https://www.cnblogs.com/zyt-it/p/10338360.html
补充:获取15天之前的日期,一天的秒钟*14天等于14天的秒钟,然后当前秒钟-14*1000
var timestamp = (new Date()).valueOf();
let date = 86400*14
timestamp - date *1000
https://www.cnblogs.com/zyt-it/p/10338360.html
补充:获取15天之前的日期,一天的秒钟*14天等于14天的秒钟,然后当前秒钟-14*1000
var timestamp = (new Date()).valueOf();
let date = 86400*14
timestamp - date *1000