getElementsByTagName有关问题求解

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Release： 2016-06-13 12:48:23

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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 />

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<?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>

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