HarmonyOS 背景图片如何填充满组件

Row() {  
  Text('立即购买')  
    .textAlign(TextAlign.Center)  
    .backgroundImage($r('app.media.btn_buy'))  
    .fontColor(Color.White)  
    .fontSize(16)  
    .layoutWeight(1)  
    .height(46)  
    .margin({ top: 30 })  
}  
.width('100%')  
.padding({ left: 14, right: 14 })  
.justifyContent(FlexAlign.Center)  
.alignItems(VerticalAlign.Center)
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