3.8.1
当传入manifest文件时:
let url = https:/xxxx/project.manifest;
assetManager.loadRemote(url, (err, res) => {
//res.nativeAsset web端正常, native端该值等于url, 最后只能使用_file
this._am.loadRemoteManifest(new native.Manifest(res["_file"], this._storagePath));
});