let countDown = function(id){let now = new Date();let dom = document.getElementById(id)let add0 = function (num) { return num >= 10 ? num : '0' + num}let that = thisvar hour = this.add0(23 - now.getHours());//時var minute = this.add0(59 - now.getMinutes());//分var second = this.add0(59 - now.getSeconds());//秒dom.innerHTML = hour + ':' + minute + ':' + secondfunction render () {second = that.add0(second -1);if (second <= 0 ){second = 59;minute = that.add0(minute -1);if(minute < 0){minute = 59;hour = that.add0( hour -1);if(hour < 0){hour = 23;}}}dom.innerHTML = '<span>' + hour + '</span>:<span>' + minute + '</span>:<span>' + second + '</span>'}setInterval(render,1000) }

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