[]GlowFilter和TimeLine/Tween一起用的问题

目标是实现一个物体的外发光闪动效果，demo如下，是直接从官方的glowfilter的demo改动过来的，执行以后没有效果
(function()
{
var Sprite     = Laya.Sprite;
var Stage      = Laya.Stage;
var GlowFilter = Laya.GlowFilter;
var Texture    = Laya.Texture;
var Browser    = Laya.Browser;
var Handler    = Laya.Handler;
var WebGL      = Laya.WebGL;
var Tween   = Laya.Tween;
    var Ease    = Laya.Ease;
    var HitArea = Laya.HitArea;
    var TimeLine = Laya.TimeLine;
 
var apePath = "../../res/apes/monkey2.png";
 
var ape;
 
var splashSp = function(sp){
        var glowFilter = new GlowFilter("#ffff00", 1, 0, 0);
        sp.filters = [glowFilter];
        var t = new TimeLine();
        for(var i = 0; i < 5; i++){
            t.to(glowFilter, {blur: 10}, 200, null, 0);
            t.to(glowFilter, {blur: 1}, 200, null, 0);
        }
        t.on(Event.COMPLETE, this, function(){
            sp.filters = null;
        });
        t.play(0, true);
    };
 
(function()
{
// 不支持WebGL时自动切换至Canvas
Laya.init(Browser.clientWidth, Browser.clientHeight, WebGL);
 
Laya.stage.alignV = Stage.ALIGN_MIDDLE;
Laya.stage.alignH = Stage.ALIGN_CENTER;
 
Laya.stage.scaleMode = "showall";
Laya.stage.bgColor = "#232628";
 
Laya.loader.load(apePath, Handler.create(this, setup));
})();
 
function setup()
{
createApe();
applayFilter();
}
 
function createApe()
{
ape = new Sprite();
ape.loadImage(apePath);
 
var texture = Laya.loader.getRes(apePath);
ape.x = (Laya.stage.width - texture.width) / 2;
ape.y = (Laya.stage.height - texture.height) / 2;
 
Laya.stage.addChild(ape);
}
 
function applayFilter()
{
//创建一个发光滤镜
//var glowFilter = new GlowFilter("#ffff00", 10, 0, 0);
//设置滤镜集合为发光滤镜
//ape.filters = [glowFilter];
splashSp(ape);
}
})();