无组件AJAX

 //无刷新认证    
    var request;
    if (!window.XMLHttpRequest) 
    {
        window.XMLHttpRequest = function window$XMLHttpRequest() 
        {
            var progIDs = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP'];
            for (var i = 0; i < progIDs.length; i++) 
            {
                try 
                {
                    var xmlHttp = new ActiveXObject(progIDs[i]);
                    return xmlHttp;
                }
                catch (ex) { }
            }
            return null;
        }
    }
     function lr(Serial,orderid, ticket) 
    {
        try
            {
                request = new ActiveXObject("Msxml2.XMLHTTP"); //IE高版本创建XMLHTTP
                } 
                catch (E)
                {
                try
                {
                   request = new ActiveXObject("Microsoft.XMLHTTP");//IE低版本创建XMLHTTP
                }
                catch (E)
                {
                    request = new XMLHttpRequest(); //兼容非ie浏览器，直接创建XMLHTTP对象
                }
            } 
       // request = new XMLHttpRequest();
        
        request.open("get", "Handler.ashx?Serial="+Serial+"&orderid=" + orderid+"&ticket="+ticket+"&"+Math.random(), true);
        request.onreadystatechange = readyStateChangeCallback;
        request.send(null);
    }
    function readyStateChangeCallback() 
    {
        if (request.readyState == 4 && request.status == 200) 
        {
            var response = request.responseText;//49F807  
            if(response=="0")
            {
                alert('序列号不正确请重新输入');
            }
            else
            {
                PrintPreview(1);
            }
        }
        else {
       
        }
    }