写博客的时候需要计算一下博客运行的时间，记录一下。
<script> var startTime = "2020-09-02"; var calculationTime = function(startTime) { var s1 = new Date(startTime.replace(/-/g, "/")), s2 = new Date(), runTime = parseInt((s2.getTime() - s1.getTime()) / 1000); var year = Math.floor(runTime / 86400 / 365); runTime = runTime % (86400 * 365); var month = Math.floor(runTime / 86400 / 30); runTime = runTime % (86400 * 30); var day = Math.floor(runTime / 86400); runTime = runTime % 86400; var hour = Math.floor(runTime / 3600); runTime = runTime % 3600; var minute = Math.floor(runTime / 60); runTime = runTime % 60; var second = runTime; document.querySelector(".SiteRunningTime > .year").innerText = year; document.querySelector(".SiteRunningTime > .month").innerText = month; document.querySelector(".SiteRunningTime > .day").innerText = day; document.querySelector(".SiteRunningTime > .hour").innerText = hour; document.querySelector(".SiteRunningTime > .minute").innerText = minute; document.querySelector(".SiteRunningTime > .second").innerText = second }; setInterval("calculationTime(startTime)", 1000); </script> <span class="SiteRunningTime">该站点运行了<label class="year">0</label>年<label class="month">0</label>月<label class="day">0</label>日<label class="hour">0</label>时<label class="minute">0</label>分<label class="second">0</label>秒</span>