js防刷新的倒计时代码

[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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js防刷新的倒计时代码

[JavaScript]代码
