1.首先我们把这段代码拷贝下来，放进工程，不要托给任何物体，就放在那不要理它。

using UnityEngine; using UnityEditor; public class ExportAssetBundles {     [MenuItem("Export/Build AssetBundle From Selection - Track dependencies")]     static void ExportResource () {         // Bring up save panel         string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource", "unity3d");         if (path.Length != 0) {             // Build the resource file from the active selection.         Object[] selection = Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets);             BuildPipeline.BuildAssetBundle(Selection.activeObject, selection, path, BuildAssetBundleOptions.CollectDependencies | BuildAssetBundleOptions.CompleteAssets);             Selection.objects = selection;         }     }     [MenuItem("Export/Build AssetBundle From Selection - No dependency tracking")]     static void ExportResourceNoTrack () {         // Bring up save panel         string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource", "unity3d");         if (path.Length != 0) {             // Build the resource file from the active selection.             BuildPipeline.BuildAssetBundle(Selection.activeObject, Selection.objects, path);         }     } }

当我们创建完，保存好后我，我们会发现菜单的导航栏多了这2项

2.我们在选中我们需要打包的预设物体（也即是Prefab）。然后选中上面的第一项进行打包成.unity3d格式的文件。如图

3.设置名字，路径等（路径很重要，待会加载会用到。）如图:

4.刷新下。你就会看见这个了:

这个就是我们打包后动态加载的内容。

5. 现在我来说下怎么动态加载它吧,直接上代码

using UnityEngine; using System.Collections; using System.IO;  public class LoadUnity3d : MonoBehaviour {      // Use this for initialization     void Start()     {          StartCoroutine(LoadScene());      }      // Update is called once per frame     void Update()     {      }      IEnumerator LoadScene()     {         //文件路径，也就是我们打包的那个         WWW www = new WWW("file:///" + Application.dataPath + "/Bundles/My Prefab.unity3d");         yield return www;         Instantiate(www.assetBundle.mainAsset);     } }

6.我们再新建一个空物体，讲我们这个脚本托给他，运行，你就能看见我们的预设也加载出来了。

  效果如下: