我有以下代码：
<script>
var interval;
var minutes = 0;
var seconds = 5;
function countdown(element) {
interval = setInterval(function() {
var el = document.getElementById(element);
if(seconds == 0) {
if(minutes == 0) {
el.innerHTML = "<a href=http://www.parkho.ir/phpvms/admin/index.php/aircraftmanager/update>Hello</a>";
clearInterval(interval);
return;
} else {
minutes--;
seconds = 60;
}
}
if(minutes > 0) {
var minute_text = minutes + (minutes > 1 ? ' minutes' : ' minute');
} else {
var minute_text = '';
}
var second_text = seconds > 1 ? 'seconds' : 'second';
el.innerHTML = minute_text + ' ' + seconds + ' ' + second_text + ' remaining';
seconds--;
}, 1000);
}
</script>
<h3><?php echo $title ;?></h3>
<head>
<link rel="stylesheet" href="./css/style.css" type="text/css" />
<script type="text/javascript" src="<?php echo fileurl('lib/js/jquery-1.3.1.min.js');?>"></script>
<script type="text/javascript" src="<?php echo fileurl('lib/js/jquery.tablesorter.js');?>"></script>
<script type="text/javascript" src="<?php echo fileurl('lib/js/jquery.tablesorter.pager1.js');?>"></script>
</head>
<body>
<div align="left" id="pager" class="pager">
<table width="50%" align="center">
<form>
<tr>
<td align="center"><img src="<?php echo fileurl('lib/images/first.png');?>" class="first"/>
<img src="<?php echo fileurl('lib/images/prev.png');?>" class="prev"/></td>
<td align="center"><input width="5" valign="top" type="text" class="pagedisplay"/></td>
<td align="center"><img src="<?php echo fileurl('lib/images/next.png');?>" class="next"/>
<img src="<?php echo fileurl('lib/images/last.png');?>" class="last"/></td>
<td align="center"><select class="pagesize">
<option value="10">5 per page</option>
<option value="20">10 per page</option>
<option value="50">25 per page</option>
</select>
</td>
</tr>
</form>
</table>
</div>
<script defer="defer">
$(document).ready(function()
{
$("#insured_list")
.tablesorter({widthFixed: true, widgets: ['zebra']})
.tablesorterPager({container: $("#pager")});
}
);
</script>
<table id="insured_list" align="center" border="1" width="100%" cellpadding="0" cellspacing="0">
<thead>
<th align="center" colspan="10"><font color="black" size="6"><b>Aircraft Manager</b></font></th>
<tr>
<td align="left" colspan="0"><a href="<?php echo adminurl('/aircraftmanager/allac?available=0') ;?>"><input type="button" value="Inactive All Aircraft"></a></td>
<td align="left" colspan="0"><a href="<?php echo adminurl('/aircraftmanager/allac?available=1') ;?>"><input type="button" value="Active All Aircraft"></a></td>
<td align="left" colspan="0"><a href="<?php echo adminurl('/aircraftmanager/update') ;?>"><input type="button" value="Update Status"></a></td>
<td align="left" colspan="0"><a href="<?php echo adminurl('/aircraftmanager/status?available=100') ;?>"><input type="button" value="Reset Status"></a></td>
</tr>
<tr>
<td align="center"><b>ID</b></td>
<td align="center"><b>Name</b></td>
<td align="center"><b>Registration</b></td>
<td align="center"><b>Location</b></td>
<td align="center"><b>Status</b></td>
<td align="center"><b>Time</b></td>
<td align="center" colspan="2"><b>Options</b></td>
</tr>
</thead>
<tbody)
<?php
$i=0;
foreach($aircrafts as $aircraft)
{
$air = AManagerData::getaircraftdetail($aircraft->id);
?>
<tr>
<td align="center"><?php echo $aircraft->id ;?></td>
