长轮询（在php中）在向数据库发出5个请求后开始挂起

我正在开发现场拍卖网站，带有实时竞价系统。当用户对项目出价时，我使用长轮询。我选择长轮询是因为WebSockets还不是很受支持，而且NODEJS对我来说现在实现起来非常复杂。所以我一直坚持使用simle ajax长轮询，这对于大约五次投标非常有效

因此，问题是：竞价对5-6个项目的竞价非常有效，竞价间隔为1秒（我从服务器ajax获得即时响应），但第7个（单击）竞价按钮此响应长轮询将挂起约16-22秒，然后完成请求。最后，数据库中的所有内容都会更新并完成，但每5-6次bids响应/ajax调用就会挂起16-22秒

我如何减少这段时间，无论用户出价多少次，一切都应该顺利进行，没有延迟…

我在localhost/wamp上使用Apache/PHP/MySql

<script type="text/javascript" charset="utf-8">             
var old_timestamp = <?php echo $old_timestamp;?>; //here i'm echoing last timestamp of         auction

function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
data: {"old_timestamp" : old_timestamp},
async: true,
cache: false,

success: function(data){
var json = eval('(' + data + ')');
if(json['msg'] != "") {
jq('#comet_display').html(json['msg']); //here I show ID of which auction item was bidded
}
old_timestamp = json['old_timestamp']; 
setTimeout('waitForMsg()',100);
},
error: function(XMLHttpRequest, textStatus, errorThrown){

setTimeout('waitForMsg()',1000);
}
});
}

jq(window).load(function(){ 
waitForMsg();
jq("#a_loader").show();
    var url = "http://localhost/bid/auctions-ajax"; // the script where you handle the form input.  
    jq.ajax({
           type: "POST",
           url: url,
           data: {au978 : true}, 
           async:false, //to sem dodal za časovni zamik
           success: function(data)
           {
             jq("#a_loader").hide();  
             jq("#show-category").html(data); // show response from the php script.              
           },
            error: function(result) {
                jq("#show-category").html("Sorry, something went wrong. Please try again later.");
            }
    });

});

function bid(id){

var url = "http://localhost/bid/comet/update-auction.php"; // the script where you handle the form input.
var user_id=<?php echo $user_id;?>; //user id from session
jq.ajax({
    type: "POST",
    url: url,
    data: {"auct_id" : id, "user_id" : user_id}, // serializes the form's elements.
    success: function(data)
    {
        //it updates in user table its remaining number of bids 
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Something went wrong. Click OK to refresh.");

    }
});
}

</script>

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);

$a=new Auction();

$old_timestamp = $_POST['old_timestamp']; 
$bidded_id=0;
$db=DB::getInstance();  
$sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";   //desno doda tabelo kategorija  
$stmt=$db->db->prepare($sql) or die("Prepare Error");   
$stmt->execute();   
$result2=$stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result2 as $rez){
    $current_timestamp=$rez['timestamp'];   
    $bidded_id=$rez['id'];
}
$stmt->closeCursor();


    while($current_timestamp <= $old_timestamp){
    usleep(1000);
    clearstatcache();
    $db=DB::getInstance();  
    $sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";       
    $stmt=$db->db->prepare($sql) or die("Prepare Error");   
    $stmt->execute();   
    $result=$stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($result as $rez){
        $current_timestamp=$rez['timestamp'];   
        $bidded_id=$rez['id'];
    }
    $stmt->closeCursor();

}
$response = array();
$response['msg'] = 'BID na avkciji: '.$bidded_id;
$response['old_timestamp'] = $current_timestamp;
echo json_encode($response);
 }else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
 }
?>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_USER);
require_once(CLASS_DB);
$u=new User(); 
$a=new Auction();
$auction_id=$_POST['auct_id'];
$user_id=$_POST['user_id'];
$date = new DateTime();
$timestamp=$date->getTimestamp();
$a->updateAuction($auction_id,$user_id,$timestamp/*,$bid_price,$bids_spent,$total_paid*/);
$u->updateUserBids($user_id);

