鸿蒙开发-按钮倒计时

@Entry
@Component
struct CounterCase {

  @State count: number = 5
  timer: number = -1
  flagTimer: boolean = false
  build() {
    Row() {
      Column() {
        Button(this.count < 5 ? `还剩下${this.count}秒`:'发送验证码')
          .onClick(() => {
            if (this.flagTimer) {
              return
            }
            this.flagTimer = true
            this.timer = setInterval(() => {
              if (this.count == 0) {
                clearInterval(this.timer)
                this.count = 5
                this.flagTimer = false
                return;
              }
              this.count--
            }, 1000)
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}