在footer.php中插入以下代码即可
<span id="span"></span>
<script type="text/javascript">
function runtime(){
// DD/MM/YYYY hh:mm:ss
X = new Date("02/18/2020 15:12:00"); Y = new Date(); T = (Y.getTime()-X.getTime()); M = 24*60*60*1000;
a = T/M; A = Math.floor(a); b = (a-A)*24; B = Math.floor(b); c = (b-B)*60; C = Math.floor((b-B)*60); D = Math.floor((c-C)*60);
span.innerHTML = " | 已在风雨中度过: "+A+"天"+B+"小时"+C+"分"+D+"秒"
}
setInterval(runtime, 1000);
</script>
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