flash as3获得舞台的显示对象

代码如下：

testDisplayObject(stage);

function testDisplayObject(doc:DisplayObjectContainer) 
{        
    if (doc.numChildren) 
    {
        trace("当前对象",doc,"名字",doc.name,"下有",doc.numChildren,"个子显示对象\n");
        for (var j:int=0; j<doc.numChildren; j++) 
        {
             trace("分别是 ",j,":",doc.getChildAt(j),"\t名字是:",doc.getChildAt(j).name);
        }
        trace("\n\n\n");
        for (var k:int=0; k<doc.numChildren; k++) 
        {         
             arguments.callee(doc.getChildAt(k));
        }
    } 
    else 
    {
        trace("当前对象",doc,"名字",doc.name,"下没有子显示对象了");
        }
}