如何从unity 2018中的Asset Bundle加载场景

using System.Collections;
using UnityEngine;
using UnityEngine.SceneManagement;

public class LoadSceneFromAssetBundle : MonoBehaviour
{
    public string assetBundlePath = "file://" + Application.streamingAssetsPath + "/your_asset_bundle_name";
    public string sceneName = "YourSceneName";

    void Start()
    {
        StartCoroutine(LoadScene());
    }

    IEnumerator LoadScene()
    {
        using (WWW www = new WWW(assetBundlePath))
        {
            yield return www;

            AssetBundle assetBundle = www.assetBundle;
            if (assetBundle == null)
            {
                Debug.LogError("Failed to load AssetBundle!");
                yield break;
            }

            SceneAsset sceneAsset = assetBundle.LoadAsset<SceneAsset>(sceneName);
            if (sceneAsset == null)
            {
                Debug.LogError("Failed to load scene from AssetBundle!");
                yield break;
            }

            SceneManager.LoadScene(sceneAsset.name);
        }
    }
}