/*@post data to server*/
private function postData(src:String ,data:String ,callBack:Function):void
{
    var header1:URLRequestHeader = new URLRequestHeader("Content-Type" ,"application/json;charset=utf-8");
    var header2:URLRequestHeader = new URLRequestHeader("Accept" ,"application/json");

    var request:URLRequest = new URLRequest(src);
    request.data = data;
    request.method = URLRequestMethod.POST;
    request.requestHeaders = [header1 ,header2];
    
    var loader:URLLoader = new URLLoader();
    loader.dataFormat = URLLoaderDataFormat.TEXT;
    loader.addEventListener(Event.COMPLETE,
    function():void{
        callBack(loader.data);  
    });
    loader.load(request);
    
}

/*@get data from server*/
private function getData(src:String ,callBack:Function):void
{
    var header1:URLRequestHeader = new URLRequestHeader("Content-Type" ,"application/json;charset=utf-8");
    var header2:URLRequestHeader = new URLRequestHeader("Accept" ,"application/json");

    var request:URLRequest = new URLRequest(src);
    request.method = URLRequestMethod.GET;
    request.requestHeaders = [header1 ,header2];
    
    var loader:URLLoader = new URLLoader();
    loader.dataFormat = URLLoaderDataFormat.TEXT;
    loader.addEventListener(Event.COMPLETE,
    function():void{
        callBack(loader.data);  
    });
    loader.load(request);
    
}