代码如下：
<html> <head> <title>生日倒计时_www.jb200.com</title> <b>今天距离2014年8月2日的生日还有</b><br> <script language="javascript"> <!-- 隐藏脚本从旧的浏览器 var DifferHour = -1 var DifferMinute = -1 var DifferSecond = -1 var Tday1 = new Date("Aug 2, 2014 20:00:00") //**倒计时时间-注意格式 var daysms = 24 * 60 * 60 * 1000 var hoursms = 60 * 60 * 1000 var Secondms = 60 * 1000 var microsecond = 1000 function clock() { var time = new Date() var hour = time.getHours() var minute = time.getMinutes() var second = time.getSeconds() var timevalue = ""+((hour > 12) ? hour-12:hour) timevalue +=((minute < 10) ? ":0":":")+minute timevalue +=((second < 10) ? ":0":":")+second timevalue +=((hour >12 ) ? " PM":" AM") var convertHour = DifferHour var convertMinute = DifferMinute var convertSecond = DifferSecond var Diffms = Tday1.getTime() - time.getTime() DifferHour = Math.floor(Diffms / daysms) Diffms -= DifferHour * daysms DifferMinute = Math.floor(Diffms / hoursms) Diffms -= DifferMinute * hoursms DifferSecond = Math.floor(Diffms / Secondms) Diffms -= DifferSecond * Secondms var dSecs = Math.floor(Diffms / microsecond) if(convertHour != DifferHour) document.formnow.dd.value=DifferHour if(convertMinute != DifferMinute) document.formnow.hh.value=DifferMinute if(convertSecond != DifferSecond) document.formnow.mm.value=DifferSecond document.formnow.ss.value=dSecs document.formnow.ss.value=dSecs // document.formnow.Tnow.value= DifferHour DifferMinute + DifferSecond + dSecs setTimeout("clock()",1000) } // 隐藏--> </script> </head> <body onload="clock();return true" text="red"> <!--显示出内容--> <form name="formnow"> <input name="dd" type="text" style="border:0;" size=2> 天 <input name="hh" type="text" style="border:0;" size=2> 小时 <input name="mm" type="text" style="border:0;" size=2> 分 <input name="ss" type="text" style="border:0;" size=2> 秒 </form> <!--倒计时完成--> </body> </html>