}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>

我的代码： index.php

<script type="text/javascript" charset="utf-8">             
var old_timestamp = <?php echo $old_timestamp;?>; //here i'm echoing last timestamp of         auction

function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
data: {"old_timestamp" : old_timestamp},
async: true,
cache: false,

success: function(data){
var json = eval('(' + data + ')');
if(json['msg'] != "") {
jq('#comet_display').html(json['msg']); //here I show ID of which auction item was bidded
}
old_timestamp = json['old_timestamp']; 
setTimeout('waitForMsg()',100);
},
error: function(XMLHttpRequest, textStatus, errorThrown){

setTimeout('waitForMsg()',1000);
}
});
}

jq(window).load(function(){ 
waitForMsg();
jq("#a_loader").show();
    var url = "http://localhost/bid/auctions-ajax"; // the script where you handle the form input.  
    jq.ajax({
           type: "POST",
           url: url,
           data: {au978 : true}, 
           async:false, //to sem dodal za časovni zamik
           success: function(data)
           {
             jq("#a_loader").hide();  
             jq("#show-category").html(data); // show response from the php script.              
           },
            error: function(result) {
                jq("#show-category").html("Sorry, something went wrong. Please try again later.");
            }
    });

});

function bid(id){

var url = "http://localhost/bid/comet/update-auction.php"; // the script where you handle the form input.
var user_id=<?php echo $user_id;?>; //user id from session
jq.ajax({
    type: "POST",
    url: url,
    data: {"auct_id" : id, "user_id" : user_id}, // serializes the form's elements.
    success: function(data)
    {
        //it updates in user table its remaining number of bids 
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Something went wrong. Click OK to refresh.");

    }
});
}

</script>

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);

$a=new Auction();

$old_timestamp = $_POST['old_timestamp']; 
$bidded_id=0;
$db=DB::getInstance();  
$sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";   //desno doda tabelo kategorija  
$stmt=$db->db->prepare($sql) or die("Prepare Error");   
$stmt->execute();   
$result2=$stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result2 as $rez){
    $current_timestamp=$rez['timestamp'];   
    $bidded_id=$rez['id'];
}
$stmt->closeCursor();


    while($current_timestamp <= $old_timestamp){
    usleep(1000);
    clearstatcache();
    $db=DB::getInstance();  
    $sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";       
    $stmt=$db->db->prepare($sql) or die("Prepare Error");   
    $stmt->execute();   
    $result=$stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($result as $rez){
        $current_timestamp=$rez['timestamp'];   
        $bidded_id=$rez['id'];
    }
    $stmt->closeCursor();

}
$response = array();
$response['msg'] = 'BID na avkciji: '.$bidded_id;
$response['old_timestamp'] = $current_timestamp;
echo json_encode($response);
 }else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
 }
?>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_USER);
require_once(CLASS_DB);
$u=new User(); 
$a=new Auction();
$auction_id=$_POST['auct_id'];
$user_id=$_POST['user_id'];
$date = new DateTime();
$timestamp=$date->getTimestamp();
$a->updateAuction($auction_id,$user_id,$timestamp/*,$bid_price,$bids_spent,$total_paid*/);
$u->updateUserBids($user_id);

