小白来求助，寻求帮助?

class OptionBean {
  Image: string = ''
  Value: number = 0
}

@Entry
@Component
struct Page41 {
  @State Keys: OptionBean[] = []
  @State aNumber: number = 0
  @State option: number = 0
  @State Mark: string = ''

  Show_ab(option: OptionBean) {
    if (this.Mark == '') {
      this.aNumber += option.Value
    }
  }

  build() {
    Column() {
      Grid() {
        ForEach(this.Keys, (option: OptionBean, index: number) => {
          GridItem() {
            Image(option.Image)
              .onClick(() => {
                this.Show_ab(option)
              })
          }
        })
      }
    }
    .width('100%')
    .height('100%')
  }
}