我需要一个javascript代码来实现超时，然后显示警报，然后重定向到另一个页面..
代码是：
<?php
session_start();
error_reporting(1);
include("database.php");
extract($_POST);
extract($_GET);
extract($_SESSION);
/*$rs=mysql_query("select * from mst_question where test_id=$tid",$cn) or die(mysql_error());
if($_SESSION[qn]>mysql_num_rows($rs))
{
unset($_SESSION[qn]);
exit;
}*/
if (isset($subid) && isset($testid)) {
$_SESSION[sid] = $subid;
$_SESSION[tid] = $testid;
$sqlq = "SELECT * FROM mst_result WHERE login='$login' and test_id='$testid'";
$er = mysqli_query($cn, $sqlq);
$rc = mysqli_num_rows($er);
if ($er > 0) {
echo " You have already given the exam";
echo " Click <font color='lightgreen'<a href='sublist.php'>Here</a></font> to return to exam menu";
} else {
header("location:quiz.php");
}
}
if (!isset($_SESSION[sid]) || !isset($_SESSION[tid])) {
header("location: index.php");
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript">
function myFunction() {
document.getElementById("myForm").submit();
}
function mf() {
myVar = setTimeout(myFunction, 3000);
}
</script>
<title>Online Quiz</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link href="quiz.css" rel="stylesheet" type="text/css">
</head>
<body background="css/bvc.jpg" onload="mf()">
<?php
include("header.php");
echo $time;
$query="select * from mst_question";
$rs=mysql_query("select * from mst_question where test_id=$tid",$cn) or die(mysql_error());
if(!isset($_SESSION[qn]))
{
$_SESSION[qn]=0;
mysql_query("delete from mst_useranswer where sess_id='" . session_id() ."'") or die(mysql_error());
$_SESSION[trueans]=0;
}
else
{
if($submit=='Next Question' && isset($ans))
{
mysql_data_seek($rs,$_SESSION[qn]);
$row= mysql_fetch_row($rs);
mysql_query("insert into mst_useranswer(sess_id, test_id, que_des, ans1,ans2,ans3,ans4,true_ans,your_ans) values ('".session_id()."', $tid,'$row[2]','$row[3]','$row[4]','$row[5]', '$row[6]','$row[7]','$ans')") or die(mysql_error());
if($ans==$row[7])
{
$_SESSION[trueans]=$_SESSION[trueans]+1;
}
$_SESSION[qn]=$_SESSION[qn]+1;
}
else if($submit=='Get Result' && isset($ans))
{
mysql_data_seek($rs,$_SESSION[qn]);
$row= mysql_fetch_row($rs);
mysql_query("insert into mst_useranswer(sess_id, test_id, que_des, ans1,ans2,ans3,ans4,true_ans,your_ans) values ('".session_id()."', $tid,'$row[2]','$row[3]','$row[4]','$row[5]', '$row[6]','$row[7]','$ans')") or die(mysql_error());
if($ans==$row[7])
{
$_SESSION[trueans]=$_SESSION[trueans]+1;
}
echo "<h1 class=head1> Result</h1>";
$_SESSION[qn]=$_SESSION[qn]+1;
echo "<Table align=center><tr class=tot><td>Total Question<td> $_SESSION[qn]";
echo "<tr class=tans><td>True Answer<td>".$_SESSION[trueans];
$w=$_SESSION[qn]-$_SESSION[trueans];
echo "<tr class=fans><td>Wrong Answer<td> ". $w;
echo "</table>";
mysql_query("insert into mst_result(login,test_id,test_date,score) values('$login',$tid,'".date("d/m/Y")."',$_SESSION[trueans])") or die(mysql_error());
echo "<h1 align=center><a href=review.php> Review Question</a>
</h1>";
unset($_SESSION[qn]);
unset($_SESSION[sid]);
unset($_SESSION[tid]);
unset($_SESSION[trueans]);
exit;
}
}
$rs=mysql_query("select * from mst_question where test_id=$tid",$cn) or die(mysql_error());
if($_SESSION[qn]>mysql_num_rows($rs)-1)
{
unset($_SESSION[qn]);
echo "<h1 class=head1>Some Error Occured</h1>";
session_destroy();
echo "Please <a href=index.php> Start Again</a>";
exit;
}
mysql_data_seek($rs,$_SESSION[qn]);
$row= mysql_fetch_row($rs);
echo "<form id=myForm method=post action=quiz.php>";
echo "<table width=100%> <tr> <td width=30> <td> <table border=0>";
$n=$_SESSION[qn]+1;
echo "<tR><td><span class=style2>Que ". $n .": $row[2]</style>";
echo "<tr><td class=style8><input type=radio name=ans value=1>$row[3]";
echo "<tr><td class=style8> <input type=radio name=ans value=2>$row[4]";
echo "<tr><td class=style8><input type=radio name=ans value=3>$row[5]";
echo "<tr><td class=style8><input type=radio name=ans value=4>$row[6]";
if($_SESSION[qn]<mysql_num_rows($rs)-1)
echo "<tr><td><input type=submit name=submit value='Next Question'></form>";
else
echo "<tr><td><input type=submit id='t1' name=submit value='Get Result'> </form>";
echo "</table></table>";
?>
</body>
</html>
我被困在js函数中：
<script type="text/javascript">
function myFunction() {
document.getElementById("myForm").submit();
}
function mf()
{
myVar = setTimeout(myFunction, 3000);
}
</script>
答案 0 :(得分：0)
可能查看代码我发现在提交表单后你必须等待X时间然后重定向它。
我建议您使用ajax。没关系。这可以解决您的需求
Android SDK Build-Tools答案 1 :(得分：0)
如果我正确理解您的问题，此功能应该按照您的要求执行。此功能允许您传入参数，使其在整个代码中更具动态性和可重用性（如果您需要多个位置的此功能）。这非常简单并且有评论。
function alertAndRedirectAfterTimeout(timeoutDuration, alertMsgText, redirectUrl) {
setTimeout(function() { /*setTimeout is a "built-in" js function that will call a callback function ONE TIME after a specified duration (in milliseconds)*/
alert(alertMsgText); /*another "built-in" js function that will show an alert on screen*/
window.location.replace('https://www.w3schools.com/js/js_window_location.asp'); /*this is one way to re-direct the browser window to a url*/
}, timeoutDuration);
}
/*call the function - you could use this as an event handling function for example when the user clicks on a submit button*/
alertAndRedirectAfterTimeout(2500, 'Redirecting to W3 Schools after 2.5 seconds!', 'https://www.w3schools.com/js/js_window_location.asp');