好吧,我正在试图建立一个AJAX聊天系统,每400ms轮询聊天数据库。该部分正在工作,其中的一部分不是活动用户列表。当我试图合并这两个请求时,前两个请求被完成,然后整个事情变得雪球起来,通常定时(12秒)的活动用户列表请求开始每1ms更新一次,第一个请求再也不会发生。显示的是两个请求整个AJAX代码:双AJAX请求在不同的时间
var waittime=400;chatmsg=document.getElementById("chatmsg");
room = document.getElementById("roomid").value;
chatmsg.focus()
document.getElementById("chatwindow").innerHTML = "loading...";
document.getElementById("userwindow").innerHTML = "Loading User List...";
var xmlhttp = false;
var xmlhttp2 = false;
var xmlhttp3 = false;
function ajax_read(url) {
if(window.XMLHttpRequest){
xmlhttp=new XMLHttpRequest();
if(xmlhttp.overrideMimeType){
xmlhttp.overrideMimeType('text/xml');
}
} else if(window.ActiveXObject){
try{
xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try{
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
} catch(e){
}
}
}
if(!xmlhttp) {
alert('Giving up :(Cannot create an XMLHTTP instance');
return false;
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState==4) {
document.getElementById("chatwindow").innerHTML = xmlhttp.responseText;
setTimeout("ajax_read('methods.php?method=r&room=" + room +"')", waittime);
}
}
xmlhttp.open('GET',url,true);
xmlhttp.send(null);
}
function user_read(url) {
if(window.XMLHttpRequest){
xmlhttp3=new XMLHttpRequest();
if(xmlhttp3.overrideMimeType){
xmlhttp3.overrideMimeType('text/xml');
}
} else if(window.ActiveXObject){
try{
xmlhttp3=new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try{
xmlhttp3=new ActiveXObject("Microsoft.XMLHTTP");
} catch(e){
}
}
}
if(!xmlhttp3) {
alert('Giving up :(Cannot create an XMLHTTP instance');
return false;
}
xmlhttp3.onreadystatechange = function() {
if (xmlhttp3.readyState==4) {
document.getElementById("userwindow").innerHTML = xmlhttp3.responseText;
setTimeout("ajax_read('methods.php?method=u&room=" + room +"')", 12000);
}
}
xmlhttp3.open('GET',url,true);
xmlhttp3.send(null);
}
function ajax_write(url){
if(window.XMLHttpRequest){
xmlhttp2=new XMLHttpRequest();
if(xmlhttp2.overrideMimeType){
xmlhttp2.overrideMimeType('text/xml');
}
} else if(window.ActiveXObject){
try{
xmlhttp2=new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
try{
xmlhttp2=new ActiveXObject("Microsoft.XMLHTTP");
} catch(e){
}
}
}
if(!xmlhttp2) {
alert('Giving up :(Cannot create an XMLHTTP instance');
return false;
}
xmlhttp2.open('GET',url,true);
xmlhttp2.send(null);
}
function submit_msg(){
nick = document.getElementById("chatnick").value;
msg = document.getElementById("chatmsg").value;
document.getElementById("chatmsg").value = "";
ajax_write("methods.php?method=w&m=" + msg + "&n=" + nick + "&room=" + room + "");
}
function keyup(arg1) {
if (arg1 == 13) submit_msg();
}
var intUpdate = setTimeout("ajax_read('methods.php')", waittime);
var intUpdate = setTimeout("user_read('methods.php')", waittime);
好吧,这几乎就像迷信,但我已经与并发的XMLHttpRequests(尤其是在IE) – Pointy 2010-06-15 23:49:31
厄运不幸,我宁愿不使用并发请求,但我不知道另一种方式来实现这一点。 – Nik 2010-06-15 23:55:03
也许尝试使用不同的等待时间来抵消这两个请求? – Banjer 2010-06-15 23:57:20