正确的写法：
override protected function _onEnable():void {
for (var i = 0, n = this._controllerLayers.length; i < n; i++) {
if (this._controllerLayers[i].playOnWake) {
var controllerLayer = this._controllerLayers[i];
var curPlayState = controllerLayer._currentPlayState;
if (curPlayState == null) {
var defaultClip = this.getDefaultState(i);
(defaultClip) && (this.play(null, i, 0));
}
}
}
}
