JS网站运行时长代码

显示区域

<span id="timeDate">载入天数...</span><span id="times">载入时分秒...</span>

JS部分

<script>
    var now = new Date(); 
    function createtime() { 
                          //月、日、年，小时、分、秒
        var grt= new Date("04/23/2020 12:00:00");//此处修改你的建站时间或者网站上线时间 
        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); 
        <!-- 加判断条件避免出现60秒的情况 -->
	if(snum==60){
	    snum=0;
	  }

	if(String(snum).length ==1 ){snum = "0" + snum;} 
        document.getElementById("timeDate").innerHTML = "本站已安全运行 "+dnum+" 天 "; 
        document.getElementById("times").innerHTML = hnum + " 小时 " + mnum + " 分 " + snum + " 秒"; 
    } 
setInterval("createtime()",250);
</script>

运行截图