
实现代码:
<html><head><script type="text/javascript">function startTime(){var today=new Date()var h=today.getHours()var m=today.getMinutes()var s=today.getSeconds()// add a zero in front of numbers<10m=checkTime(m)s=checkTime(s)document.getElementById("txt").innerHTML=h+":"+m+":"+st=setTimeout("startTime()",500)}function checkTime(i){if (i<10){i="0" + i} return i}</script></head><body onload="startTime()"><div id="txt"></div></body></html>希望本文所述对大家的javascript程序设计有所帮助。