从嵌套子查询中选择where条件(select with a where condition from nested subquery)

 父母的Graphics总是落后于所有父母的孩子。 您应该自己创建另一个Sprite或Shape对象，将其放在显示列表的顶部，然后绘制其图形。 
 
var spectrum:Shape=new Shape();
addChild(spectrum); // if last added, will be on top
function everyFrame(e:Event):void {
     var g:Graphics=spectrum.graphics; // that's all you need to change!
     // the rest of code follows
}

The parent's Graphics is always behind all parent's children. You should make yourself another Sprite or Shape object, place it on top of your display list, and draw on its graphics instead.
 
var spectrum:Shape=new Shape();
addChild(spectrum); // if last added, will be on top
function everyFrame(e:Event):void {
     var g:Graphics=spectrum.graphics; // that's all you need to change!
     // the rest of code follows
}