showtime(time) {
   let date =
    typeof time === "number"
     "").replace(/-/g, "/"));
   let diff = (new Date().getTime() - date.getTime()) / 1000;
   let dayDiff = Math.floor(diff / 86400);

   let isValidDate =
    Object.prototype.toString.call(date) === "[object Date]" &&
    !isNaN(date.getTime());

   if (!isValidDate) {
    window.console.error("不是有效日期格式");
   }
   const formatDate = function(date) {
    let today = new Date(date);
    let year = today.getFullYear();
    let month = ("0" + (today.getMonth() + 1)).slice(-2);
    let day = ("0" + today.getDate()).slice(-2);
    let hour = today.getHours();
    let minute = today.getMinutes();
    let second = today.getSeconds();
    return `${year}-${month}-${day} ${hour}:${minute}:${second}`;
   };

   if (isNaN(dayDiff) || dayDiff < 0 || dayDiff >= 31) {
    return formatDate(date);
   }
   return (
    (dayDiff === 0 &&
     ((diff < 60 && "刚刚") ||
      (diff < 120 && "1分钟前") ||
      (diff < 3600 && Math.floor(diff / 60) + "分钟前") ||
      (diff < 7200 && "1小时前") ||
      (diff < 86400 && Math.floor(diff / 3600) + "小时前"))) ||
    (dayDiff === 1 && "昨天") ||
    (dayDiff < 7 && dayDiff + "天前") ||
    (dayDiff < 31 && Math.ceil(dayDiff / 7) + "周前")
   );
  },

  // 获取用户年龄
   this.userAge = this.toAge(timeStamp);
   console.log(this.userAge);

  // 根据返回的日期计算间隔
       toAge(timeStamp) {
        let birthDate = this.toDate(timeStamp).substr(0, 4);
        let newDate = new Date().getFullYear();
        return (newDate - parseInt(birthDate));
      }
      
      // 时间戳转日期
      toDate(number) {
        let n = number;
        let date = new Date(n);
        let Y = date.getFullYear() + '/';
        let M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '/';
        let D = date.getDate() < 10 ? '0' + date.getDate() : date.getDate();
        return (Y + M + D)
      }