mscrm4.0 获取当前登录的用户名

var xml = "" + "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
"<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">" +
"  <soap:Body>" +
"    <query xmlns:q1=\"http://schemas.microsoft.com/crm/2006/Query\" xsi:type=\"q1:QueryExpression\" xmlns=\"http://schemas.microsoft.com/crm/2006/WebServices\">" +
"      <q1:EntityName>systemuser</q1:EntityName>" +
"      <q1:ColumnSet xsi:type=\"q1:ColumnSet\">" +
"        <q1:Attributes>" +
"          <q1:Attribute>systemuserid</q1:Attribute>" +
"          <q1:Attribute>fullname</q1:Attribute>" +
"        </q1:Attributes>" +
"      </q1:ColumnSet>" +
"      <q1:Distinct>false</q1:Distinct>" +
"      <q1:Criteria>" +
"        <q1:FilterOperator>And</q1:FilterOperator>" +
"        <q1:Conditions>" +
"          <q1:Condition>" +
"            <q1:AttributeName>systemuserid</q1:AttributeName>" +
"            <q1:Operator>EqualUserId</q1:Operator>" +
"          </q1:Condition>" +
"        </q1:Conditions>" +
"      </q1:Criteria>" +
"    </query>" +
"  </soap:Body>" +
"</soap:Envelope>" +"";

var xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");

xmlHttpRequest.Open("POST", "/mscrmservices/2006/CrmService.asmx", false);
xmlHttpRequest.setRequestHeader("SOAPAction","http://schemas.microsoft.com/crm/2006/WebServices/RetrieveMultiple");
xmlHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
xmlHttpRequest.setRequestHeader("Content-Length", xml.length);
xmlHttpRequest.send(xml);

var doc = xmlHttpRequest.responseXML;
var user = doc.selectSingleNode("//BusinessEntity");

var userId = user.selectSingleNode("systemuserid").text;
alert(userId);

var userName = user.selectSingleNode("fullname").text;
alert(userName);