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<!doctype html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> <title>Comet Test</title> <script src="../statics/js/jquery-1.9.1.min.js"></script> </head> <body> <script type="text/javascript"> $(function(){ function handleResponse(response){ $(‘#content‘).append(‘<div>‘ + response[‘msg‘] + ‘</div>‘); } var timestamp = 0; var url = ‘server.php‘; var noerror = true; var ajax; function connect() { ajax = $.ajax(url, { type: ‘get‘, data: { ‘timestamp‘ : timestamp }, success: function(transport) { eval(‘var response = ‘+transport); timestamp = response[‘timestamp‘]; handleResponse(response); noerror = true; }, complete: function(transport) { (!noerror) && setTimeout(function(){ connect() }, 5000) || connect(); noerror = false; } }); } function doRequest(request) { $.ajax(url, { type: ‘get‘, data: { ‘msg‘ : request } }); }; $(‘#cometForm‘).on("submit",function(){ doRequest($(‘#word‘).val()); $(‘#word‘).val(‘‘); return false; }); connect(); }); </script> <div id="content"></div> <div style="margin: 5px 0;"> <form action="javascript:void(0);" id="cometForm" method="get"> <input id="word" name="word" type="text" value=""> <input name="submit" type="submit" id="btn" value="Send"> </form></div> </body> </html>
<?php $filename = ‘F:\phpStudy\WWW\boss\cometDemo\data.txt‘; // 消息都储存在这个文件中 $msg = isset($_GET[‘msg‘]) ? $_GET[‘msg‘] : ‘‘; if ($msg != ‘‘){ //fopen()方法：如果文件不存在，则创建，如果存在则打开文件。它的第二个参数是打开的文件的模式，w表示覆盖式只写，详见《PHP高程设计》183页 $fn = fopen($filename,‘w‘); fwrite($fn,$msg); fclose($fn); // file_put_contents($filename,$msg); 此方法已不建议使用 } // 不停的循环，直到储存消息的文件被修改 $lastmodif = isset($_GET[‘timestamp‘]) ? $_GET[‘timestamp‘] : 0; $currentmodif = filemtime($filename); while ($currentmodif <= $lastmodif){ // 如果数据文件已经被修改 usleep(100000); // 100ms暂停 缓解CPU压力 clearstatcache(); //清除缓存信息 $currentmodif = filemtime($filename); } // 返回json数组 $response = array(); $response[‘msg‘] = file_get_contents($filename); $response[‘timestamp‘] = $currentmodif; echo json_encode($response); flush(); ?>
自备jquery1.9.1，并改写下txt文件的路径
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原文地址：http://www.cnblogs.com/macliu/p/5229170.html
