[LayaAir 2.0]动画加载完成的监听是怎样写？

let fly = Laya.Pool.getItemByCreateFun("fly", this.fly, this);
owner.addChild(fly);
fly.play(0, true, "ani1");
 
fly() {
let ani = new Laya.Animation();
ani.loadAnimation("plaen4.ani");
return ani;
}
 
这样写是可以正常播放，但是会有这个警告 ani not found: plaen4.ani#ani1