js计算两个日期之间的差

var begin=beginTime;var end=endTime;if(begin!="" && end!=""){    var  aDate,  oDate1,  oDate2,  iDays ;    aDate  =  begin.split("-")      oDate1  =  new  Date(aDate[1]  +  '-'  +  aDate[2]  +  '-'  +  aDate[0])    //转换为12-18-2006格式      aDate  =  end.split("-")      oDate2  =  new  Date(aDate[1]  +  '-'  +  aDate[2]  +  '-'  +  aDate[0])      iDays  =  parseInt(Math.abs(oDate1  -  oDate2)  /  1000  /  60  /  60  /24)    //把相差的毫秒数转换为天数            alert("相差:"+iDays);}