获取系统时间

timeFormate(timeStamp) {
                let year = new Date(timeStamp).getFullYear();
                let month = new Date(timeStamp).getMonth() + 1 < 10 ? "0" + (new Date(timeStamp).getMonth() + 1) : new Date(timeStamp).getMonth() + 1;
                let date = new Date(timeStamp).getDate() < 10 ? "0" + new Date(timeStamp).getDate() : new Date(timeStamp).getDate();
                let hh = new Date(timeStamp).getHours() < 10 ? +new Date(timeStamp).getHours() : new Date(timeStamp).getHours();
                let mm = new Date(timeStamp).getMinutes() < 10 ? "0" + new Date(timeStamp).getMinutes() : new Date(timeStamp).getMinutes();
                let dd = new Date(timeStamp).getDay() < 10 ? "0" + new Date(timeStamp).getDay() : new Date(timeStamp).getDay();
                if (dd == 1) {
                    this.nowDay = "星期一"
                } else if (dd == 2) {
                    this.nowDay = "星期二"
                } else if (dd == 3) {
                    this.nowDay = "星期三"
                } else if (dd == 4) {
                    this.nowDay = "星期四"
                } else if (dd == 5) {
                    this.nowDay = "星期五"
                } else if (dd == 6) {
                    this.nowDay = "星期六"
                } else {
                    this.nowDay = "星期日"
                }
                // this.nowDay = "星期" + dd
                this.nowDate = year + "年" + month + "月" + date + "日"
                this.nowTime = +" " + hh + ":" + mm;
            },

如果需要实时更新，则添加一个定时器

 this.timeFormate(new Date());
 setInterval(this.nowTimes, 30 * 1000); //这里是30秒刷新一次