<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh" lang="zh"> <head> <meta http-equiv="content-type" content="text/html;charset=gbk"/> <script src ="http://code.jquery.com/jquery-1.4.1.js"> </script> <script> var comnet = { send:function(){ var t = Date.parse(new Date()); $.ajax({ url:"test.php", data:"t="+t, dataType:"html", type:"POST", success:function(data){ $('body').append(data+'<br/>'); }, complete:function(){ setTimeout("comnet.send()",30000); } }); } } $(function(){ comnet.send(); }) </script> </head> <body> </body> </html>
php部分
<?php set_time_limit(0); $timeout = 30; $starttime = time(); $randnum = 30; while(true){ $curtime = time(); if( ($curtime - $starttime) > $timeout ){ echo 'system is timeout!'; break; }else{ $n = mt_rand(0, 100); if($n < $randnum){ /* * code here 请求数据库或者memcached */ echo '数据更新,推送成功-'.date('H:i:s'); break; } } sleep(1); } ?>
