骨骼动画中指定的资源对象为 dragonBones.DragonBonesAsset和 dragonBones.DragonBonesAtlasAsset，如何在代码中创建这两类对象，求大神指点。
if (dragonBonesAssets[i] instanceof dragonBones.DragonBonesAsset) {
armatureDisplay.dragonAsset = dragonBonesAssets[i];
}
if (dragonBonesAssets[i] instanceof dragonBones.DragonBonesAtlasAsset) {
armatureDisplay.dragonAtlasAsset = dragonBonesAssets[i];
}