<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" src="http:///libs/jquery/1.8.1/jquery.min.js"></script>
</head>
<body>
<div class="tmp">123</div>
<script type="text/javascript">
// post 请求
function clin_post(){
$.post("test.php",function(data){
$('.tmp').html(data);
clin_post();
},'json');
}
clin_post();
</script>
</body>
</html>
用js发起请求的回调中再次发起请求 即可得到一个轮询
php服务端可以用时间限制
<?php
$start_time = time();
$num = 5;
$diff_time = 0;
while( ($num - $diff_time)>0 ) {
$now = time();
$diff_time = $now - $start_time;
}
echo json_encode(date('Y-m-d H:i:s'));?>
或者直接用sleep函数
<?php
sleep(5);
echo json_encode(date('Y-m-d H:i:s'));
?>
