<iframe id="myiframe" src="http://www.8848.net/job.php"></iframe>
<script>
window.setInterval("myiframe.location='http://www.8848.net/job.php'",5000);
</script>
<script>
window.setInterval("myiframe.location='http://www.8848.net/job.php'",5000);
</script>
5秒一次