ArkTS简单类型变量双向数据绑定

@Entry 
@Component 
struct Index { 
  @State text: string = 'false' 
  build() { 
    Column() { 
      pageIndex({buttonText: $text}) 
      Text(this.text).margin({left:145,top:20}).fontSize(30) 
    } 
  } 
} 
  
@Component 
struct pageIndex { 
  @Link buttonText: string 
  build() { 
    Column() { 
      Button('按钮') 
        .margin({left:130,top:30}) 
        .width(150) 
        .onClick(() => { 
        this.buttonText = '123' 
      }) 
    } 
  } 
}