}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>

var old_timestamp=//我在这里重复拍卖的最后一个时间戳
函数waitForMsg（）{
jq.ajax({
类型：“POST”，
url:“http://localhost/bid/comet/poll.php",
数据：{“old_timestamp”：old_timestamp}，
async:true，
cache:false，
成功：功能（数据）{
var json=eval（“（“+data+”）”）；
如果（json['msg']！=“”）{
jq（'#comet_display'）.html（json['msg']）；//这里我显示了竞拍物品的ID
}
old_timestamp=json['old_timestamp']；
setTimeout（'waitForMsg（）'，100）；
},
错误：函数（XMLHttpRequest、textStatus、errorshown）{
setTimeout（'waitForMsg（）'，1000）；
}
});
}
jq（窗口）.load（函数（）{
waitForMsg（）；
jq（“#a#u loader”）.show（）；
变量url=”http://localhost/bid/auctions-ajax“；//处理表单输入的脚本。
jq.ajax({
类型：“POST”，
url:url，
数据：{au978:true}，
async:false，//到sem dodal začasovni zamik
成功：功能（数据）
{
jq（“#a#u加载器”）.hide（）；
jq（“#show category”）.html（数据）；//显示来自php脚本的响应。
},
错误：函数（结果）{
jq（“#show category”）.html（“抱歉，出现问题，请稍后再试。”）；
}
});
});
功能投标（id）{
变量url=”http://localhost/bid/comet/update-auction.php“；//处理表单输入的脚本。
var user_id=；//会话中的用户id
jq.ajax({
类型：“POST”，
url:url，
数据：{“auct_id”：id，“user_id”：user_id}，//序列化表单的元素。
成功：功能（数据）
{
//它会在用户表中更新其剩余的投标数量
},
错误：函数（XMLHttpRequest、textStatus、errorshown）{
警报（“出现问题。单击“确定”刷新”）；
}
});
}

poll.php

<script type="text/javascript" charset="utf-8">             
var old_timestamp = <?php echo $old_timestamp;?>; //here i'm echoing last timestamp of         auction

function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
data: {"old_timestamp" : old_timestamp},
async: true,
cache: false,

success: function(data){
var json = eval('(' + data + ')');
if(json['msg'] != "") {
jq('#comet_display').html(json['msg']); //here I show ID of which auction item was bidded
}
old_timestamp = json['old_timestamp']; 
setTimeout('waitForMsg()',100);
},
error: function(XMLHttpRequest, textStatus, errorThrown){

setTimeout('waitForMsg()',1000);
}
});
}

jq(window).load(function(){ 
waitForMsg();
jq("#a_loader").show();
    var url = "http://localhost/bid/auctions-ajax"; // the script where you handle the form input.  
    jq.ajax({
           type: "POST",
           url: url,
           data: {au978 : true}, 
           async:false, //to sem dodal za časovni zamik
           success: function(data)
           {
             jq("#a_loader").hide();  
             jq("#show-category").html(data); // show response from the php script.              
           },
            error: function(result) {
                jq("#show-category").html("Sorry, something went wrong. Please try again later.");
            }
    });

});

function bid(id){

var url = "http://localhost/bid/comet/update-auction.php"; // the script where you handle the form input.
var user_id=<?php echo $user_id;?>; //user id from session
jq.ajax({
    type: "POST",
    url: url,
    data: {"auct_id" : id, "user_id" : user_id}, // serializes the form's elements.
    success: function(data)
    {
        //it updates in user table its remaining number of bids 
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Something went wrong. Click OK to refresh.");

    }
});
}

</script>

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);

$a=new Auction();

$old_timestamp = $_POST['old_timestamp']; 
$bidded_id=0;
$db=DB::getInstance();  
$sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";   //desno doda tabelo kategorija  
$stmt=$db->db->prepare($sql) or die("Prepare Error");   
$stmt->execute();   
$result2=$stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result2 as $rez){
    $current_timestamp=$rez['timestamp'];   
    $bidded_id=$rez['id'];
}
$stmt->closeCursor();


    while($current_timestamp <= $old_timestamp){
    usleep(1000);
    clearstatcache();
    $db=DB::getInstance();  
    $sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";       
    $stmt=$db->db->prepare($sql) or die("Prepare Error");   
    $stmt->execute();   
    $result=$stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($result as $rez){
        $current_timestamp=$rez['timestamp'];   
        $bidded_id=$rez['id'];
    }
    $stmt->closeCursor();

