public static void BuildAllAssetBundles()
        {
            string assetBundleDirectory = "Assets/StreamingAssets/AssetBundle/" + AssetsUtility.GetPlatformName() + "/";

            //	BuildPipeline.BuildAssetBundles (assetBundleDirectory, BuildAssetBundleOptions.None, BuildTarget.StandaloneOSX);

            if (!Directory.Exists(assetBundleDirectory))
            {
                Directory.CreateDirectory(assetBundleDirectory);
            }


            //第一个参数获取的是AssetBundle存放的相对地址。
            BuildPipeline.BuildAssetBundles(
                assetBundleDirectory,
                BuildAssetBundleOptions.ChunkBasedCompression |
                BuildAssetBundleOptions.DeterministicAssetBundle | BuildAssetBundleOptions.ForceRebuildAssetBundle,
                target);

            AssetDatabase.Refresh();
            //BuildAssetBundleOptions.ForceRebuildAssetBundle
        }