var sayHello:String = "Oh ye!";   btn1.addEventListener(MouseEvent.CLICK,function (e:MouseEvent){clickHandlerWithArg(e,sayHello)});   function clickHandlerWithArg(e:MouseEvent,arg:String):void   {   var out:String= e.target + "发出事件(有参数) :" + arg;   trace(out);   }  

var arg=0;
a.addEventListener(MouseEvent.CLICK,clickfunc(arg));
function clickfunc(arg):Function{
        var func=function(e):void{
                trace(arg);
                trace(e);
        }
        return func;
}