<!DOCTYPE html>charset="utf-8"W3Cschool教程(w3cschool.cn)id="demo"单击按钮显示修改后的秒数和毫秒数:onclick="myFunction()"点我function myFunction(){var d = new Date();d.setSeconds(35,825);var s = d.getSeconds();var ms = d.getMilliseconds();var x = document.getElementById("demo");x.innerHTML=s + ":" + ms;}