HarmonyOS 如何动态绑定元素的position属性

将position属性的值定义成变量，通过动态改变变量的值来改变position。

参考样例如下：

@Entry
@Component
struct PositionExample {
  @State posix1 : number = 0;
  @State posiy1 : number = 0;
  @State posix2 : string = '0%';
  @State posiy2 : string = '0%';
  build() {
    Column({ space: 20 }) {
      Text('position').fontSize(12).fontColor(0xCCCCCC).width('90%')
      Column() {
        Text('1').size({ width: '30%', height: '50' }).backgroundColor(0xdeb887).border({ width: 1 }).fontSize(16)
          .textAlign(TextAlign.Center)
        Text('2 position(数字)')
          .size({ width: '60%', height: '30' })
          .backgroundColor(0xbbb2cb)
          .border({ width: 1 })
          .fontSize(16)
          .align(Alignment.Start)
          .position({ x: this.posix1, y: this.posiy1 })
        Text('3 position(百分比)')
          .size({ width: '50%', height: '50' })
          .backgroundColor(0xbbb2cb)
          .border({ width: 1 })
          .fontSize(16)
          .position({ x: this.posix2, y: this.posiy2})
      }.width('90%').height(100).border({ width: 1, style: BorderStyle.Dashed })
      Button('改变posion的值')
        .onClick(() => {
          this.posix1 = 30;
          this.posiy1 = 50;
          this.posix2 = '50%';
          this.posiy2 = '50%';
        })
    }
    .width('100%').margin({ top: 25 })
  }
}