魔战士

Jack's conclusions

• When a component is added to the stage (i.e., added to any container in the stage's display list), an added event will be dispatched for this component, followed by an addedToStage event. Next, if this component is a container, it's descendants will fire addedToStage in branch-to-leaf order.
   
• When a component is removed from the stage (i.e., removed from any container in the stage's display list), a removed event will be dispatched for this component, followed by an removedFromStage event. Next, if this component is a container, it's descendants will fire removedFromStage in branch-to-leaf order.
   
• Occasionally, a component's skin may fire added/removed events for the component. You might need to check the event target.