一、直接粘贴代码(一般放到 html 的 </body> 标签之前),Date("10/11/2017 7:00:00") 改成自己要的时间
<script type="text/javascript">
function show_runtime() {
window.setTimeout("show_runtime()", 1000);
X = new Date("10/11/2017 7:00:00");
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);
runtime_span.innerHTML = "网站在各种灾难中运行了: " + A + "天" + B + "小时" + C + "分" + D + "秒"
}
show_runtime();
</script>
二、在哪个地方显示就贴下面的代码(一般在footer)
<span id="runtime_span"></span>







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