flex 滤镜

flex常用滤镜：
1.GlowFilter(color, alpha, blurX, blurY, strength, quality, _inner, knockout) 发光滤镜
2，DropShadowFilter(distance, angle, color, alpha, blurX, blurY, strength, quality, inner, knockout) 投影滤镜
3，BlurFilter(blurX, blurY, BitmapFilterQuality.HIGH) 柔化滤镜
4，new ColorMatrixFilter([0.3086, 0.6094, 0.0820, 0, 0,0.3086, 0.6094, 0.0820, 0, 0,0.3086, 0.6094, 0.0820, 0, 0,0, 0, 0, 1, 0])置灰滤镜 不可用时置灰