AJAX-get或post数据

1：POST

try {
                var xmlhttp = new XMLHttpRequest();
                }
                catch (e) {
                    var xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
                }
                xmlhttp.open("POST", "AjaxUpdate.aspx", false);
                xmlhttp.setRequestHeader("Content-Type", "text/html");
                xmlhttp.send(result);
                if (xmlhttp.readyState != 4 && xmlhttp.status != 200)
                    xmlhttp.statusText;
                else
                    xmlhttp.responseText;

 

2：GET

try {
                    var xmlhttp = new XMLHttpRequest();
                    }
                    catch (e) {
                        var xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
                    }
                    //escape对string做编码以免乱码
                    xmlhttp.open('get', 'XXXX.aspx?username=' +escape(document.getElementById('TextBox_UserNamer').value), true);
                    xmlhttp.onreadystatechange = function() {
                        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                            document.getElementById('Checker').innerHTML = xmlhttp.responseText;
                        }
                    }
                    xmlhttp.send();