打包策略和打包工具

打包策略

1. 设置编辑器工具统一设置AB包名及路径管理
2. 根据依赖关系（自定义依赖关系表）生成不冗余AB包
3. 基于Asset的全路径生成自己的依赖关系表
4. 根据自己的依赖关系加载AB包

优点：在编辑器环境下，不需要打包；不会产生冗余AB包；文件夹或文件AB包设置简单方便管理。

整个思路就是Unity自己的Addressable打包方式

缺点：长时间未打包的情况下，用于生成目录所需要的时间比较长。

为什么会产生冗余：

如果我们给一个资产文件打上一个AB包名，给包含此资产的文件夹打上另一个AB包名，那么此资产就会产生冗余

如果我们给一个图片打上一个AB包名，给依赖此图片的另一个Prefab打上另一个AB包名，又会产生冗余？？

自定义打包配置SO

基于Assets序列化生成编辑器打包配置SO，表里的设置主要分为两种：

1. 基于文件夹下所有单个prefab文件进行打包
2. 基于文件夹进行打包

ABConfig脚本

在Editor文件夹内新建ABConfig脚本

using System.Collections.Generic;
using UnityEngine;

[CreateAssetMenu(fileName = "ABConfig",menuName ="CreateABConfig")]
public class ABConfig : ScriptableObject
{
    
    // assetbundle Prefab文件所在文件夹路径，会遍历这个文件夹下所有Prefab，
    // 所有的Prefab的名字不能重复，必须保证名字的唯一性
    public List<string> m_AllPrefabPath = new List<string>();
    
    //指定一个文件夹路径并且指定此文件夹的AssetBundle名
    public List<FileDirABName> m_AllFileDirAB = new List<FileDirABName>();

    [System.Serializable]
    public struct FileDirABName
    {
        public string ABName;
        public string Path;
    }
}

这是一个简单的配置表示例，我们可以新建一个ABConfig，然后在“All Prefab Path”里填写所有Prefab文件所在文件夹的Path如：“Assets/Prefabs”；

在“All File Dir AB”里填写文件夹路径和这个文件夹所需要指定的AssetBundle名称(一般都是纯小写），如：

AB Name: shader
Path: Assets/GameData/Shaders

AB Name: sound
Path: Assets/GameData/Sounds

注意

Prefab文件夹内的各个Prefab名要保证唯一。

生成AB包

1. 根据单个Prefab文件和整个文件夹设置AB包
2. 剔除冗余AB包
3. 生成AB包配置表（xml）

修改Editor文件夹下的BundleEditor脚本：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;
using System.Xml.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

public class BundleEditor 
{
    private static string ABCONFIGPATH = "Assets/ResFrame.Editor/Editor/Resource/ABConfig.asset";
    private static string BYTEPATH = "Assets/GameData/Data/ABData/AssetBundleConfig.bytes";
    private static string m_BundleTargetPath = Application.streamingAssetsPath;
    /// <summary>
    /// key是包名，value是路径，这是一个包含所有文件夹ab包的DIc
    /// </summary>
    private static Dictionary<string, string> m_AllFileDic = new Dictionary<string, string>();
    /// <summary>
    /// 用于过滤，让“PrefabAB包”已经包含的“文件AB包”不参与打包
    /// </summary>
    private static List<string> m_AllFileAB = new List<string>();
    /// <summary>
    /// key是Prefab名，value是此prefab依赖的无重复打包资源列表
    /// </summary>
    private static Dictionary<string, List<string>> m_AllPrefabDic = new Dictionary<string, List<string>>();
    /// <summary>
    /// 储存所有有效路径,它存储了所有文件夹AB包的路径和Prefab（不是Prefab依赖）的路径，并且不查重
    /// </summary>
    private static List<string> m_ConfigFil = new List<string>();

