uni-app 验证码倒计时

getCurrentDown: function() {

    var interval = setInterval(() => {

        this.BtnText = this.second + 's 重新获取';

        this.second--;  //在data中定义second倒计时的时间

        if (this.second == 0) {

            clearInterval(interval);

            this.second = 60;

            this.BtnText = '获取验证码';

        }

    }, 1000);

}