缘由
看到一些网站有一个炫酷的网站运行时间的代码，就搞了一下。感觉不错！后来因拖慢网站就放弃了！
代码
<span id=sitetime></span>
<script language=javascript>
function siteTime(){
window.setTimeout(siteTime(), 1000);
var seconds = 1000;
var minutes = seconds * 60;
var hours = minutes * 60;
var days = hours * 24;
var years = days * 365;
var today = new Date();
var todayYear = today.getFullYear();
var todayMonth = today.getMonth()+1;
var todayDate = today.getDate();
var todayHour = today.getHours();
var todayMinute = today.getMinutes();
var todaySecond = today.getSeconds();
/* Date.UTC() -- 返回date对象距世界标准时间(UTC)1970年1月1日午夜之间的毫秒数(时间戳)
year - 作为date对象的年份，为4位年份值
month - 0-11之间的整数，做为date对象的月份
day - 1-31之间的整数，做为date对象的天数
hours - 0(午夜24点)-23之间的整数，做为date对象的小时数
minutes - 0-59之间的整数，做为date对象的分钟数
seconds - 0-59之间的整数，做为date对象的秒数
microseconds - 0-999之间的整数，做为date对象的毫秒数 */
var t1 = Date.UTC(2016,12,01,00,00,00); //北京时间2016-12-1 00:00:00
var t2 = Date.UTC(todayYear,todayMonth,todayDate,todayHour,todayMinute,todaySecond);
var diff = t2-t1;
var diffYears = Math.floor(diff/years);
var diffDays = Math.floor((diff/days)-diffYears*365);
var diffHours = Math.floor((diff-(diffYears*365+diffDays)*days)/hours);
var diffMinutes = Math.floor((diff-(diffYears*365+diffDays)*days-diffHours*hours)/minutes);
var diffSeconds = Math.floor((diff-(diffYears*365+diffDays)*days-diffHours*hours-diffMinutes*minutes)/seconds);
document.getElementById(sitetime).innerHTML= 已运行+diffYears+ 年 +diffDays+ 天 +diffHours+ 小时 +diffMinutes+ 分钟 +diffSeconds+ 秒;
}
siteTime();
</script>
注意修改
把t1修改成你的网站起始运行时间即可