    [MenuItem("Tools/Build AssetBundle")]
    public static void Build()
    {
        DataEditor.AllXmlToBinary();//所有的xml配置数据转二进制，后期配置表部分用的。
        m_AllFileAB.Clear();
        m_AllFileDic.Clear();
        m_AllPrefabDic.Clear();
        m_ConfigFil.Clear();
        ABConfig abConfig = AssetDatabase.LoadAssetAtPath<ABConfig>(ABCONFIGPATH);
        foreach (ABConfig.FileDirABName fileDir in abConfig.m_AllFileDirAB)//要先设置文件夹AB包，这样后面的Prefab的AB包才能检测到文件夹AB包
        {
            if(m_AllFileDic.ContainsKey(fileDir.ABName))
            {
                Debug.LogError("文件夹AB包名重复，请检查！");
            }
            else
            {
                m_AllFileDic.Add(fileDir.ABName, fileDir.Path);
                m_AllFileAB.Add(fileDir.Path);
                m_ConfigFil.Add(fileDir.Path);
            }
        }

        string[] allStr = AssetDatabase.FindAssets("t:Prefab", abConfig.m_AllPrefabPath.ToArray());//根据指定的类型返回GUID

        for (int i = 0; i < allStr.Length; i++)
        {
            string path = AssetDatabase.GUIDToAssetPath(allStr[i]);
            EditorUtility.DisplayProgressBar("查找用于打包的Prefab","Prefab：" + path,i*1.0f/allStr.Length);
            m_ConfigFil.Add(path);
            if (!ContainAllFileAB(path))
            {
                GameObject obj = AssetDatabase.LoadAssetAtPath<GameObject>(path);
                //获取当前Prefab的所有引用，查看这些引用是否打包成了AB
                string[] allDepend = AssetDatabase.GetDependencies(path);
                List<string> allDependPath = new List<string>();
                for (int j = 0; j < allDepend.Length; j++)
                {
                    if (!ContainAllFileAB(allDepend[j]) && !allDepend[j].EndsWith(".cs"))//因为引用中也会返回脚本，脚本是无法参与打包的，需要剔除
                    {
                        m_AllFileAB.Add(allDepend[j]);
                        allDependPath.Add(allDepend[j]);
                    }
                }
                if(m_AllPrefabDic.ContainsKey(obj.name))
                {
                    Debug.LogError("存在相同名字的Prefab：" + obj.name);
                }
                else
                {
                    m_AllPrefabDic.Add(obj.name, allDependPath);
                }
            }
        }
        foreach (string name in m_AllFileDic.Keys)
        {
            SetABName(name, m_AllFileDic[name]);//设置文件AB包的名称
        }
        foreach (string name in m_AllPrefabDic.Keys)
        {
            SetABName(name, m_AllPrefabDic[name]);//设置PrefabAB包所有依赖项的AB包名称
        }

        //到此不使用AssetDatabase.SaveAssets()和AssetDatabase.Refresh()，
        //这样相当于把文件夹重新加载重新生成meta，是不必要的，我们直接在内存中进行操作就可以
        BuildAssetBundle();

        string[] oldNames = AssetDatabase.GetAllAssetBundleNames();
        for (int i = 0; i < oldNames.Length; i++)
        {
            AssetDatabase.RemoveAssetBundleName(oldNames[i], true);
            EditorUtility.DisplayProgressBar("清除AB包名", "名字：" + oldNames[i],i*1.0f/oldNames.Length);
        }

        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
        EditorUtility.ClearProgressBar();
        
