<html><body><p>单击该按钮可显示 UTC 时间。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>function addZero(i) { if (i < 10) { i = "0" + i; } return i;}function myFunction() { var d = new Date(); var x = document.getElementById("demo"); var h = addZero(d.getUTCHours()); var m = addZero(d.getUTCMinutes()); var s = addZero(d.getUTCSeconds()); x.innerHTML = h + ":" + m + ":" + s;}</script></body></html>