javascript计算两个日期之间相差几个月份详解编程语言

    function checkTime(obj){     
          var startTime= $(obj).parent().siblings().next().next().children().val();//到项目时间   
          var endTime= $(obj).parent().siblings().next().next().next().children().val();//离项目时间   
          var startDate=new Date(startTime.replace("-", "/").replace("-", "/"));     
          var endDate=new Date(endTime.replace("-", "/").replace("-", "/"));     
       
          var number = 0;       
          var yearToMonth = (endDate.getFullYear() - startDate.getFullYear()) * 12;       
          number += yearToMonth;       
          monthToMonth = endDate.getMonth() - startDate.getMonth();       
          number += monthToMonth;       
         //endDay = endDate.getDate();       
         //startDay = startDate.getDate();       
         //dayStep = endDay - startDay;       
         //if (dayStep >= 0) {       
         //    if (dayStep >= 15) {       
         //        number += 1;       
         //    }       
         //} else {       
         //    if (dayStep <= -15) {       
         //        number -= 1;       
         //    }       
         //}    
         $(obj).blur();   
         alert(parseInt(number  + 1) + " 人月 ");   
         return false;   
    }