    }
    /// <summary>
    /// 设置ab包的名称
    /// </summary>
    /// <param name="name">需要设置的名称</param>
    /// <param name="path">此ab包的路径</param>
    static void SetABName(string name,string path)
    {
        AssetImporter assetImporter = AssetImporter.GetAtPath(path);
        if (assetImporter != null)
        {
            assetImporter.assetBundleName = name;
        }
        else
        {
            Debug.LogError("不存在此路径文件：" + path);
        }
    }
    /// <summary>
    /// 设置多个资源的ab包名称
    /// </summary>
    /// <param name="name">需要设置的名称</param>
    /// <param name="paths">资源路径列表</param>
    static void SetABName(string name, List<string> paths)
    {
        paths.ForEach(path =>
        {
            SetABName(name, path);
        });
    }
    /// <summary>
    /// 查找当前PrefabAB是否已经包含在文件夹AB里面
    /// </summary>
    static bool ContainAllFileAB(string path)
    {
        for (int i = 0; i < m_AllFileAB.Count; i++)
        {
            //后面的Replace是为了防止出现：
            //Assets/GameData/Test
            //Assets/GameDate/TestTT/a.prefafb
            //这样的情况，虽然后者包含前者，但是并不在同一个文件夹
            if (path == m_AllFileAB[i] || (path.Contains(m_AllFileAB[i]) && (path.Replace(m_AllFileAB[i], "")[0] == '/')))
            {
                return true;
            }
        }
        return false;
    }
    static void BuildAssetBundle()
    {
        string[] allBundles = AssetDatabase.GetAllAssetBundleNames();
        //key是各种Asset的全路径，value是AB包名
        Dictionary<string,string> resPathDic = new Dictionary<string,string>();//这一步是为了生成配置表
        for (int i = 0; i < allBundles.Length; i++)
        {
            string[] allBundlePath = AssetDatabase.GetAssetPathsFromAssetBundle(allBundles[i]);//获取到标记为此AB包名的所有资产路径
            for (int j = 0; j < allBundlePath.Length; j++)
            {
                if (allBundlePath[j].EndsWith(".cs"))
                {
                    continue;
                }
                
                resPathDic.Add(allBundlePath[j], allBundles[i]);
            }
        }

        DeleteAB();
        WriteData(resPathDic);

        BuildPipeline.BuildAssetBundles
            (
            m_BundleTargetPath,
            BuildAssetBundleOptions.ChunkBasedCompression,
            EditorUserBuildSettings.activeBuildTarget
            );

    }
    /// <summary>
    /// 根据全路径AB包字典生成配置表
    /// </summary>
    /// <param name="resPathDic">全路径AB包字典</param>
    static void WriteData(Dictionary<string, string> resPathDic)
    {
        AssetBundleConfig config = new AssetBundleConfig();
        config.ABBasesList = new List<ABBase>();
        foreach (string path in resPathDic.Keys)
        {
            if(!ValidPath(path))
            { continue; }
            ABBase aBBase = new ABBase();
            aBBase.Path = path;
            aBBase.Crc = CRC32.GetCRC32 (path);
            aBBase.ABName = resPathDic[path];
            aBBase.AssetName = Path.GetFileName (path);
            aBBase.ABDependence = new List<string>();
            string[] resDependence = AssetDatabase.GetDependencies (path);
            for (int i = 0; i < resDependence.Length; i++)
            {
                string tempPath = resDependence[i];
                if (tempPath == path || tempPath.EndsWith(".cs"))//剔除掉自己和脚本
                    continue;
                string abName = "";
                if (resPathDic.TryGetValue(tempPath, out abName))//如果此AB包的依赖已经包含在最终要打包的Dic中
                {
                    if (abName == resPathDic[path])//如果此AB包的依赖的AB包名就是它自己，剔除掉
                        continue;
                    if (!aBBase.ABDependence.Contains(abName))//如果此AB包依赖的AB包名还没有被添加进去
                    {
                        aBBase.ABDependence.Add(abName);
                    }
                }
            }
            config.ABBasesList.Add(aBBase);
        }
        //写入xml
        string xmlPath = Application.dataPath + "/AssetbundleConfig.xml";
        if(File.Exists(xmlPath)) { File.Delete(xmlPath); }
        using(FileStream fs = new FileStream(xmlPath,FileMode.Create,FileAccess.ReadWrite,FileShare.ReadWrite))
        {
            using(StreamWriter sw = new StreamWriter(fs,System.Text.Encoding.UTF8))
            {
                XmlSerializer xs = new XmlSerializer(typeof(AssetBundleConfig));
                xs.Serialize(sw, config);
            }
        }
        //写入二进制
        //资源的路径只有在xml配置表中有用，在StreamingAssets里的二进制配置文件中没有意义，只需要用CRC就好了，这里清除掉
        foreach (ABBase aBBase in config.ABBasesList)
        {
            aBBase.Path = string.Empty;
        }
        
