Ajax

<html>
    <head>
        <title>test</title>
    </head>
    <body>
        <script type='text/javascript'>
            function createXMLHttpRequest(){
                var xmlHttpRequest = null; //XMLHttpRequest Object
                if (window.XMLHttpRequest) {
                    xmlHttpRequest = new XMLHttpRequest();
                }
                else
                    if (window.ActiveXObject) {
                        xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP"); // Internet Explorer 5.5+
                    }
                    else {
                        return false;
                    }
                return xmlHttpRequest;
            }

            function postRequest(url, parameters){
                var xmlHttpRequest;
                xmlHttpRequest = createXMLHttpRequest();
                if (!xmlHttpRequest) {
                    alert('Cannot create XMLHTTPRequest instance');
                    return false;
                }
                xmlHttpRequest.onreadystatechange = responseResult(xmlHttpRequest);
                xmlHttpRequest.open('POST', url); // varAsync[optional] default is : true
                xmlHttpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
                xmlHttpRequest.setRequestHeader("Content-length", parameters.length);
                //http_request.setRequestHeader("Connection", "close");
                xmlHttpRequest.send(parameters);
            }

            function responseResult(xmlHttpRequest){
                var result;
                if (xmlHttpRequest.readyState == 4) {
                    if (xmlHttpRequest.status == 200) { // 200 == OK
                        result = xmlHttpRequest.responseText;
                    }
                    else {
                        alert('There was a problem with the request.');
                    }
                }
            }

            //postRequest('http://www.baidu.com', '');
        </script>
    </body>
</html>

posted on 2010-11-30 12:36 houchengli 阅读(114) 评论(0) 编辑收藏举报