AJAX_simple

<SCRIPT LANGUAGE="JavaScript">
    <!--
    function ajaxByJyking(){
        var xmlhttp_request = "";
        try {
            if (window.ActiveXObject) {
                for (var i = 5; i; i--) {
                    try {
                        if (i == 2) {
                            xmlhttp_request = new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        else {
                            xmlhttp_request = new ActiveXObject("Msxml2.XMLHTTP." + i + ".0");
                            xmlhttp_request.setRequestHeader("Content-Type", "text/xml");
                            xmlhttp_request.setRequestHeader("Charset", "gb2312");
                        }
                        break;
                    } 
                    catch (e) {
                        xmlhttp_request = false;
                    }
                }
            }
            else 
                if (window.XMLHttpRequest) {
                    xmlhttp_request = new XMLHttpRequest();
                    if (xmlhttp_request.overrideMimeType) {
                        xmlhttp_request.override.MimeType('text/xml');
                    }
                }
        } 
        catch (e) {
            xmlhttp_request = false;
        }
        
        
        xmlhttp_request.open('GET', 'http://www.yuling8.com', true);
        xmlhttp_request.send(null);
        xmlhttp_request.onreadystatechange = function(){
            if (xmlhttp_request.readyState == 4) {
                // 收到完整的服务器响应 
                document.write("yes")
            }
            else {
                alert(1)
            }
        }
    }
    
    ajaxByJyking();
    //-->
    
</SCRIPT>