js判斷日期間隔

var startDate='2017-01-21'; var endDate='2016-01-22'; var startTime = new Date(Date.parse(startDate.replace(/-/g, "/"))).getTime();
var endTime = new Date(Date.parse(endDate.replace(/-/g, "/"))).getTime();
var dates = Math.abs((startTime - endTime))/(10006060*24);
alert(dates);