AS3坑爹的Sprite

Sprite居然没有removeAllChildren(),removeAllListeners()这样的方法，这让多少程序内存泄露。后来的starling明显人性化了

removeChildren(beginIndex:int = 0, endIndex:int = -1, dispose:Boolean = false):void

Removes a range of children from the container (endIndex included).

removeEventListeners(type:String = null):void

Removes all event listeners with a certain type, or all of them if type is null.

Sprite居然带了个graphics对象，有时候我们仅仅需要一个单纯的容器，而Sprite却硬塞给你一个画笔对象，这让我很费解。

var a:Sprite = new Sprite();
var b:Sprite = new Sprite();
trace(a.graphics==b.graphics)

输出为false;