ajax为什么保存为html文件调试没有问题，asp文件就有问题》向达人请教

这个页面为什么保存为main.html调试没有问题。而保存为asp文件格式的调试的时候说运行没有权限。
希望达人给予解决。
感谢直至，
贴出代码：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>xmlhttprequest ajax demo</title>
    <script type ="text/javascript" language ="javascript" >
        var req; 
        function creatReq() 
        {
            var url="http://127.0.0.1/geturl/leftpart/inf.asp"; 
            if(window.XMLHttpRequest) //IExmlhttprequest
            {
                req=new XMLHttpRequest();
            }
            else if(window.ActiveXObject) //IEactivexobject
            {
                req=new ActiveXObject("Microsoft.XMLHttp");
            }
            
            if(req)
            {
                req.open("GET",url,true); 
                req.onreadystatechange=callback; 
                req.send(null); //
            }
        }
        
        function callback() 
        {
            if(req.readystate==4) 
            {
                if(req.status==200) 
                {
                    Dispaly(); 
                }
                else 
                {
                    alert(req.statusText);
                }
            }
            else
            {
                document.getElementById("myTime").innerHTML="数据加载中";
            }
        }
        
        function Dispaly() 
        {
            document.write(req.responseText);
        }
    </script>
</head>
<body>
    <div id="myTime"></div>
        
    <input id="Button1" type="button" value="GetTime"  onclick="creatReq();"/>
</body>
</html>