<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml"><head> <meta charset="utf-8" /> <title></title> <style> #mytime { text-align: center; } </style> <script> function two_char(n) { return n >= 10 ? n : "0" + n; } function time_fun() { var sec=0; setInterval(function () { sec++; var date = new Date(0, 0) date.setSeconds(sec); var h = date.getHours(), m = date.getMinutes(), s = date.getSeconds(); document.getElementById("mytime").innerText = two_char(h) + ":" + two_char(m) + ":" + two_char(s); }, 1000); } </script></head><body onload="time_fun()"> <h1 id="mytime">00:00:00</h1></body></html>注意：有道等翻译软件自动将网页由英文转换为中文会导致计时器中英文（数字与汉字）切换问题