getElementsByTagName问题求解
<html><br />
<head><br />
<br />
<?php<br />
$username=$_GET['username'];<br />
$username=trim($username);//去掉空格<br />
session_start();<br />
$loginuser=$_SESSION['loginuser'];<br />
?><br />
<br />
<meta http-equiv="content-type" content="text/html;charset=utf-8"/><br />
<script src="my.js"></script><br />
<script><br />
window.resizeTo(500,400);<br />
<br />
<br />
window.setInterval("getMessage()",5000);<br />
<br />
function getMessage(){ <br />
var myXmlHttpRequest=getXmlHttpObject();<br />
if(myXmlHttpRequest){ <br />
var url="GetMessageControl.php";<br />
var data="getter=<?php echo $loginuser; ?>&sender=<?php echo $username; ?>";<br />
myXmlHttpRequest.open("post",url,true);<br />
myXmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");<br />
//重点。指定处理结果的 函数<br />
myXmlHttpRequest.onreadystatechange=function (){<br />
if(myXmlHttpRequest.readyState==4){<br />
if(myXmlHttpRequest.status==200){<br />
var mesRes=myXmlHttpRequest.responseXML;<br />
var cons=mesRes.getElementsByTagName("con");<br />
var sendTimes=mesRes.getElementsByTagName("sendTime");<br />
window.alert(cons.length);<br />
if(cons.length!=0){<br />
for(var i=0;i<cons.length;i++){<br />
$('mycons').value+="<?php echo $username; ?>对<?php echo $loginuser; ?>说："+cons[i].childNodes[0].nodeValue+" "+sendTimes[i].childNodes[0].nodeValue; <br />
<br />
}<br />
}<br />
}<br />
}<br />
<br />
}<br />
myXmlHttpRequest.send(data);<br />
<br />
<br />
}<br />
<br />
}<br />
<br />
<br />
<br />
function sendMessage(){<br />
var myXmlHttpRequest=getXmlHttpObject();<br />
<br />
if(myXmlHttpRequest){<br />
var url="SendMessageControl.php";<br />
//js中使用php数据<br />
var data="con="+$('con').value+"&getter=<?php echo $username; ?>&sender=<?php echo $loginuser; ?>";<br />
window.alert(data);<br />
<br />
myXmlHttpRequest.open("post",url,true);<br />
myXmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");<br />
myXmlHttpRequest.onreadystatechange=function (){<br />
if(myXmlHttpRequest.readyState==4){<br />
if(myXmlHttpRequest.status==200){<br />
<br />
}<br />
}<br />
<br />
}<br />
myXmlHttpRequest.send(data);<br />
}<br />
<br />
}<br />
</script><br />
</head><br />
<br />
<br />
<br />
<center><br />
<h1>聊天室（您正在和<font color="red"><?php echo $username; ?></font>聊天）</h1><br />
<textarea cols="30" rows="10" id="mycons"></textarea><br><br />
<input type="text" style="width:200px" id="con"><br />
<input type="button" value="send" onclick="sendMessage()"><br />
<br />
<br />
<br />
</center><br />
<br />
</html><br />
<?php <br />
include 'SqlHelper.class.php';<br>
<br>
<br>
class MessageService{<br>
//将数据信息添加到数据库<br>
function addMessage($sender,$getter,$con){<br>
$sql="insert into message (sender,getter,content,sendTime) values('$sender','$getter','$con',now())";<br>
<br>
// file_put_contents("d:/test.txt","sql=".$sql."\r\n",FILE_APPEND); <br>
<br>
$sqlHelper=new SqlHelper();<br>
return $sqlHelper->execute_dml($sql);<br>
<br>
<br>
<br>
}<br>
//获取信息，并把数据组装好返回给客户端（聊天室）<br>
function getMessage($getter,$sender){<br>
$sql="select * from message where getter='$getter' and sender='$sender' and isGet=0";<br>
<br>
<br>
$sqlHelper=new SqlHelper(); <div class="clear">
</div>
