验证码倒计时

    data() {
        return {
            isCountdown: false, //倒计时状态
            time: '', //倒计时 
            currentTime: 61, // 当前倒计时
        }
    },
        getCode() {
            let that = this;
                let clock = setInterval(function(){
                that.currentTime--;
                that.time = that.currentTime + '秒'
                if (that.currentTime <= 0) {
                    clearInterval(clock)
                    that.time = '',
                    that.currentTime = 61,
                    that.isCountdown = false
                }
            }, 1000); //一秒执行一次
        },