HarmonyOS 背景半透明渐变怎么设置

可以通过linearGradient设置带透明度渐变，透明度在颜色内设置。

参考代码：

@Entry
@Component
struct Page {
  build() {
    Column() {
      Text('测试')
    }
    .height('100%')
    .width('100%')
    .linearGradient(
      {
        angle: 180,
        colors: [['rgba(220,20,60,0.5)', 0.1], ["rgba(0,0,255,0.5)", 0.6],  ["rgba(0,255,0,0.5)", 1]]
      })
  }
}