this.objdatas.forEach(item => { 
                        this.temp = setInterval(() => {
                            let time = new Date(item.createdDate).getTime()
                            item['countDown'] = this.countDownFun(time)
                            this.$forceUpdate()
                        }, 
 
1000)
                    })

countDownFun(time) {
            　　time--;
            　　let nowTime = new Date().getTime(); // 獲取當前時間
            　　if (time  >= nowTime) {
                    var secondTime = 0 //秒
                    var minuteTime = 0; // 分
                    var hourTime = 0; // 小時
                    var
 
 today = 0 //天
                    // 全部剩餘多少秒
                    var seconds = Math.ceil((time - nowTime) / 1000) 
                    
                    hourTime = Math.floor(seconds / 3600) 
                    //天數
                    today = Math.floor(hourTime / 24)
                    //小時
                    hourTime = Math.floor(hourTime % 24
 
) < 10 ? '0' + Math.floor(hourTime % 24) : Math.floor(hourTime % 24)
                    // 分
                    minuteTime = Math.floor(seconds / 60 % 60) < 10 ? '0' + Math.floor(seconds / 60 % 60) : Math.floor(seconds / 60 % 60)
                    //秒
                    secondTime = Math.floor(seconds % 60) < 10 ? '0' + Math.floor(seconds % 60) : Math.floor(seconds % 60)
            
                    console.log('剩餘'+today+'天'+ hourTime+'小時'+minuteTime+'分鐘'+secondTime+'秒')
                    return '剩餘'+today+'天'+ hourTime+'小時'+minuteTime+'分鐘'+secondTime+'秒'
            　　} else {
            　　　　    return "00:00:00:00";
            　　}
            }

destroyed() {
            //切記頁面銷燬需要銷燬
            clearInterval(this.temp);
        }