利用BlendMode做镂空擦除效果

import flash.display.BlendMode;

import flash.events.MouseEvent;

import flash.display.Shape;

var bg:Sprite = new Sprite;

bg.graphics.beginFill(0xffcc00);

bg.graphics.drawRect(0, 0, this.stage.stageWidth, this.stage.stageHeight);

bg.graphics.endFill();

bg.blendMode = BlendMode.LAYER;

this.addChild(bg);

bg.addEventListener(MouseEvent.CLICK,onClick);

 

//var child:Shape = new Shape;

var box:Sprite = new Sprite;

box.graphics.beginFill(0xffcc00);

box.graphics.drawRect(100, 100, 200, 200);

box.graphics.endFill();

box.blendMode = BlendMode.ERASE;

bg.addChild(box);

box.addEventListener(MouseEvent.CLICK,onClickchild);

function onClick(e:MouseEvent):void

{

trace("bg");

}

function onClickchild(e:MouseEvent):void

{

trace("box");

}