HarmonyOS ArrayList 遇到问题？

Error message:The forEach method cannot be bound, 调用的对象是ArrayList

export class LUBCUAAgreementInfo {

 id?: number

 type?: string

}

export class LUBCUAUnifyAuthSceneInfoResult {

 id?: number

 sceneCode?: string

 agreementInfoDTOS?: ArrayList<LUBCUAAgreementInfo>

}

调用代码

@Component

export struct LUBCUALoginView {

 @Prop agreementData?: LUBCUAUnifyAuthSceneInfoResult

 aboutToAppear(): void {

   this.agreementData?.agreementInfoDTOS?.forEach((value: LUBCUAAgreementInfo, index: number) => {

   })

 }

}