CocosCreator 加载Bundle里的Prefab
// "_bundleLevel"是配置好的Bundle
// "prefabs/PanelInfo"是"_bundleLevel/prefabs/PanelInfo"下的预制件
cc.assetManager.loadBundle("_bundleLevel",(err:Error,bundle:cc.AssetManager.Bundle)=>{
bundle.load("prefabs/PanelInfo",(err1:Error,prefab:cc.Prefab)=>{
cc.log(prefab);
})
});