最近闲着无聊，看到很多博客底下都添加有网站运行天数代码，所以百度了一下，做一个记录。

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<span id="showsectime" style="color:#FF0000;"></span>
<script type="text/javascript">
function NewDate(str) { 
str = str.split('-'); 
var date = new Date(); 
date.setUTCFullYear(str[0], str[1] - 1, str[2]); 
date.setUTCHours(0, 0, 0, 0); 
return date; 
} 
function showsectime() {
var birthDay =NewDate("2015-10-21");
var today=new Date();
var timeold=today.getTime()-birthDay.getTime();
var sectimeold=timeold/1000
var secondsold=Math.floor(sectimeold);
var msPerDay=24*60*60*1000; var e_daysold=timeold/msPerDay;
var daysold=Math.floor(e_daysold);
var e_hrsold=(daysold-e_daysold)*-24;
var hrsold=Math.floor(e_hrsold);
var e_minsold=(hrsold-e_hrsold)*-60;
var minsold=Math.floor((hrsold-e_hrsold)*-60); var seconds=Math.floor((minsold-e_minsold)*-60).toString();
document.getElementById("showsectime").innerHTML = "本站已安全运行"+daysold+"天"+hrsold+"小时"+minsold+"分"+seconds+"秒";
setTimeout(showsectime, 1000);
}showsectime();
</script>
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