<script>

 //本月第一天 

 function showFirstDay() 

 { 

     var Nowdate=new Date(); 

     var MonthFirstDay=new Date(Nowdate.getYear(),Nowdate.getMonth(),1).getDate();

      return MonthFirstDay; 

      }

       //本月最后一天 

       function showLastDay() 

       {

            var Nowdate=new Date();

             var tmpDate=new Date(Nowdate.getYear(),Nowdate.getMonth()+1,1); 

             //tmpDate.setDate(tmpDate.getDate() -1); 

             //return new Date(Nowdate.getYear(),Nowdate.getMonth(),tmpDate.getDate()); 

             var MonthLastDay=new Date(tmpDate-86400000).getDate();

            return MonthLastDay;

     } 

     var last = showLastDay(); 

     var start = showFirstDay();

      var date = new Date(); 

      var a = new Array(); 

      for(var i=start;i<=last;i++)

      { 

          a[i-1] = (date.getMonth()+1)+"-"+i;

           } 

</script>