string path ="file://"+ Application.streamingAssetsPath + "\\windows\\123";

  string _path = "file://" +

                Application.streamingAssetsPath + "\\windows\\ziyuab";

     using (WWW www = new WWW(path))

     {

         yield return www;

         using (WWW Xww = new WWW(_path))

         {

             yield return Xww;

             if (www != null && Xww != null)

             {

                 AssetBundle ab = www.assetBundle;

                 AssetBundle et=  Xww.assetBundle;

                 if (ab != null)

                 {

                     GameObject tempObj = ab.LoadAsset<GameObject>("Cube");

                     Instantiate(tempObj);

                 }

             }

             else

             {

                 Debug.Log("下载不成功!");

             }

         }

     }

   string ABPath;

   public string ABName;

   string bpath;

   List<AssetBundle> aBlist;

 void WanZheng()

     {

         aBlist=new List<AssetBundle>();

         ABPath = Application.streamingAssetsPath + "\\windows\\";

         bpath = Application.streamingAssetsPath + "/windows/windows";//依赖关系资源读取总路径

         Yilai(bpath);//判断物体是否有依赖,有就加载出来,没有就不加载

 #region 加载预制体,并实例化

         AssetBundle _ab = AssetBundle.LoadFromFile(ABPath+ABName);//在此处_ab已将依赖加载出来了

         GameObject obj = _ab.LoadAsset<GameObject>("Cube");

         Instantiate(obj);

 #endregion

 #region 释放内存

         foreach (AssetBundle item in aBlist)

         {

             item.Unload(false);//清除依赖内存

         }

        _ab.Unload(true);//清除物体本身内存

        AssetBundle _ab01 = AssetBundle.LoadFromFile(ABPath + ABName);//在此处_ab已将依赖加载出来了

        GameObject obj01 = _ab01.LoadAsset<GameObject>("Cube");

         Instantiate(obj01,Vector3.one,Quaternion.identity);

 #endregion

     }

 void Yilai(string bpath)

     {

         AssetBundle yilaiAB = AssetBundle.LoadFromFile(bpath);//读取依赖

         AssetBundleManifest manifest

             = yilaiAB.LoadAsset<AssetBundleManifest>("AssetBundleManifest");//读取依赖关系列表

         string[] depndencies = manifest.GetAllDependencies(ABName);//按照名字加载名字旗下的依赖关系

         //将依赖放入列表并加载出来

         if (depndencies.Length!=)

         {

             foreach (string s in depndencies)

             {

                 aBlist.Add(loadDepndenciesByList(ABPath,s));

             }

         }

     }

  private AssetBundle loadDepndenciesByList(string ABpath,string name) //加载依赖文件,按列表里的名字

     {

         return AssetBundle.LoadFromFile(ABpath+name);

     }