js统计网站运行时长

第一种：

<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()
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(2016,5,2,11,19,00)
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>

<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()

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(2016,5,2,11,19,00)

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>

注释：代码中的 var t1 = Date.UTC(2016,5,2,11,19,00) 是网站上线时间(自己定义)，2016,5,2,11,19,00 为 2016年4月2日11点19分00秒(月份0-11之间的整)

第二种：

<script language="javascript">
var now=new Date();var spday=new Date(2016,09,22);a=(now.getTime()-spday.getTime())/(24*60*60*1000);a=Math.ceil(a); document.write
("<b>"+a+"</b>");</script>天

注释：代码中的 Date(2016,09,22) 是网站上线时间(自己定义)，2016,09,22 为 2016年8月22日(月份0-11之间的整)