想知道一段 clounm的高度

@Entry  
@Component  
struct ColumnTest {  
  @State @Watch('onCheange') cWidth: number = 200;  
  @State cHeight: number = 200;  
  
  onCheange (){  
    if(this.cWidth >= 300){  
      console.log("过宽！")  
    }  
  }  
  
  
  build() {  
    Column() {  
      Column() {  
        Row() {  
          Text('isidjaslkjadskjdalksdjkajdksjdakd')  
        }  
  
        Button('加宽')  
          .type(ButtonType.Capsule)  
          .onClick(() => {  
            this.cWidth += 100;  
          })  
        Button('加高')  
          .type(ButtonType.Capsule)  
          .onClick(() => {  
            this.cHeight += 100;  
          })  
        Button('show')  
          .type(ButtonType.Capsule)  
          .onClick(() => {  
            console.log("当前高度：" + this.cHeight + "当前高度：" + this.cHeight)  
          })  
      }  
      .backgroundColor(Color.Blue)  
      .id('111')  
      .width(this.cWidth)  
      .height(this.cHeight)  
  
    }  
    .width('100%')  
    .height('100%')  
  }  
}