这道题,我是用的时间戳做的,
Date.parse()将字符串或者时间对象直接转化成时间戳
var daysBetweenDates = function (date1, date2) {
let result = 0;
result = Math.abs(Date.parse(date1) - Date.parse(date2)) / 1000;
result = result / 60 / 60 / 24;
return result;
};