活动秒杀倒计时

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https://www.jianshu.com/p/df43f1983eab

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// 秒杀倒计时

        _cutDown(t) {

            let _self = this

            let startTime = t.startTime // 开始时间时间戳

            let endTime = t.endTime     // 结束时间时间戳

            // 当前日期转换为1970-01-01后的时间戳

            let nowTime = format.time((new Date()).getTime(), 'YYYY-MM-DD HH:mm:ss')

            nowTime = new Date(nowTime.replace(/.{10}/, '1970-01-01')).getTime()

            let times = (endTime - nowTime) / 1000

            let timmer = setInterval(() => {

                if (times <= 0) {

                    _self.setData({ finish: true })

                    clearInterval(timmer)

                    timmer = null

                }

                times--

                let HH = Math.floor(times / 3600)

                let mm = Math.floor((times - HH * 3600) / 60)

                let ss = Math.floor((times - HH * 3600) % 60)

                _self.setData({

                    HH: format.twoDigit(HH),

                    mm: format.twoDigit(mm),

                    ss: format.twoDigit(ss)

                })

            }, 1000)

        },