[LayaAir 2.0]MovieClip卸载不掉，有内存泄漏

destroyItemsMovie() {
let n: number = 25;
while (--n > 0) {
let mov0 = this["item" + n] as MovieClip;
if (mov0) {
mov0.visible && (mov0.visible = false);
mov0.playing && mov0.stop();
mov0.parent && mov0.parent.removeChild(mov0);
mov0.destroy(true);
delete this["item" + n];
}
}
}