通用属性width是否支持设置变量

@Entry 
@Component 
struct Page1 { 
  @State message: string = 'Hello'; 
  @State widNum: number = 300; 
 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .width(this.widNum) 
          .backgroundColor(Color.Blue) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}