        using (FileStream fs = new FileStream(BYTEPATH, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
        {
            BinaryFormatter bf = new BinaryFormatter();
            bf.Serialize(fs, config);
        }
        AssetDatabase.Refresh();
        SetABName("assetbundleconfig", BYTEPATH);
    }
    /// <summary>
    /// 删除已生成的AB包里面无用的AB包
    /// </summary>
    static void DeleteAB()
    {
        //如果在打包时修改了之前打包过的AB包的名字，就需要删除无用的AB包
        string[] allBundlesName = AssetDatabase.GetAllAssetBundleNames();
        DirectoryInfo directory = new DirectoryInfo(m_BundleTargetPath);
        FileInfo[] files = directory.GetFiles("*",SearchOption.AllDirectories);
        foreach (FileInfo file in files) 
        {
            if (ContainABName(file.Name, allBundlesName) || file.Name.EndsWith(".meta") || file.Name.EndsWith(".manifest") || file.Name.EndsWith("assetbundleconfig"))
            {
                continue;
            }else
            {
                Debug.Log("此AB包已经被删或者改名了，遂被删除："+file.Name);
                if (File.Exists(file.FullName))
                {
                    File.Delete(file.FullName);
                }
                if (File.Exists(file.FullName + ".manifest"))
                {
                    File.Delete(file.FullName + ".manifest");
                }
            }
        }
    }
    /// <summary>
    /// 将已经生成的AB包名和将要生成的AB包名比较
    /// </summary>
    /// <param name="name">已经生成的AB包名</param>
    /// <param name="bundleNames">将要生成的AB包名</param>
    /// <returns>将要生成的AB包是否已经存在</returns>
    static bool ContainABName(string name, string[] bundleNames)
    {
        for (int i = 0; i < bundleNames.Length; i++)
        {
            if(name == bundleNames[i])
                return true; 
        }
        return false;
    }
    /// <summary>
    /// 是否有效路径,用于剔除掉生成配置表时各种依赖的材质、贴图等的路径信息
    /// 因为这些文件并没有被设置成AB包标签
    /// </summary>
    static bool ValidPath(string path)
    {
        for (int i = 0; i < m_ConfigFil.Count; i++)
        {
            if (path.Contains(m_ConfigFil[i]))
            {
                return true;
            }
        }
        return false;
    }

}

文件夹AB包的名称需要自己指定，而PrefabAB包的名称和Prefab的名称一致

PrefabAB包的依赖项中，没有包含在“文件夹AB包”内的依赖项，会设置成和prefab同名的AB包

在DeleteAB方法中，如果一个ab包需要删除，它的meta文件我们不主动删除（可以看到我们跳过了），Unity会自动处理meta文件。尽量不手动删除它。

当我们把工程内的资源或文件夹设置了AB包名后，它们对应的meta文件会记录此设置：

fileFormatVersion: 2
guid: 656279d329887f1459f23ba220fc5467
folderAsset: yes
DefaultImporter:
  externalObjects: {}
  userData: 
  assetBundleName: shaders/*指定了此文件夹的asset bundle名*/
  assetBundleVariant: 

在实际项目中，使用SVN或GIT会同时更新每个资产对应的meta文件，当我们设置了asset bundle，同时会有大量的meta文件需要更新，但其实这是不必要的，因为我们每次打Build AB包时都会重新设置asset bundle，所以在打包完成后要清除所有的ab包的名称设置（使用AssetDatabase.RemoveAssetBundleName(oldNames[i], true);）

打包的基本顺序是：

1. 先设定文件夹AB包和不重复的PrefabAB包的AB包名称
2. 根据名称打包，并在打包过程中生成配置表
3. 删除所有AB包名，保证meta文件不修改

AssetBundleConfig

我们在Script文件夹中新建一个AssetBundleConfig类，用于在打包时生成xml配置文件和二进制配置文件

using System.Collections.Generic;
using System.Xml.Serialization;

[System.Serializable]
public class AssetBundleConfig
{
    [XmlElement("ABList")]
    public List<ABBase> ABBasesList { get; set; }
}
[System.Serializable]
public class ABBase
{
    /// <summary>
    /// 此AB包的全路径
    /// </summary>
    [XmlAttribute("Path")]
    public string Path { get; set; }
    /// <summary>
    /// 此AB包的唯一标识
    /// </summary>
    [XmlAttribute("Crc")]
    public uint Crc { get; set; }
    /// <summary>
    /// 此AB包的名字
    /// </summary>
    [XmlAttribute("ABName")]
    public string ABName { get; set; }
    /// <summary>
    /// 此AB包内部的资产名
    /// </summary>
    [XmlAttribute("AssetName")]
    public string AssetName { get; set; }
    /// <summary>
    /// 此AB包的依赖
    /// </summary>
    [XmlElement("ABDependence")]
    public List<string> ABDependence {  get; set; }
}

我们在打包的过程中生成配置文件，分为两种，一种是xml配置文件，方便在编辑器环境下查看，一种是二进制配置文件，用于传输和运行时使用。

我们在生成二进制配置文件时，将二进制配置文件生成在需要打AB包的文件夹内

private static string bytePath = "Assets/GameData/Data/ABData/AssetBundleConfig.bytes";//此为AB包文件夹        
//...
//写入二进制
        //资源的路径只有在xml配置表中有用，在StreamingAssets里的二进制配置文件中没有意义，只需要用CRC就好了，这里清除掉
        foreach (ABBase aBBase in config.ABBasesList)
        {
            aBBase.Path = string.Empty;
        }
        
        using (FileStream fs = new FileStream(bytePath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
        {
            BinaryFormatter bf = new BinaryFormatter();
            bf.Serialize(fs, config);
        }

注意，在一开始”Assets/GameData/Data/ABData/”中是没有文件的，我们需要随便加点AssetBundleConfig.bytes同名文件进去，否则Unity可能不会给空文件夹打AB包名

CRC32

我们在Script文件夹新建个CRC32类，这是一个工具类，用于生成crc，为了快速在内存中定位AB包

CRC对内存更加友好，也更加高效。所以使用CRC标记

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


public class CRC32
{
    static UInt32[] crcTable =
    {
        0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
        0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
        0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
        0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
        0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
        0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
        0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
        0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
        0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
        0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
        0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
        0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
        0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
        0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
        0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
        0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
        0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
        0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
        0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
        0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
        0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
        0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
        0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
        0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
        0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
        0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
        0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
        0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
        0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
        0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
        0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
        0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
    };

    public static uint GetCRC32(string msg)
    {
        byte[] bytes = Encoding.UTF8.GetBytes(msg);
        int iCount = bytes.Length;
        uint crc = 0xFFFFFFFF;

        for (uint i = 0; i < iCount; i++)
        {
            crc = ((crc >> 8) & 0x00FFFFFF) ^crcTable[(crc ^ bytes[i]) & 0xFF];
        }

        return crc ^ 0xffffffff;
    }
}

简单读取AB包

void TestLoadAB()
{
    //从AB包中读取二进制配置文件
    AssetBundle configAB = AssetBundle.LoadFromFile(Application.streamingAssetsPath + "/assetbundleconfig");
    TextAsset textAsset = configAB.LoadAsset<TextAsset>("AssetBundleConfig");
    using (MemoryStream ms = new MemoryStream(textAsset.bytes))
    {
        BinaryFormatter bf = new BinaryFormatter();
        //首先读取整个Asset Bundle的二进制配置文件
        AssetBundleConfig result = (AssetBundleConfig)bf.Deserialize(ms);
        //得到想要读取文件的CRC标识
        string path = "Assets/Prefabs/Attack.prefab";
        uint crc = CRC32.GetCRC32(path);
        //从Asset Bundle配置文件中获取到ABBase，二进制配置文件中只能用CRC获取ABBase
        ABBase abBase = null;
        for (int i = 0; i < result.ABBasesList.Count; i++)
        {
            if (result.ABBasesList[i].Crc == crc)
            {
                abBase = result.ABBasesList[i];
            }
        }
        for (int i = 0; i < abBase.ABDependence.Count; i++)
        {
            AssetBundle.LoadFromFile(Application.streamingAssetsPath + "/" + abBase.ABDependence[i]);
        }
        AssetBundle assetbundle = AssetBundle.LoadFromFile(Application.streamingAssetsPath + "/" + abBase.ABName);
        GameObject objPrefab = assetbundle.LoadAsset<GameObject>(abBase.AssetName);
        Instantiate(objPrefab);
    }
}