Actionscript 3 删除Actionscript 3中的EventListeners

我有一个函数，我想在其中删除一个

EventListener

，但它给出了以下错误：

Access of undefined property event

以下是相关代码：

dr_line.addEventListener(MouseEvent.CLICK,drawln);
var test:Boolean;

function drawln(e:MouseEvent):void{
    event.currentTarget.removeEventListener(MouseEvent.CLICK, drawln);
    stage.addEventListener(MouseEvent.CLICK,click1);    
}

var sx,sy,fx,fy,j:int;

function click1(e:MouseEvent):void{
    sx=mouseX;
    sy=mouseY;
    stage.addEventListener(MouseEvent.CLICK,click2);
}

function click2(e:MouseEvent):void{
    var i:int;
    i=1;
    trace(i);
    fx=mouseX;
    fy=mouseY;
    var  line:Shape = new Shape();
    line.graphics.beginFill(0x00FF00);
    line.graphics.moveTo(sx,sy);
    line.graphics.lineTo(fx,fy);
    this.addChild(line);
}

我尝试过在

click1

和

click2

中删除事件侦听器，但仍然不起作用

---

我做错了什么？

事件未声明；e是。尝试更改此选项：

function drawln(e:MouseEvent):void{
    event.currentTarget.removeEventListener(MouseEvent.CLICK, drawln);
    stage.addEventListener(MouseEvent.CLICK,click1);    
}

为此：

function drawln(e:MouseEvent):void{
    e.currentTarget.removeEventListener(MouseEvent.CLICK, drawln);
    stage.addEventListener(MouseEvent.CLICK,click1);    
}

甚至可能是这样：

function drawln(e:MouseEvent):void{
    dr_line.removeEventListener(MouseEvent.CLICK, drawln);
    stage.addEventListener(MouseEvent.CLICK,click1);    
}