总结一下asset bundle的相关知识：

1.通过脚本创建：BuildPipeLine.BuildAssetBundle、BuildPipeline.BuildScreamedSceneAssetBundle、BuildAssetBundleExplictAssetNames

2.www类下载assetbundle

var www:WWW = new WWW(url);

yield www;

render.material.mainTexture=www.mainAsset;

或者

var www=WWW.loadFromCacheOrDownload("http://")

yield www;

www.assetbundle.mainasset

3.从流中创建assetbundle

www=WWW(url)

yield return www;

byte[] data=www.bytes;

assetbundle = AssetBundle.createfromMemory(data)

4.从assetbundle中加载具体的asset

assetbundle.load  / loadasync /loadall

或者

application.loadLevel /loadLevelAsync / loadLevelAddtive

5.实例化assetbundle

www = new WWW（URL）

yield www;

Instantiate(www.assetbundle.mainAsset)

6.释放

assetbundle.destory / unload(true/false) / unloadUnusedAssets

//////////////高级/////////////////////////////////////////////////////////////////////////

7.assets之间的依赖

BulidPipeline.PushAssetDependencies  / PopAssetDependencies

8.Editor与runtime之间共享数据

切分场景为不同的assetBundles,划分场景的信息单独放在一个assetbundles钟，先加载划分信息

list<Object> toinclude = new 

string stringHolderPath = "assets/scriptabel.asset"

stringHolder content = ScriptableObject.CreateInstance<string>();

UnityEditor.AssetDatabase.CreateAsset(content,stringholderpath);

toinclude.add(UnityEditor.assetDatabase.loadAssetAtPath(stringholder,typeof(stringholder)));

BuildPipeline.bulidAssetBundle(null,toinclude,toarray,testAssetBundlePath);