js根据起始日期加间隔天数计算出结束日期

  getNewDay(dateTemp, days) {
      dateTemp = dateTemp.split("-");
      //转换为MM-DD-YYYY格式
      var nDate = new Date(dateTemp[1] + "-" + dateTemp[2] + "-" + dateTemp[0]);
      var millSeconds = Math.abs(nDate) + days * 24 * 60 * 60 * 1000;
      var rDate = new Date(millSeconds);
      var year = rDate.getFullYear();
      var month = rDate.getMonth() + 1;
      if (month < 10) month = "0" + month;
      var date = rDate.getDate();
      if (date < 10) date = "0" + date;
      return year + "-" + month + "-" + date;
    },

const end_time = this.getNewDay(options.time, options.day)

// options.time    起始日期
// options.day     间隔天数