}
$response = array();
$response['msg'] = 'BID na avkciji: '.$bidded_id;
$response['old_timestamp'] = $current_timestamp;
echo json_encode($response);
 }else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
 }
?>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_USER);
require_once(CLASS_DB);
$u=new User(); 
$a=new Auction();
$auction_id=$_POST['auct_id'];
$user_id=$_POST['user_id'];
$date = new DateTime();
$timestamp=$date->getTimestamp();
$a->updateAuction($auction_id,$user_id,$timestamp/*,$bid_price,$bids_spent,$total_paid*/);
$u->updateUserBids($user_id);

}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>

和更新auction.php

<script type="text/javascript" charset="utf-8">             
var old_timestamp = <?php echo $old_timestamp;?>; //here i'm echoing last timestamp of         auction

function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
data: {"old_timestamp" : old_timestamp},
async: true,
cache: false,

success: function(data){
var json = eval('(' + data + ')');
if(json['msg'] != "") {
jq('#comet_display').html(json['msg']); //here I show ID of which auction item was bidded
}
old_timestamp = json['old_timestamp']; 
setTimeout('waitForMsg()',100);
},
error: function(XMLHttpRequest, textStatus, errorThrown){

setTimeout('waitForMsg()',1000);
}
});
}

jq(window).load(function(){ 
waitForMsg();
jq("#a_loader").show();
    var url = "http://localhost/bid/auctions-ajax"; // the script where you handle the form input.  
    jq.ajax({
           type: "POST",
           url: url,
           data: {au978 : true}, 
           async:false, //to sem dodal za časovni zamik
           success: function(data)
           {
             jq("#a_loader").hide();  
             jq("#show-category").html(data); // show response from the php script.              
           },
            error: function(result) {
                jq("#show-category").html("Sorry, something went wrong. Please try again later.");
            }
    });

});

function bid(id){

var url = "http://localhost/bid/comet/update-auction.php"; // the script where you handle the form input.
var user_id=<?php echo $user_id;?>; //user id from session
jq.ajax({
    type: "POST",
    url: url,
    data: {"auct_id" : id, "user_id" : user_id}, // serializes the form's elements.
    success: function(data)
    {
        //it updates in user table its remaining number of bids 
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Something went wrong. Click OK to refresh.");

    }
});
}

</script>

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);

$a=new Auction();

$old_timestamp = $_POST['old_timestamp']; 
$bidded_id=0;
$db=DB::getInstance();  
$sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";   //desno doda tabelo kategorija  
$stmt=$db->db->prepare($sql) or die("Prepare Error");   
$stmt->execute();   
$result2=$stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result2 as $rez){
    $current_timestamp=$rez['timestamp'];   
    $bidded_id=$rez['id'];
}
$stmt->closeCursor();


    while($current_timestamp <= $old_timestamp){
    usleep(1000);
    clearstatcache();
    $db=DB::getInstance();  
    $sql="SELECT timestamp, id FROM auction ORDER BY timestamp DESC LIMIT 1";       
    $stmt=$db->db->prepare($sql) or die("Prepare Error");   
    $stmt->execute();   
    $result=$stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($result as $rez){
        $current_timestamp=$rez['timestamp'];   
        $bidded_id=$rez['id'];
    }
    $stmt->closeCursor();

}
$response = array();
$response['msg'] = 'BID na avkciji: '.$bidded_id;
$response['old_timestamp'] = $current_timestamp;
echo json_encode($response);
 }else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
 }
?>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_USER);
require_once(CLASS_DB);
$u=new User(); 
$a=new Auction();
$auction_id=$_POST['auct_id'];
$user_id=$_POST['user_id'];
$date = new DateTime();
$timestamp=$date->getTimestamp();
$a->updateAuction($auction_id,$user_id,$timestamp/*,$bid_price,$bids_spent,$total_paid*/);
$u->updateUserBids($user_id);

