HarmonyOS 鸿蒙Next：如何将class的事件回调给界面

网页会调用JsToJavaOnCreate，如何将class里的isCreate通知到CameraPage里的isCreate，我添加@Link报错了。
@Component
@Entry
struct CameraPage {
  private controller: WebviewController = new webview.WebviewController()
  @State link: string = ‘https:’
  @State isCreate: boolean = false
  @State javaObj: javaClass = new javaClass();

  build() {
    Stack() {
      Web({ src: this.link, controller: this.controller })
        .mixedMode(MixedMode.All)
        .backgroundImage($r(‘app.media.background’))
        .width(“100%”)
        .height(“100%”)
        .javaScriptAccess(true)
        .domStorageAccess(true)
        .fileAccess(true)
        .imageAccess(true)
        .onlineImageAccess(true)
        .zoomAccess(true)
        .overviewModeAccess(true)
        .databaseAccess(true)
        .geolocationAccess(true)
        .multiWindowAccess(true)
        .mediaPlayGestureAccess(true)
        .blockNetwork(false)
        .pinchSmooth(true)
        .javaScriptProxy({
          object: this.javaObj,
          name: “android”,
          methodList: [‘JsToJavaOnCreate’],
          controller: this.controller
        })

    }
  }
}

class javaClass {
  isCreate: boolean = false

  constructor() {
  }

  JsToJavaOnCreate(): string {
    this.isCreate = true
    return ‘’;
  }
}