文档类和stage的关系

stage是文档类的父对象

一个fla文档类里代码：

var mySprite:Shape=createRec();
var myMC:Shape=createRec(0xffcc00,40,20,4);
var myShape:Shape=createRec();
this.stage.addChild(mySprite);
this.addChild(myMC);
myMC.x=100;

this.addChild(myShape);
myShape.y=100;
//2
trace(this.parent.numChildren);
//true
trace(this.stage==this.parent);

function createRec(col:uint=0x00ff00,width:int=20,height:int=20,cornerRadius:int=5):Shape {
    var shape:Shape=new Shape();
    shape.graphics.beginFill(col);
    shape.graphics.lineStyle(1,0xff0000);
    shape.graphics.drawRoundRect(0,0,width,height,cornerRadius);
    shape.graphics.endFill();
    return shape;
}