JS获取两个日期的月份差

function getMonthBetween(startDate,endDate){

startDate=new Date(startDate.replace(/-/g,'/'));

endDate=new Date(endDate.replace(/-/g,'/'));

var num=0;

var year=endDate.getFullYear()-startDate.getFullYear();

num+=year*12;

var month=endDate.getMonth()-startDate.getMonth();

num+=month;

var day=endDate.getDate()-startDate.getDate();

if(day>0){

//if(day>15){ num+=1; }

　　num+=1;

}else if(day<0){

//if(day<-15){num-=1; }

//num-=1;

}

return num;

}