前言：
看了很多小伙伴都来问我页脚的运行时间怎么搞 ~~呸，就一个而已φ(*￣0￣)~~ 所以我就来写个教程ヾ(≧▽≦*)o

教程开始

Duration.js

新建一个文件并命名为duration.js，并将这个文件放到 [blog]\themes\butterfly\source\js 目录下（blog即为你的博客目录）
打开文件，输入以下内容(里面的内容需要自行修改，例如时间等)

!(function() {
function update() {
var now = new Date();
var grt = new Date("2021-06-05 00:00:00"); /** 此处是计时的起始时间 **/
now.setTime(now.getTime()+250);
days = (now - grt ) / 1000 / 60 / 60 / 24;
dnum = Math.floor(days);
hours = (now - grt ) / 1000 / 60 / 60 - (24 * dnum);
hnum = Math.floor(hours);
if(String(hnum).length === 1 ){
hnum = "0" + hnum;
}
minutes = (now - grt ) / 1000 /60 - (24 * 60 * dnum) - (60 * hnum);
mnum = Math.floor(minutes);
if(String(mnum).length === 1 ){
mnum = "0" + mnum;
}
seconds = (now - grt ) / 1000 - (24 * 60 * 60 * dnum) - (60 * 60 * hnum) - (60 * mnum);
snum = Math.round(seconds);
if(String(snum).length === 1 ){
snum = "0" + snum;
}
document.getElementById("timeDate").innerHTML = "本站已非常安全运行&nbsp"+dnum+"&nbsp天";
document.getElementById("times").innerHTML = hnum + "&nbsp小时&nbsp" + mnum + "&nbsp分&nbsp" + snum + "&nbsp秒";
}
setInterval(update, 1000);
})();