Ajax Post传值和Get传值实例

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<html xmlns="http://www.111cn.net/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>ajax post传值和get传值实例</title>
<script language="网页特效">
function posttext()
{
    var chatbox = document.getelementbyid( "utext" );
    var chat = chatbox.value;
 var getuser ='admin';
 var getuserid ='1';
    chatbox.value = "";
       
    var url = ajaxserverpagename+"?active=addtext&user=" + getuser + "&userid=" + getuserid + "&text=" + chat;
   
    var req = getajax();
   
    req.onreadystatechange = function(){
   
        if( req.readystate == 4 && req.status == 200 ) {
            req=null;
            updateall();
        }
   
    }
   
    req.open( 'get', url, true );
    req.send( null );
    url=null;
    chat=null;
    chatbox=null;
}
</script>
</head>

<body>
<form id="form1" name="form1" method="post" action="">
  <p>
    <label for="utext"></label>
    <textarea name="utext" id="utext" cols="45" rows="5"></textarea>
  </p>
  <p>
    <input type="submit" name="button" id="button" value="提交" />
  </p>
</form>
</body>
</html>