<td align="center"><?php echo $aircraft->fullname ;?></td>
<td align="center"><?php echo $aircraft->registration ;?></td>
<td align="center">
<?php
$location = AManagerData::getaircraftlocation($aircraft->id);
echo $location->arricao;
?>
</td>
<td align="center">
<?php
$param = AManagerData::getaircraftparam($aircraft->id);
$stat = $param->start;
echo $stat.'%';
?>
</td>
<td align="center">
<div id='countdown'></div>
</td>
<td align="center">
<a class="{button:{icons:{primary:'ui-icon-arrowthick-1-s'}}}" href="#" onclick="$('#details_dialog_<?php echo $aircraft->id;?>').toggle()"><input type="button" Value="Parameters"></a>
</form>
</td>
<td align="center">
<?php
if(PilotGroups::group_has_perm(Auth::$usergroups, FULL_ADMIN))
{
$pilotid = $pilot->pilotid;
?>
<form id="deletepilot" method="get" action="<?php echo adminurl('/pilotmanager/deletePilot');?>">
<input type="hidden" name="pilotid" value="<?php echo $pilotid ;?>" />
<input type="submit" name="submit" value="Delete" onclick="return doublecheck()" ;?>
</form>
<?php
}
?>
</td>
</tr>
<tr>
<td colspan="10">
<form action="<?php echo adminaction('/aircraftmanager/param');?>" method="GET">
<table align="center" border="0" id="details_dialog_<?php echo $aircraft->id;?>" style="display:none" width="100%">
<tr>
<th align="center" bgcolor="black" colspan="0"><font color="white">Aircraft Parameter Setting</font></th>
</tr>
<tr>
<td><b> Start:</b></td>
<td><input type="radio" name="perstart" value="100" checked="checked" >100%
<input type="radio" name="perstart" value="75" >75%
<input type="radio" name="perstart" value="50" >50%</td>
<td><b> Hard Landing:</b></td>
<td><input type="radio" name="perhard" value="30" checked="checked" >30%
<input type="radio" name="perhard" value="20" >20%
<input type="radio" name="perhard" value="15" >15%</td>
</tr>
<tr>
<td><b> Smooth Landing:</b></td>
<td><input type="radio" name="persoft" value="2" checked="checked" >2%
<input type="radio" name="persoft" value="4" >4%
<input type="radio" name="persoft" value="10" >10%</td>
<td><b> Before Inactivity:</b></td>
<td><input type="radio" name="perhour" value="800" checked="checked" >800 hrs
<input type="radio" name="perhour" value="600" >600 hrs
<input type="radio" name="perhour" value="400" >400 hrs</td>
</tr>
<tr>
<td><b> Maintenance Period:</b></td>
<td><input type="radio" name="mhours" value="12" checked="checked" >12 hrs
<input type="radio" name="mhours" value="24" >24 hrs
<input type="radio" name="mhours" value="36" >36 hrs</td>
<td><b> Maximum Landing Rate:</b></td>
<td><input type="radio" name="maxlr" value="-600" checked="checked" >600 ft/m
<input type="radio" name="maxlr" value="-450" >450 ft/m
<input type="radio" name="maxlr" value="-300" >300 ft/m</td>
</tr>
<tr><td colspan="4"><hr></td></tr>
<tr>
<td colspan="0" align="center"><input type="hidden" name ="aircraft" value="<?php echo $aircraft->id ;?>"><input type="submit" value="Apply Settings"></td>
</tr>
</table>
</form>
</td>
</tr>
<?php
}
?>
<script type="text/javascript">
function doublecheck()
{
var answer = confirm("Are you sure you want to delete the aircraft?")
if (answer) {
return true;
}
return false;
}
</script>
</tbody>
</table>
</body>
我要做的是在foreach（）循环中显示倒计时器，但只有第一个记录显示计时器，其余的将显示空白。 这是我显示计时器的行：
<td align="center">
<div id='countdown'></div>
</td>
请告诉我我错在哪里或者这样做是否可行。 谢谢