js 時間戳轉成正常時間

/* 獲取時間戳時間 */
    getTime(datas) {
      //時間戳爲10位需*1000，時間戳爲13位的話不需乘1000
      let date = new Date(datas * 1000);
      let Y = date.getFullYear() + "-";
      let M =
        (date.getMonth() + 1 < 10
          ? "0" + (date.getMonth() + 1)
          : date.getMonth() + 1) + "-";
      let D = date.getDate() + " ";
      let h = date.getHours() + ":";
      let m = date.getMinutes() + ":";
      let s = date.getSeconds();
      return Y + M + D + h + m + s;
    },

view() {
      this.$axios({
        method: "get",
        url: "/admin/receipt_bill/index",
        params: {
          page: this.page,
          pagesize: this.pagesize,
          search: this.search_all
        }
      })
        .then(res => {
          this.datas = res.data.data.data.data;
          this.datas.forEach(item => {
            item.create_time = this.getTime(item.create_time);
            item.pay_time = this.getTime(item.pay_time);
          });
          this.field = res.data.data.field;
          this.total = parseInt(res.data.data.data.total);
        })
        .catch(err => {
          this.$message(err);
        });
    },

** item.create_time = this.getTime(item.create_time);
item.pay_time = this.getTime(item.pay_time);**
調用方式