要在代码中创建一个反转蒙版，请执行以下操作：

 private function createInvertedMask（mcToBeMasked：MovieClip）：void {

 mcToBeMasked.blendMode = BlendMode.LAYER; 
 var invertedMask：Sprite = new Sprite（）; 
 invertedMask.graphics.beginFill（0x0,1）; 
 invertedMask.graphics.drawRect（640，395，630，395）; 
 invertedMask.blendMode = BlendMode.ERASE; 
 mcToBeMasked.addChild（invertedMask）; 





在Flash Professional IDE中创建反转蒙版
选择选择Display - >Blending - >Layer
然后选择你的蒙版，并选择Display  - >Blending - >Erase
你会看到这样的：
I've been looking for a simple way to invert a mask in flash. Its just amazing how it doesn't have this feature.

I just really need to paint shape and whatever is below (in layers) wont show up.

Any suggestions? 
To create an inverted mask in code do the following
private function createInvertedMask(mcToBeMasked:MovieClip):void {

        mcToBeMasked.blendMode = BlendMode.LAYER;
        var invertedMask:Sprite = new Sprite();
        invertedMask.graphics.beginFill(0x0, 1);
        invertedMask.graphics.drawRect(640, 395, 630, 395);
        invertedMask.blendMode = BlendMode.ERASE;
        mcToBeMasked.addChild(invertedMask);
    }
To create an inverted mask in the Flash Professional IDE 
Choose the properties panel of the image you want masked, select "Display" -> "Blending" -> "Layer"
Then select your mask, and choose "Display -> "Blending" -> "Erase"
You'll see something like this: