Jquery根据年份和月份获取本月的开始/结束时间

  //获得本月的开始日期

   month.getMonthStartDate = function ()
  {
      var monthStartDate = new Date(nowyear, months, 1);
      return formatDate(monthStartDate);//返回当月第一天
  }

  //获得本月的结束日期 
   month.getMonthEndDate = function (nowyear,months)
  {
     var days= getMonthDays(months);//获取当月总共有多少天
     var monthEndDate = new Date(nowyear,months, days);
     return formatDate(monthEndDate);//返回当月结束时间
  }

---------------------------------------以下是调用的方法--------------------------------
  

   //格式化日期
   function formatDate(date)
  {
     var myyear = date.getFullYear();
     var mymonth = date.getMonth() + 1;
     var myweekday = date.getDate();
     if (mymonth < 10) 
      {
       mymonth = "0" + mymonth;
      }
     if (myweekday < 10) 
      {
      myweekday = "0" + myweekday;
      }
      return (myyear + "-" + mymonth + "-" + myweekday);
   }
   //获得某月的天数 
  function getMonthDays(nowyear,myMonth)
  {
     var monthStartDate = new Date(nowyear, myMonth, 1);
     var monthEndDate = new Date(nowyear, myMonth + 1, 1);
     var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);//格式转换
     return days;
   }