<!DOCTYPE html>charset="utf-8"W3Cschool教程(w3cschool.cn)id="demo"单击按钮显示此时的时间:onclick="myFunction()"点我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.getHours());var m=addZero(d.getMinutes());var s=addZero(d.getSeconds());x.innerHTML=h + ":" + m + ":" + s;}