js中计算两个日期之差

var aBgnDate, aEndDate;           var oBgnDate, oEndDate;           var nYlts;           aBgnDate = strBgnDate.split('-');           aEndDate = strEndDate.split('-');           oBgnDate = new Date(aBgnDate[1] + '-' + aBgnDate[2] + '-' + aBgnDate[0]);           oEndDate = new Date(aEndDate[1] + '-' + aEndDate[2] + '-' + aEndDate[0]);           //把相差的毫秒数转换为天数           nYlts = parseInt(Math.abs(oEndDate - oBgnDate) / 1000 / 60 / 60 / 24);