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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script language="javascript">
<!—创建XMLHttpRequest对象-->
var xmlHttp = false;
if(window.ActiveXObject)
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
else if(window.XMLHttpRequest)
xmlHttp=new XMLHttpRequest();
<!—发送请求 -->
function checkUser() {
var userName = document.getElementById("userName").value;
var url = "CheckUserName?userName=" + userName;
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatePage;
xmlHttp.send(null);
}
<!—返回结果处理 -- >
function updatePage() {
if (xmlHttp.readyState == 4){
if(xmlHttp.status==200){
var response = xmlHttp.responseText;
var result="此帐号可以使用！";
if(response.indexOf("true")!=-1) result="很遗憾，该帐号已经被占用，请您另选一个";
document.getElementById("result").innerHTML=result;
}
}
}
</script>
</head>
<body>
<br>
<form id="regForm" action="" >
<table border="0" align="center" width=400>
<tbody>
<tr><th colspan="2">新用户注册</th></tr>
<tr class="zi9pt">
<td bgcolor="" align="right">帐号：</td>
<td><input type="text" value="" id="userName" name="userName" onblur="checkUser()"/></td>
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