flex冒泡事件问题处理
问题：点击第三级元素，结果一二级元素也影响了！解决方案：
事件监听时需要多设置一个参数false,而true意味着事件在所有过程传递也是默认的值。
p0.addEventListener(MouseEvent.CLICK, p0_clickHandler, false); 每个事件都需要防止冒泡
event.stopPropagation(); 所有代码如下：
<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" creationComplete="application1_creationCompleteHandler(event)" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"><fx:Script><!]></fx:Script><fx:Declarations><!-- Place non-visual elements (e.g., services, value objects) here --></fx:Declarations><s:Panel id="p0" width="900" height="600" title="一级"><s:layout><s:HorizontalLayout/></s:layout><s:Panel id="p1" width="600" height="300" title="二级"><s:layout><s:HorizontalLayout/></s:layout><s:Panel title="三级" id="p2" width="300" height="150"><s:Button id="btn2" click="btn2_clickHandler(event)" label="btn2"/></s:Panel><s:Button id="btn1" click="btn1_clickHandler(event)" label="btn1"/></s:Panel><s:Button id="btn0" click="btn0_clickHandler(event)" label="btn0"/></s:Panel></s:Application>
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