HarmonyOS 如何设置渐变背景色？

@Entry  
@Component  
struct Index {  
  build() {  
    Column() {}  
    .width('100%')  
    .height('100%')  
    .linearGradient({  
      direction:GradientDirection.Bottom,  
       colors:[[0xff0000, 0.0], [0xffff00, 1]]  
    })  
  }  
}
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