HarmonyOS dialog调用open方法，不显示

export class GlobalContext {  
  private constructor() {  
  }  
  
  private static instance: GlobalContext;  
  private _objects = new Map<string, Object>();  
  
  public static getContext(): GlobalContext {  
    if (!GlobalContext.instance) {  
      GlobalContext.instance = new GlobalContext();  
    }  
    return GlobalContext.instance;  
  }  
  
  getObject(value: string): Object | undefined {  
    return this._objects.get(value);  
  }  
  
  setObject(key: string, objectClass: Object): void {  
    this._objects.set(key, objectClass);  
  }  
}
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aboutToAppear(): void {  
  GlobalContext.getContext().setObject('UIContext', this)  
}
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let customDialogId: number = 0  
@Builder  
export function customDialogBuilder(content: String, str: string) {  
  Column() {  
    Text(`Tip: ${content} ${str} `).fontSize(20).height("30%")  
    Text('失败原因：失败原因失败原因失败原因失败原因失败原因失败原因失败原因!').fontSize(16).height("30%")  
    Row() {  
      Button("确认").onClick(() => {  
        promptAction.closeCustomDialog(customDialogId)  
      })  
      Blank().width(50)  
      Button("取消").onClick(() => {  
        promptAction.closeCustomDialog(customDialogId)  
      })  
    }  
    .margin({top: 30})  
  }.height(200).padding(5)  
}  
export function query(){  
  const that = GlobalContext.getContext().getObject('UIContext') as UIContext;  
  if (that) {  
    promptAction.openCustomDialog({  
      builder: customDialogBuilder.bind(that, "网络请求失败！", '111111')  
    }).then((dialogId: number) => {  
      customDialogId = dialogId;  
    })  
  }  
}
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