js中计算一个时间点加上一个时间段后的时间

function aa(a,b){
	console.log(111,a,b)
	var nd = new Date(Date.parse(a.replace(/-/g, "/"))); //改为标准格式：2016/04/05 09:29:15
	nd = nd.valueOf(); //转换为毫秒数
	nd = nd + Number(b)
	nd = new Date(nd);
	var y = nd.getFullYear();
	var m = nd.getMonth()+1;
	var d = nd.getDate();
	var hh = nd.getHours();
	var mm = nd.getMinutes();
	var ss = nd.getSeconds();
	if(m <= 9) m = "0"+m;
	if(d <= 9) d = "0"+d; 
	if(hh<= 9) hh = "0"+hh;
	if(mm<= 9) mm = "0"+mm;
	if(ss<= 9) ss = "0"+ss;
	var date = y+"-"+m+"-"+d+" "+hh+":"+mm+":"+ss;
	return date; //结束时间 2016-04-07 13:34:15
};

console.log(aa('2020-11-23 00:00:00', 60*1000))

参考地址： https://blog.csdn.net/qq_30051139/article/details/51062495