HarmonyOS stateStyles多态样式

可以通过焦点事件来实现获焦时输入框边框颜色的动态修改，示例如下：

@Entry
@Component
struct Index {

  @State borColor:Color = Color.White
  @State borColor1:Color = Color.White
  build() {
    Row() {
      Column() {
        TextInput({placeholder:'qwe'})
          .backgroundColor(Color.White)
          .enableKeyboardOnFocus(true)
          .borderStyle(BorderStyle.Solid)
          .borderWidth(3)
          .borderColor(this.borColor)
          .focusable(true)

          .onFocus(()=>{
            this.borColor = Color.Green
          })
          .onBlur(() => {
            this.borColor = Color.White
          })
        TextInput({placeholder:'qwe'})
          .backgroundColor(Color.White)
          .enableKeyboardOnFocus(true)
          .borderStyle(BorderStyle.Solid)
          .borderWidth(3)
          .borderColor(this.borColor1)
          .focusable(true)

          .onFocus(()=>{
            this.borColor1 = Color.Red
          })
          .onBlur(() => {
            this.borColor1 = Color.White
          })
      }
      .width('100%')
    }
    .height('100%')
  }}
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