我正在为我的项目创建一个在线考试页面。我有一个倒数计时器，但它会在页面刷新时重置。我怎样才能让它不重置？ 定时器是通过从数据库中获取时间来设置的。我正在使用 php mysql。请帮我。 这是我的代码。
<?php
$result=mysql_query("select * from test where testid='29'");
while($time=mysql_fetch_array($result)){
$dateFormat = "d F Y -- g:i a";
$targetDate = time() + ($time['duration']*60);
$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, $remainingSeconds seconds";?>
</div>
最佳答案
您应该将该值读入 session 变量并在之后使用它:
<?php
session_start();
if (isset($_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);
?>
关于php - 如何使倒数计时器在页面刷新时不重置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11272190/