ActionScript3:如果您单击的对象是那种类型的对象,您如何比较

代码如下:

var newBlok:Boolean;
var blokIndex:int = 0;
var blokje:blok;
var huidigBlok:DisplayObject;
var prullenBak:DisplayObject = getChildByName("groen_mc");

stage.addEventListener(MouseEvent.MOUSE_DOWN,pickUp);
stage.addEventListener(MouseEvent.MOUSE_UP,dropIt);

function pickUp(event:MouseEvent):void
{
    trace(event.currentTarget);
    trace(event.target);
    trace(event.target.name);

    if (event.target.name == "mc1_mc")
    {
        trace("hoi");

        blokje = new blok;  
        blokje.name = "blokje" + blokIndex;
        blokIndex++;

        addChild(blokje);
        blokje.startDrag(true);

    }

    if (event.target.type == blok)
    {
        trace("blok");
    }

    //blokjeVast = blokje;
}

function dropIt(event:MouseEvent):void
{
    event.target.stopDrag();
}

即使我点击的对象给出:

[object Stage]
[object blok]
blokje0

为了线路。

trace(event.currentTarget);
trace(event.target);
trace(event.target.name);

有人知道如何检查它是否是“blok”类型的对象吗?