}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>

---

感谢您查看我的问题

考虑切换到WebSocket。它被设计用来解决长轮询问题。

好的，我找到了一个解决方案来解决这个17-22秒的延迟问题。现在它几乎是即时的，不管你点击多少次。但我仍然不确定，这是否是长时间投票的最佳解决方案

如果有人也有同样的问题，我会发布它

我将poll.php中的LONG POLLING函数改为：

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);

$a=new Auction();
$db=DB::getInstance();  
$sql="SELECT timestamp, id, last_username FROM auction ORDER BY timestamp DESC LIMIT 1";        
$response = array();
while(1)
{
    $stmt=$db->db->prepare($sql) or die("Prepare Error");   
    $stmt->execute();   
    $result=$stmt->fetch(PDO::FETCH_ASSOC);
    if (!empty($result)){
        $current_timestamp=$result['timestamp'];        
        $response['msg'] = 'New BID';
        $response['old_timestamp'] = $current_timestamp;
        echo json_encode($response);
        break;
    }   
    sleep(3000);
    clearstatcache();
}
}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>

<?php
$db=DB::getInstance();  
$sql="SELECT timestamp FROM auction ORDER BY timestamp DESC LIMIT 1";    
$stmt=$db->db->prepare($sql) or die("Prepare Error");   
$stmt->execute();   
$result2=$stmt->fetch(PDO::FETCH_ASSOC);
$old_id=0;
$last_timestamp=$result2['timestamp'];
?>
<script type="text/javascript" charset="utf-8">             
var last_timestamp = <?php echo $last_timestamp;?>;
var old_timestamp=0;

function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
async: true,
cache: false,

success: function(data){
var json = eval('(' + data + ')');
if(old_timestamp==0 || last_timestamp==old_timestamp){

}else{
    if(json['msg'] != "") {
    jq('#comet_display').html(json['msg']);
}
}
old_timestamp = json['old_timestamp']; 

setTimeout('waitForMsg()',500);
},
error: function(XMLHttpRequest, textStatus, errorThrown){

setTimeout('waitForMsg()',1000);
}
});
}

jq(window).load(function(){ 
waitForMsg();

});
function bid(id){   
var url = "http://localhost/bid/comet/update-auction.php"; //here I update auction and user's bids
var user_id=<?php echo json_encode($user_id);?>;
var user_name=<?php echo json_encode($user_name); ?>;
jq.ajax({
    type: "POST",
    async: true,
    cache: false,
    url: url,
    data: {"auct_id" : id, "user_id" : user_id, "username" : user_name}, // serializes the form's elements.
    success: function(data)
    {

        setTimeout('waitForMsg()',100);
        var cnt = parseInt(jq(".db_bids").text());
        if (!isNaN(cnt))
        {
            cnt--;
            jq(".db_bids").text(String(cnt));
        }    
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Something went wrong. Click OK to refresh.");

    }
});
}
</script>

现在我在index.php中进行如下轮询：

<?php

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/include/DEFINES.php');
require_once(CLASS_AUCTION);
require_once(CLASS_DB);

$a=new Auction();
$db=DB::getInstance();  
$sql="SELECT timestamp, id, last_username FROM auction ORDER BY timestamp DESC LIMIT 1";        
$response = array();
while(1)
{
    $stmt=$db->db->prepare($sql) or die("Prepare Error");   
    $stmt->execute();   
    $result=$stmt->fetch(PDO::FETCH_ASSOC);
    if (!empty($result)){
        $current_timestamp=$result['timestamp'];        
        $response['msg'] = 'New BID';
        $response['old_timestamp'] = $current_timestamp;
        echo json_encode($response);
        break;
    }   
    sleep(3000);
    clearstatcache();
}
}else{
require_once($_SERVER['DOCUMENT_ROOT'] . 'bid/errors/404.html');
}
?>

