js防刷新的倒计时代码(未测试)

来源：互联网发布：windows xp的外观设置编辑：程序博客网时间：2024/06/08 14:22

[JavaScript]代码

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">    <html xmlns="http://www.w3.org/1999/xhtml">    <head>    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />    <title>前端开发</title>    </head>         <body>    <SCRIPT LANGUAGE="JavaScript">    var maxtime;    if(window.name==''){     maxtime = 1*60;    }else{    maxtime = window.name;    }         function CountDown(){    if(maxtime>=0){    hours = Math.floor(maxtime/3600);    minutes = Math.floor((maxtime-hours*3600)/60);    seconds = Math.floor(maxtime%60);    msg = "距离考试结束还有"+hours+"时"+minutes+"分"+seconds+"秒";    document.all["timer"].innerHTML = msg;    if(maxtime == 5*60) alert('注意，还有5分钟!');    --maxtime;    window.name = maxtime;     }    else{    clearInterval(timer);    alert("考试时间到，结束!");    }    }    timer = setInterval("CountDown()",1000);    </SCRIPT>    <div id="timer" style="color:red"></div>          </body>    </html>

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