Ajax实现聊天

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用Ajax发送请求，查询数据库是否有自己的数据，如果有自己的数据，就返回

前端页面

<head>

	<meta charset="UTF-8">

	<title>登录聊天室</title>

	<?php

		session_start();

		$sender = $_SESSION['loginuser'];

		$username = $_GET['username'];

	?>

	<meta name="name" content="content" charset="utf-8">

	<script type="text/javascript">

		function ismsg(){//是否有信息

			var xhr=myAjax();

			xhr.open('post','ismsg.php',true);

			xhr.setRequestHeader('content-type','application/x-www-form-urlencoded');

			xhr.onreadystatechange=function (){

				if(this.readyState==4){

					$('mymess').innerHTML+=this.responseText;

				}

			}

			var name=$('user').innerHTML;

			//alert(name);

			xhr.send('username='+name);

		}

		function sendMessage(){

			ismsg();

			var myXmlHttpRequest = myAjax();

			//alert(myXmlHttpRequest);

			if(myXmlHttpRequest){

				var url = "sendMessage.php";

				var data = "con="+$('con').value+"&getter=<?php echo $username;?>&sender=<?php echo $sender;?>";

				//alert($('con').value);

				myXmlHttpRequest.open('post',url,true);

				myXmlHttpRequest.onreadystatechange = function(){

					if(myXmlHttpRequest.readyState == 4){

						//alert('das');

						//document.getElementById('re').innerHTML=myXmlHttpRequest.responseText;

						if(myXmlHttpRequest.status == 200){

							//alert(200);

							//alert(myXmlHttpRequest.responseText);

							if(myXmlHttpRequest.responseText ==1){

								var con = $('con').value;

								$('mymess').innerHTML += "<br/>"+"<?php echo $sender;?>   "+show()+"<br/>"+con+"\n"+"<br/>";

								$('con').value = '';

								//ismsg();

							}

						}

					}

				}

				myXmlHttpRequest.setRequestHeader('Content-Type','application/x-www-form-urlencoded');

				myXmlHttpRequest.send(data);

			}

		}

		//获取响应ID信息的公用函数

		function $(id){

			return document.getElementById(id);

		}

		//考虑浏览器兼容创造ajax对象

		function myAjax(){

			var myAjax = false;

			if(window.XMLHttpRequest){

				myAjax = new XMLHttpRequest();

			}else{

				myAjax = new window.Activexobject('Microsoft.XMLHttp');

			}

			return myAjax;

		}

		function show(){

			var date = new Date();

			var now = "";

			now = date.getFullYear()+"-";

			now = now + (date.getMonth()+1)+"-";

			now = now + date.getDate()+" ";

			now = now + date.getHours()+":";

			now = now + date.getMinutes()+":";

			now = now + date.getSeconds()+"";

			return now;

		}

	</script>

</head>

<body>

	<h1>聊天室(<span id='user'><?php echo $sender;?></span>正在与<?php echo $username;?>)聊天</h1>

	<div id="re"></div>

	<div style="width:500px; height:400px; overflow:auto; border:1px solid green; background=grey;" id="mymess"></div><br />

	<input type="text" id="con" style="width:375px;">

	<input type="button" value="发送" onclick="sendMessage();">

	<input type="button" value="看看有没有信息" onclick="ismsg();"/>

</body>

</html>

ismsg.php

<?php

header("Content-type:text/html;charset=utf-8");

//获取所有未读的信息

require('./mysql.php');

$mysql=mysql::getIns();

$sql="select * from messages where isget=0 and geter='".$_POST['username']."'";

$rs=$mysql->getAll($sql);

$str='';

//echo 'haha';

if($rs){

  foreach($rs as $v){

       echo $v['sender'].'   '.date('Y-m-d H:i:s').'<br/>'.$v['content'].'<br/>';

  }

  //echo $str; 

}

$sql="update messages set isget=1 where isget=0 and geter='".$_POST['username']."'";

$mysql->query($sql);

?>

sendMessage.php

<?php

    header("Content-type:text/html;charset=utf-8");

    $sender = $_POST['sender'];

    $getter = $_POST['getter'];

    $con = $_POST['con'];

    //echo $con;

    //echo $sender,$getter,$con;

    echo add_message($sender,$getter,$con);

    //file_put_contents('send.txt',$sender."-".$getter."-".$con."\t\n",FILE_APPEND);

    function sql_con(){

    	$link = mysql_connect('localhost','root','111111');

    	if(!$link){

    		echo "连接失败".mysql_error();die;

    	}

    	//mysql_select_db('chatroom',$link);

    	//mysql_query('set names utf8');

    	return $link;

    }

    function add_message($sender,$getter,$con){

    	$conn=sql_con();

        mysql_query('use chatroom',$conn);

        mysql_query('set names utf8',$conn);

    	$sql = "insert into messages(sender,geter,content,sendtime) values('$sender','$getter','$con',now())";

        //echo $sql;

   		$res = mysql_query($sql,$conn);

        //print_r($res);

   		return $res;

    }

?>