flex 使用 embed 设置背景及 滤镜的设置方法

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="init()" width="605" height="376" backgroundImage="{bg}">
    <mx:Script>
        <![CDATA[
            [Bindable]
            [Embed(source="/assets/srcImg.jpg")]
            private var bg:Class;
            
            [Bindable]
            private var filter:DropShadowFilter = new DropShadowFilter(5,5);
            
            private function init():void{
                
                label1.setStyle("fontSize",50);
            }
            
        ]]>
    </mx:Script>
    <mx:Label id="label1" x="35" y="79" text="Label" filters="{[filter]}"/>
</mx:WindowedApplication>