增加了Ajax最新评论自动提示功能

又调试了3个小时，好累……不过还算学到个不大不小的东西把，起码再次领悟了ajax的流程……

这个功能是这样的：当你在浏览本站任何一个页面时，若另外一个人在某篇文章中发表了一条评论，则你正在看的网页上方会自动弹出来一个框，提示你有一条新评论，下面有个链接，可以点进去具体查看本条评论，整个过程都是在页面不刷新的情况下进行的哦，所以完全不影响你浏览文章，所说的效果如下：

把JS代码发来共享，PHP代码涉及数据库安全就不发了 = =

JavaScript代码

var oXmlHttp = null;
var interval = 1000;
var lastCommentId = -1;
var divNotification = null;
function showNotification (article_id,name,message) {
/*if (!divNotification) {
divNotification = document.createElement("div");
divNotification.className = "notification";
document.body.appendChild(divNotification);
}*/
divNotification = document.getElementById("divNotification");
divNotification.innerHTML = "There is a new comment!(有人发表了一条最新评论!) " + name + " says(说):" + message + "... <a class=\"tip\" href=\"view.php?id=" + article_id + "#cmtid" + lastCommentId + "\">view this comment(查看这条评论)</a>";
divNotification.style.top = document.body.scrollTop + "px";
divNotification.style.left = document.body.scrollLeft + "px";
divNotification.style.display = "block";
setTimeout(function () {divNotification.style.display = "none";},10000);
}
function checkComment () {
if (!oXmlHttp) {
oXmlHttp = zXmlHttp.createRequest();
} else if (oXmlHttp.readyState != 0 ) {
oXmlHttp.abort();
}
oXmlHttp.open("GET","ajax_checkcomment.php",true);
oXmlHttp.onreadystatechange = function () {
if(oXmlHttp.readyState == 4) {
if(oXmlHttp.status == 200) {
var arrInfo = oXmlHttp.responseText.split("||");
//lastCommentId = arrInfo[0];
if (arrInfo[0] != lastCommentId) {
if (lastCommentId != -1) {
showNotification(arrInfo[1],arrInfo[2],arrInfo[3]);
}
lastCommentId = arrInfo[0];
}
setTimeout(checkComment,interval);
}
}
};
oXmlHttp.send(null);
}
window.onload = function () {
if (1) {
checkComment();
}
};