计算当前日期n天后的日期

//计算180天后的日期
//180*24*60*60*1000
//更具时间戳计算n天前的日期
 $(function () {
 var timestamp =Date.parse(new Date());
 
 var tenDayAgo=timestamp-15552000000;
 var timeAgo =new Date(tenDayAgo);
 
 var s2=timeAgo.getSeconds();
 
 var yearAgo=timeAgo.getFullYear();
 var monthAgo=timeAgo.getMonth()+1;
 var dayAge=timeAgo.getDate();
 var timeAgo2=yearAgo+"-"+monthAgo+"-"+dayAge

  alert(timeAgo2)
 });