https://www.cnblogs.com/zyt-it/p/10338360.html
補充:獲取15天之前的日期,一天的秒鐘*14天等於14天的秒鐘,然後當前秒鐘-14*1000
var timestamp = (new Date()).valueOf();
let date = 86400*14
timestamp - date *1000
https://www.cnblogs.com/zyt-it/p/10338360.html
補充:獲取15天之前的日期,一天的秒鐘*14天等於14天的秒鐘,然後當前秒鐘-14*1000
var timestamp = (new Date()).valueOf();
let date = 86400*14
timestamp - date *1000