Can I create a node and put all my display content into my node?
stage.addChild(node)
Can I put all my content into the node?
Put all the content into your own nodes
不用 Lib.current和 main（雪碧）
Because I don’t want to nest too many layers, it’s said to affect performance
No need for Lib.current and main (Sprite)
trace(this.parent.parent, 2);
Main - Sprite
Lib.current - MovieClip
stage - Stage