引入以下扩展：（<script src="Scripts/Ext.lib.Ajax.getConnectionObject.js"></script>）

Ext.lib.Ajax.getConnectionObject = function() {
	var activeX = ['MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
	function createXhrObject(transactionId) {
		var http;
		try {
			http = new XMLHttpRequest();
		} catch (e) {
			for (var i = 0; i < activeX.length; ++i) {
				try {
					http = new ActiveXObject(activeX[i]);
					break;
				} catch (e) {
				}
			}
		} finally {
			return {
				conn : http,
				tId : transactionId
			};
		}
	}

	var o;
	try {
		if (o = createXhrObject(Ext.lib.Ajax.transactionId)) {
			Ext.lib.Ajax.transactionId++;
		}
	} catch (e) {
	} finally {
		return o;
	}
};

Ext.onReady(function() {

			var conn = Ext.lib.Ajax.getConnectionObject().conn;
			conn.open("POST", 'data_request', false);

			var param = {
				name : 'wzp',
				age : 28
			};
			conn.send(Ext.encode(param));
			alert(conn.responseText);
		});