【AS3代码】深度的设置

package
{
    import com.ui.Ball;
    
    import flash.display.Sprite;

    public class Main extends Sprite
    {    
        var a:Ball = new Ball(0x000000,20);
        var b:Ball = new Ball(0x4c1b1b,20);
        var c:Ball = new Ball(0xf6e497,20);
        var d:Ball = new Ball(0xfcfae1,20);
        var e:Ball = new Ball(0xbd8d46,20);
        
        public function Main():void
        {
            init();
        }
        private function init():void
        {
            a.x = 100;
            a.y = 100;
            b.x = 120;
            b.y = 120;
            c.x = 140;
            c.y = 140;
            d.x = 160;
            d.y = 160;
            e.x = 180;
            e.y = 180;
            
            this.addChild(a);    //a深度0（最底层）
            this.addChild(c);    //c深度1
            this.addChild(e);    //e深度2（最上层）
            
            //设置b的深度为1后，c和e深度自动向后+1
            this.addChildAt(b,1);            
            
            trace(this.getChildIndex(a));    //a深度0
            trace(this.getChildIndex(c));    //c深度2
            trace(this.getChildIndex(e));    //e深度3
            
            this.addChild(d);
            
            //直接调换可视对象d和e的深度(调换后深度a0,b1,c2,d3,e4)
            this.swapChildren(d,e);
            
            //将倒数第一位的深度和倒数第二位深度上的可是对象对调
            this.swapChildrenAt((this.numChildren-2),(this.numChildren-1));        
            
            //将c置顶
            this.setChildIndex(c,this.numChildren-1);
            
        }
        
    }
}