var myRequest:URLRequest = new URLRequest("http://www.webstudio.com.cn/msg.php");
var myLoader:URLLoader = new URLLoader();
var myVariables:URLVariables = new URLVariables();

myLoader.addEventListener(Event.COMPLETE, loadSuccessful);
myLoader.addEventListener(IOErrorEvent.IO_ERROR, loadError);

myVariables.var1 = "hello";
myVariables.var2 = "hi";

myRequest.method = URLRequestMethod.POST;
myRequest.data = myVariables;

myLoader.load(myRequest);

function loadSuccessful($evt:Event):void
{

trace("参数已发送");
}

function loadError($evt:IOErrorEvent):void
{

trace("发送失败.");
}