60秒倒计时

btnText() {
      const time = setTimeout(() => {
        if (this.second === 0) {
          this.second = 60;//初始化60秒
          this.sended = false;//控制样式变化
          clearTimeout(time);
          this.text = '获取验证码';
        } else {
          this.btnText();
          this.second -= 1;
          this.text = `${this.second}s重新获取`;
        }
      }, 1000);
    }