.buildArmature替换后显示的是旧的？？

Creator 2.x
#1

Creator 1.9.1，目标平台 Web

A,B两个角色都有dragonBone,表情attack, A的slot head换了表情后，destory了，创建B角色，B角色换表情显示的还是A的表情。

initCannon: function() {
	var cannon = cc.instantiate(info.prefab);
	if (!this._oldGun)
		this._oldGun = cc.find("UI/Panel-Gun/Gun/GunIcon", this.node)
	this._oldGun.destroy();
	this._oldGun = cannon;
	var dp = cannon.getComponent(dragonBones.ArmatureDisplay);  
	var armature = dp.buildArmature("attack");
	if(dp.armature().getSlot('head')){
		dp.armature().getSlot('head').childArmature = armature;
	}
}
#4

解决了。不能用dp.buildArmature, 改成
var armature = dp._factory.buildArmature("attack", dp._dragonBonesData.name);