js日期封装，返回分钟前，天前，月前，年前

     //  时间封装
     dateTime(time){
          let oldDate = new Date(time)
          let newDate = new Date()
          var dayNum = "";
          let getTime = (newDate.getTime() - oldDate.getTime())/1000;

          if(getTime < 60*2){
              dayNum = "刚刚";
          }else if(getTime >= 60*2 && getTime < 60*60){
              dayNum = parseInt(getTime / 60) + "分钟前";
          }else if(getTime >= 3600 && getTime < 3600*24){
              dayNum = parseInt(getTime / 3600) + "小时前";
          }else if(getTime >= 3600 * 24 && getTime < 3600 * 24 * 30){
              dayNum = parseInt(getTime / 3600 / 24 ) + "天前";
          }else if(getTime >= 3600 * 24 * 30 && getTime < 3600 * 24 * 30 * 12){
              dayNum = parseInt(getTime / 3600 / 24 / 30 ) + "个月前";  
          }else if(time >= 3600 * 24 * 30 * 12){
              dayNum = parseInt(getTime / 3600 / 24 / 30 / 12 ) + "年前";  
          }

          function checkTime(time){
             if(time < 10){
                time = "0" + time
             }
             return time
          }

          let year   = oldDate.getFullYear();
          let month  = oldDate.getMonth()+1;
          let day    = oldDate.getDate();
          let hour   = oldDate.getHours(); 
          let minute = oldDate.getMinutes(); 
          let second = oldDate.getSeconds(); 
          return dayNum+" "+year+"-"+month+"-"+day+" "+checkTime(hour)+":"+checkTime(minute)+":"+checkTime(second);
      }