<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> asp+ajax檢測用戶名是否在存</title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head>
<body>
<script language="JavaScript" type="text/javascript">
<!--
function checkUserName(userName){
//建立跨浏覽器的XMLHttpRequest對象
var xmlhttp;
try{
xmlhttp= new ActiveXObject('Msxml2.XMLHTTP');
}catch(e){
try{
xmlhttp= new ActiveXObject('Microsoft.XMLHTTP');
}catch(e){
try{
xmlhttp= new XMLHttpRequest();
}catch(e){}
}
}
//創建請求,並使用escape對userName編碼,以避免亂碼
xmlhttp.open("get","checkUserName.asp?userName="+escape(userName));
xmlhttp.onreadystatechange=function(){
if(xmlhttp.readyState==4){
if(xmlhttp.status==200){
//根據responseText判斷用戶名是否存在
if(xmlhttp.responseText=="1")alert("對不起,該用戶名以存在!");
else alert("恭喜!該用戶名未被注冊!");
}else{
alert("網絡失敗。");
}
}
}
xmlhttp.send(null);
}
//-->
</script>
</body>
</html>