new jsb.Manifest参数问题

let storagePath = ${jsb.fileUtils.getWritablePath()}test;
let am = new jsb.AssetsManager(’’, storagePath);
let obj = {
remoteManifestUrl: ‘http://xxx/a.manifest’,
assets: {}
};
let str = JSON.stringify(obj);
let manifest = new jsb.Manifest(str, storagePath);
am.loadLocalManifest(manifest, storagePath);
am.update();

请问下，new jsb.Manifest和loadLocalManifest的第2个参数的作用？

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