<?php
$db=DB::getInstance();  
$sql="SELECT timestamp FROM auction ORDER BY timestamp DESC LIMIT 1";    
$stmt=$db->db->prepare($sql) or die("Prepare Error");   
$stmt->execute();   
$result2=$stmt->fetch(PDO::FETCH_ASSOC);
$old_id=0;
$last_timestamp=$result2['timestamp'];
?>
<script type="text/javascript" charset="utf-8">             
var last_timestamp = <?php echo $last_timestamp;?>;
var old_timestamp=0;

function waitForMsg(){
jq.ajax({
type: "POST",
url: "http://localhost/bid/comet/poll.php",
async: true,
cache: false,

success: function(data){
var json = eval('(' + data + ')');
if(old_timestamp==0 || last_timestamp==old_timestamp){

}else{
    if(json['msg'] != "") {
    jq('#comet_display').html(json['msg']);
}
}
old_timestamp = json['old_timestamp']; 

setTimeout('waitForMsg()',500);
},
error: function(XMLHttpRequest, textStatus, errorThrown){

setTimeout('waitForMsg()',1000);
}
});
}

jq(window).load(function(){ 
waitForMsg();

});
function bid(id){   
var url = "http://localhost/bid/comet/update-auction.php"; //here I update auction and user's bids
var user_id=<?php echo json_encode($user_id);?>;
var user_name=<?php echo json_encode($user_name); ?>;
jq.ajax({
    type: "POST",
    async: true,
    cache: false,
    url: url,
    data: {"auct_id" : id, "user_id" : user_id, "username" : user_name}, // serializes the form's elements.
    success: function(data)
    {

        setTimeout('waitForMsg()',100);
        var cnt = parseInt(jq(".db_bids").text());
        if (!isNaN(cnt))
        {
            cnt--;
            jq(".db_bids").text(String(cnt));
        }    
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Something went wrong. Click OK to refresh.");

    }
});
}
</script>

var last_timestamp=；
var old_timestamp=0；
函数waitForMsg（）{
jq.ajax({
类型：“POST”，
url:“http://localhost/bid/comet/poll.php",
async:true，
cache:false，
成功：功能（数据）{
var json=eval（“（“+data+”）”）；
if（旧的|时间戳==0 | |最后的|时间戳==旧的|时间戳）{
}否则{
如果（json['msg']！=“”）{
jq（'comet_display'）.html（json['msg']）；
}
}
old_timestamp=json['old_timestamp']；
setTimeout（'waitForMsg（）'，500）；
},
错误：函数（XMLHttpRequest、textStatus、errorshown）{
setTimeout（'waitForMsg（）'，1000）；
}
});
}
jq（窗口）.load（函数（）{
waitForMsg（）；
});
函数bid（id）{
变量url=”http://localhost/bid/comet/update-auction.php“；//这里我更新了拍卖和用户的出价
var user_id=；
var user_name=；
jq.ajax({
类型：“POST”，
async:true，
cache:false，
url:url，
数据：{“auct_id”：id，“user_id”：user_id，“username”：user_name}，//序列化表单的元素。
成功：功能（数据）
{
setTimeout（'waitForMsg（）'，100）；
var cnt=parseInt（jq（“.db_bids”）.text（）；
如果（！isNaN（cnt））
{
碳纳米管；
jq（“.db_bids”）.text（字符串（cnt））；
}    
},
错误：函数（XMLHttpRequest、textStatus、errorshown）{
警报（“出现问题。单击“确定”刷新”）；
}
});
}

我仍在本地主机上开发它&将看到它在拥有100多个用户的真实服务器上的表现。

---

如果有人有更好更快的解决方案，可以从数据库进行长时间轮询，请告诉我：）

但是会更快吗？因为我想我可能有数据库问题。。。因为每件事都完成了，只需在5次出价后20秒左右。这在WebSocket中不是一样吗？而且交叉浏览器兼容性也是一个问题。。只有cca。60%的浏览器支持WebSocket。。。这不是一个评论吗？你在更多的客户身上测试过吗？