一起学习，几个日期处理函数

日期处理

let date = {

    //小于10补零  
    addZero:function(num){
       return num > 9 ? num : "0"+num;
    }
    
    //格式化时间
    ,formatDate:function(date,separate){
        if(!typeof separate == 'string' && separate != undefined){
            throw new Error("separate "+separate+" is not string type");
        }
        var separate = separate || '-';
        return date.getFullYear() + separate
            + this.addZero(date.getMonth() + 1)+ separate
            + this.addZero(date.getDate())+" "
            + this.addZero(date.getHours())+":"
            + this.addZero(date.getMinutes())+":"
            + this.addZero(date.getSeconds());
    }
    
    //获取date
    ,getDate:function(dateStr){
        //日期格式yyyy-MM-dd
       	let regDate = /^((?:19|20)\d\d)-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])$/
        if(regDate.test(dateStr)){
            let dateArr = dateStr.split("-")
            return new Date(dateArr[0],dateArr[1],dateArr[2],0,0,0)
        }
        return new Date(dateStr);
     }
     
      //获取时间戳
      ,getTimeStamp:function(date){
          return date.getTime();
      }
      
      //计算时间差
      ,timeDiffer:function(beginDateStr,endDateStr){
          var startTime = new Date(beginDateStr);
          var endTime = new Date(endDateStr);
          var date= endTime.getTime() - startTime.getTime();
          var days = Math.round(date/(24*3600*1000));
          return days;
      }
      
      //计算时间差,当beginDateStr,endDateStr相同时，包含这天
      ,timeDifferInclude:function(beginDateStr,endDateStr){
          let days = this.timeDiffer(beginDateStr,endDateStr)+1;
          return days;
      }
      
      /**
       * set多少天前/后的date
       * date：可以是（时间戳，格式化时间YYYY-MM-dd HH:mm:ss字符串，Date对象）
       */
      ,setManyDays:function(date,manyDays){
          date = new Date(date)
          date.setDate(date.getDate() + manyDays);
          return date;
      }
      
      //获取指定年、月的天数
      ,getDays:function(year, month){
          return new Date(year,month,0).getDate();
      }
      
      //获取某年，某月的第一个天是周几
      ,getFirstDayIsWeek:function(y,m){
          return new Date(y,m-1,1).getDay();
      }
      
      //获取年月日
      ,getYMD:function(date){
          return {year:date.getFullYear(),month:date.getMonth()+1,day:date.getDate()}
      }
      
      //获取某年某月上个月days天日期
      ,getPreMonthDays:function(y,m,days){
          let num = []
          ,calNum = this.date.getDays(y,m-1);
          for(let i=calNum-days+1; i<=calNum; i++){
              num.push(i);
          }
          return num;
      }
      
      /**
       * 获取日历数据
       * getCalData(Date对象,'prev')--->获取当前年月的前一个月的，日历数据
       * getCalData(Date对象,'next')--->获取当前年月的下一个月的，日历数据
       * getCalData(Date对象,month)--->获取当年的指定月份的，日历数据
       * getCalData(year,month)-->获取2020年8月，日历数据
      * */
      ,getCalData:function(date,month){
          month = month||date.getMonth()+1;
          let isDate = this.isType('date')
          ,dateObj = this.date.getYMD(date)
          ,calData = [];
          if(isDate(date)){
              month == 'prev' && date.setFullYear(dateObj.year,dateObj.month-1)
              month == 'next' && date.setFullYear(dateObj.year,dateObj.month+1)
              typeof month == 'number' && (date = new Date(),date.setFullYear(date.getFullYear(),month-1))
          }else{
              /^\d{4}$/.test(date) && /^([1-9]|1[0-2]{1})$/.test(month) && (date = new Date(date,month-1))
          }
          let week = this.date.getFirstDayIsWeek(dateObj.year,dateObj.month)
          ,days = this.date.getDays(dateObj.year,dateObj.month)
          ,trs = Math.ceil((days+week)/7)
          ,fullDay = trs*7-week;
          //减去week天，就添加这些天
          Array.prototype.push.apply(calData,getPreMonthDays(dateObj.year,dateObj.month,week));
          Array.prototype.push.apply(calData,this.times(days));
          Array.prototype.push.apply(calData,this.times(fullDay-days));
          return this.toTwoArray(calData);
      }
      
      //dates:['2020-01','2019-04','2020-09']
      ,getYMDates:function(year,month,dates){
          let days = this.date.getDays(new Date(year,month));
          let regExpStr = year+"-"+this.date.addZero(month)+'-[0-'+days+']'
          , regExp = new RegExp(regExpStr);
          return dates.filter(function(date){
              return regExp.test(date);
          })
      }
      
      /**
       * 计时器
       * 参数：num 毫秒数
       */
      /* 例1：convertTime(10*1000)//10秒
       * 例2：convertTime(28*60*1000)//28分钟
       * 例3：convertTime(2*3600*1000)//2个小时
       * 例4：convertTime(2*60*60*1000+28*60*1000+10*1000)//2小时 28分钟 10秒
       * 例5：convertTime(2*3600*1000+3600*1000+60*1000)//3小时 1分钟 0秒
      */
      ,timer:function(num){
          num = parseInt(num/1000);
          var second = num%60
              ,minute = parseInt(num/60)%60
              ,hour = parseInt(num/3600);
          return this.addZero(hour)+":"+this.addZero(minute)+":"+this.addZero(second);
      }