {
  @State form: FormData = new FormData()
  build() {
    Column() {
      Text(this.form.age)
      childComponent({ value: $form })
    }
  }
}

@Component
struct childComponent {
  @Link value: FormData
  build() {
    TextInput({ text: this.value.age, placeholder: "年龄" }).onChange((value: string) => {
      this.value.age = value
    })
  }
}