Question

我正在创建一个在线考试..我得到了我的计时器30分钟它将自动提交考试但每次刷新或重新加载时间恢复30分钟是否有任何方法来预防它？提前谢谢

   <?php
session_start();
if (isset($_SESSION['targetdate'])) {
    // session variable_exists, use that
    $targetDate = $_SESSION['targetdate'];
} else {
    // No session variable, red from mysql
    $result=mysql_query("select * from test where testid='29' LIMIT 1");
    $time=mysql_fetch_array($result);
    $dateFormat = "d F Y -- g:i a";
    $targetDate = time() + ($time['duration']*60);
    $_SESSION['targetdate'] = $targetDate;

}

$actualDate = time();
$secondsDiff = $targetDate - $actualDate;
$remainingDay     = floor($secondsDiff/60/60/24);
$remainingHour    = floor(($secondsDiff-($remainingDay*60*60*24))/60/60);
$remainingMinutes = floor(($secondsDiff-($remainingDay*60*60*24)-         ($remainingHour*60*60))/60);
$remainingSeconds = floor(($secondsDiff-($remainingDay*60*60*24)-    ($remainingHour*60*60))-($remainingMinutes*60));
$actualDateDisplay = date($dateFormat,$actualDate);
$targetDateDisplay = date($dateFormat,$targetDate);

?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script type="text/javascript">
 var days = <?php echo $remainingDay; ?>  
var hours = <?php echo $remainingHour; ?>  
var minutes = <?php echo $remainingMinutes; ?>  
var seconds = <?php echo $remainingSeconds; ?> 
function setCountDown ()
{
 seconds--;
 if (seconds < 0){
    minutes--;
    seconds = 59
 }
 if (minutes < 0){
     hours--;
     minutes = 59
 }
  if (hours < 0){
  hours = 23
 }
  document.getElementById("remain").innerHTML = "  "+hours+" hr "+minutes+" min    "+seconds+" sec";
  SD=window.setTimeout( "setCountDown()", 1000 );
  if (minutes == '00' && seconds == '00') { seconds = "00"; window.clearTimeout(SD);
    window.location = "result.php"
} 

  }
 </script>

</head>
<body onLoad="setCountDown();">
 <div id="remain"><?php echo "$remainingHour hours, $remainingMinutes minutes,      $remainingSeconds seconds";?></div>

我只是复制这段代码我想限制测验计时器只有30分钟，什么是$ _SESSION ['targetdate'] ??

Answer 1

不，这是不可能的。 PHP是一种服务器端语言，对客户端没有任何影响。

即使有可能，这样做只会让用户烦恼。当他们按下刷新按钮时，他们希望页面刷新

Answer 2

您可以通过onbeforeunload事件监听器https://developer.mozilla.org/en-US/docs/Web/API/Window.onbeforeunload

在浏览器中捕获更新

可以在php中禁用刷新按钮吗？

2 个答案: