一，添加热更新需要的文件

1. 在项目根目录添加 version_generator.js 文件

/**
 * 此模块用于热更新工程清单文件的生成
 */

var fs = require('fs');
var path = require('path');
var crypto = require('crypto');

var manifest = {
    //服务器上资源文件存放路径（src，res的路径）
    packageUrl: 'http://192.168.200.117:8000/XiaoMing/remote-assets/',
    //服务器上project.manifest路径
    remoteManifestUrl: 'http://192.168.200.117:8000/XiaoMing/remote-assets/project.manifest',
    //服务器上version.manifest路径
    remoteVersionUrl: 'http://192.168.200.117:8000/XiaoMing/remote-assets/version.manifest',
    version: '1.0.0',
    assets: {},
    searchPaths: []
};

//生成的manifest文件存放目录
var dest = 'assets/';
//项目构建后资源的目录
var src = 'build/jsb-link/';

/**
 * node version_generator.js -v 1.0.0 -u http://your-server-address/tutorial-hot-update/remote-assets/ -s native/package/ -d assets/
 */
// Parse arguments
var i = 2;
while ( i < process.argv.length) {
    var arg = process.argv[i];

    switch (arg) {
    case '--url' :
    case '-u' :
        var url = process.argv[i+1];
        manifest.packageUrl = url;
        manifest.remoteManifestUrl = url + 'project.manifest';
        manifest.remoteVersionUrl = url + 'version.manifest';
        i += 2;
        break;
    case '--version' :
    case '-v' :
        manifest.version = process.argv[i+1];
        i += 2;
        break;
    case '--src' :
    case '-s' :
        src = process.argv[i+1];
        i += 2;
        break;
    case '--dest' :
    case '-d' :
        dest = process.argv[i+1];
        i += 2;
        break;
    default :
        i++;
        break;
    }
}


function readDir (dir, obj) {
    var stat = fs.statSync(dir);
    if (!stat.isDirectory()) {
        return;
    }
    var subpaths = fs.readdirSync(dir), subpath, size, md5, compressed, relative;
    for (var i = 0; i < subpaths.length; ++i) {
        if (subpaths[i][0] === '.') {
            continue;
        }
        subpath = path.join(dir, subpaths[i]);
        stat = fs.statSync(subpath);
        if (stat.isDirectory()) {
            readDir(subpath, obj);
        }
        else if (stat.isFile()) {
            // Size in Bytes
            size = stat['size'];
            md5 = crypto.createHash('md5').update(fs.readFileSync(subpath, 'binary')).digest('hex');
            compressed = path.extname(subpath).toLowerCase() === '.zip';

            relative = path.relative(src, subpath);
            relative = relative.replace(/\\/g, '/');
            relative = encodeURI(relative);
            obj[relative] = {
                'size' : size,
                'md5' : md5
            };
            if (compressed) {
                obj[relative].compressed = true;
            }
        }
    }
}

var mkdirSync = function (path) {
    try {
        fs.mkdirSync(path);
    } catch(e) {
        if ( e.code != 'EEXIST' ) throw e;
    }
}

// Iterate res and src folder
readDir(path.join(src, 'src'), manifest.assets);
readDir(path.join(src, 'res'), manifest.assets);

var destManifest = path.join(dest, 'project.manifest');
var destVersion = path.join(dest, 'version.manifest');

mkdirSync(dest);

fs.writeFile(destManifest, JSON.stringify(manifest), (err) => {
  if (err) throw err;
  console.log('Manifest successfully generated');
});

delete manifest.assets;
delete manifest.searchPaths;
fs.writeFile(destVersion, JSON.stringify(manifest), (err) => {
  if (err) throw err;
  console.log('Version successfully generated');
});

  注意：以下几个地方，你可能需要根据自己的需求修改，本文 第三节第一点 会指出各个参数对应的情况。

2. 添加热更新组件，并挂在热更新脚本

image.png

HotUpdate.js
/**
 * 负责热更新逻辑的组件
 */
cc.Class({
    extends: cc.Component,

    properties: {
        manifestUrl: cc.RawAsset,  //本地project.manifest资源清单文件
        _updating: false,
        _canRetry: false,
        _storagePath: ''
    },

    checkCb: function (event) {
        cc.log('Code: ' + event.getEventCode());
        switch (event.getEventCode()) {
            case jsb.EventAssetsManager.ERROR_NO_LOCAL_MANIFEST:
                cc.log("No local manifest file found, hot update skipped.");
                break;
            case jsb.EventAssetsManager.ERROR_DOWNLOAD_MANIFEST:
            case jsb.EventAssetsManager.ERROR_PARSE_MANIFEST:
                cc.log("Fail to download manifest file, hot update skipped.");
                break;
            case jsb.EventAssetsManager.ALREADY_UP_TO_DATE:
                cc.log("Already up to date with the latest remote version.");
                break;
            case jsb.EventAssetsManager.NEW_VERSION_FOUND:
                cc.log('New version found, please try to update.');
                this.hotUpdate();
                break;
            default:
                return;
        }

        cc.eventManager.removeListener(this._checkListener);
        this._checkListener = null;
        this._updating = false;
    },

    updateCb: function (event) {
        var needRestart = false;
        var failed = false;
        switch (event.getEventCode()) {
            case jsb.EventAssetsManager.ERROR_NO_LOCAL_MANIFEST:
                cc.log('No local manifest file found, hot update skipped...');
                failed = true;
                break;
            case jsb.EventAssetsManager.UPDATE_PROGRESSION:
                cc.log(event.getPercent());
                cc.log(event.getPercentByFile());
                cc.log(event.getDownloadedFiles() + ' / ' + event.getTotalFiles());
                cc.log(event.getDownloadedBytes() + ' / ' + event.getTotalBytes());

                var msg = event.getMessage();
                if (msg) {
                    cc.log('Updated file: ' + msg);
                }
                break;
            case jsb.EventAssetsManager.ERROR_DOWNLOAD_MANIFEST:
            case jsb.EventAssetsManager.ERROR_PARSE_MANIFEST:
                cc.log('Fail to download manifest file, hot update skipped.');
                failed = true;
                break;
            case jsb.EventAssetsManager.ALREADY_UP_TO_DATE:
                cc.log('Already up to date with the latest remote version.');
                failed = true;
                break;
            case jsb.EventAssetsManager.UPDATE_FINISHED:
                cc.log('Update finished. ' + event.getMessage());
                needRestart = true;
                break;
            case jsb.EventAssetsManager.UPDATE_FAILED:
                cc.log('Update failed. ' + event.getMessage());
                this._updating = false;
                this._canRetry = true;
                break;
            case jsb.EventAssetsManager.ERROR_UPDATING:
                cc.log('Asset update error: ' + event.getAssetId() + ', ' + event.getMessage());
                break;
            case jsb.EventAssetsManager.ERROR_DECOMPRESS:
                cc.log(event.getMessage());
                break;
            default:
                break;
        }

        if (failed) {
            cc.eventManager.removeListener(this._updateListener);
            this._updateListener = null;
            this._updating = false;
        }

        if (needRestart) {
            cc.eventManager.removeListener(this._updateListener);
            this._updateListener = null;
            // Prepend the manifest's search path
            var searchPaths = jsb.fileUtils.getSearchPaths();
            var newPaths = this._am.getLocalManifest().getSearchPaths();
            cc.log(JSON.stringify(newPaths));
            Array.prototype.unshift(searchPaths, newPaths);
            // This value will be retrieved and appended to the default search path during game startup,
            // please refer to samples/js-tests/main.js for detailed usage.
            // !!! Re-add the search paths in main.js is very important, otherwise, new scripts won't take effect.
            cc.sys.localStorage.setItem('HotUpdateSearchPaths', JSON.stringify(searchPaths));
            jsb.fileUtils.setSearchPaths(searchPaths);

            cc.audioEngine.stopAll();
            cc.game.restart();
        }
    },


    retry: function () {
        if (!this._updating && this._canRetry) {
            this._canRetry = false;

            cc.log('Retry failed Assets...');
            this._am.downloadFailedAssets();
        }
    },

    checkForUpdate: function () {
        cc.log("start checking...");
        if (this._updating) {
            cc.log('Checking or updating ...');
            return;
        }
        if (this._am.getState() === jsb.AssetsManager.State.UNINITED) {
            this._am.loadLocalManifest(this.manifestUrl);
            cc.log(this.manifestUrl);
        }
        if (!this._am.getLocalManifest() || !this._am.getLocalManifest().isLoaded()) {
            cc.log('Failed to load local manifest ...');
            return;
        }
        this._checkListener = new jsb.EventListenerAssetsManager(this._am, this.checkCb.bind(this));
        cc.eventManager.addListener(this._checkListener, 1);
        
        this._am.checkUpdate();

        this._updating = true;
    },

    hotUpdate: function () {
        if (this._am) {
            this._updateListener = new jsb.EventListenerAssetsManager(this._am, this.updateCb.bind(this));
            cc.eventManager.addListener(this._updateListener, 1);

            if (this._am.getState() === jsb.AssetsManager.State.UNINITED) {
                this._am.loadLocalManifest(this.manifestUrl);
            }

            this._failCount = 0;
            this._am.update();
            this._updating = true;
        }
    },

    show: function () {
        // if (this.updateUI.active === false) {
        //     this.updateUI.active = true;
        // }
    },

    // use this for initialization
    onLoad: function () {
        // Hot update is only available in Native build
        if (!cc.sys.isNative) {
            return;
        }
        this._storagePath = ((jsb.fileUtils ? jsb.fileUtils.getWritablePath() : '/') + 'xiaoming-remote-asset');
        cc.log('Storage path for remote asset : ' + this._storagePath);

        // Setup your own version compare handler, versionA and B is versions in string
        // if the return value greater than 0, versionA is greater than B,
        // if the return value equals 0, versionA equals to B,
        // if the return value smaller than 0, versionA is smaller than B.
        this.versionCompareHandle = function (versionA, versionB) {
            cc.log("JS Custom Version Compare: version A is " + versionA + ', version B is ' + versionB);
            var vA = versionA.split('.');
            var vB = versionB.split('.');
            for (var i = 0; i < vA.length; ++i) {
                var a = parseInt(vA[i]);
                var b = parseInt(vB[i] || 0);
                if (a === b) {
                    continue;
                }
                else {
                    return a - b;
                }
            }
            if (vB.length > vA.length) {
                return -1;
            }
            else {
                return 0;
            }
        };

        // Init with empty manifest url for testing custom manifest
        this._am = new jsb.AssetsManager('', this._storagePath, this.versionCompareHandle);
        if (!cc.sys.ENABLE_GC_FOR_NATIVE_OBJECTS) {
            this._am.retain();
        }
        // Setup the verification callback, but we don't have md5 check function yet, so only print some message
        // Return true if the verification passed, otherwise return false
        this._am.setVerifyCallback(function (path, asset) {
            // When asset is compressed, we don't need to check its md5, because zip file have been deleted.
            var compressed = asset.compressed;
            // Retrieve the correct md5 value.
            var expectedMD5 = asset.md5;
            // asset.path is relative path and path is absolute.
            var relativePath = asset.path;
            // The size of asset file, but this value could be absent.
            var size = asset.size;
            if (compressed) {
                cc.log("Verification passed : " + relativePath);
                return true;
            }
            else {
                cc.log("Verification passed : " + relativePath + ' (' + expectedMD5 + ')');
                return true;
            }
        });
        cc.log("Hot update is ready, please check or directly update.");

        if (cc.sys.os === cc.sys.OS_ANDROID) {
            // Some Android device may slow down the download process when concurrent tasks is too much.
            // The value may not be accurate, please do more test and find what's most suitable for your game.
            this._am.setMaxConcurrentTask(2);
            cc.log("Max concurrent tasks count have been limited to 2");
        }
        // this.checkUpdate();
    },

    onDestroy: function () {
        if (this._updateListener) {
            cc.eventManager.removeListener(this._updateListener);
            this._updateListener = null;
        }
        if (this._am && !cc.sys.ENABLE_GC_FOR_NATIVE_OBJECTS) {
            this._am.release();
        }
    }
});

3. 添加点击事件

4. 构建项目，生成原生资源文件

注意： 我们选择的模板是 "default" ，发布路径为 "./build" ，发布后的项目资源相对路径为：build/jsb-default

5. 修改main.js(可省略)

 2018/08/23测试发现，构建项目生成的main.js中，已包含判断，不用修改，也可以成功

根据官方文档提示，每次构建项目后，都需要修改main.js，那我们就直接复制官方demo根目录main.js的内容覆盖原有内容。

  main.js 内容如下：

main.js

(function () {

    if (window.cc && cc.sys.isNative) {
        var hotUpdateSearchPaths = cc.sys.localStorage.getItem('HotUpdateSearchPaths');
        if (hotUpdateSearchPaths) {
            jsb.fileUtils.setSearchPaths(JSON.parse(hotUpdateSearchPaths));
        }
    }

    'use strict';

    function boot () {

        var settings = window._CCSettings;
        window._CCSettings = undefined;

        if ( !settings.debug ) {
            // retrieve minified raw assets
            var rawAssets = settings.rawAssets;
            var assetTypes = settings.assetTypes;
            for (var mount in rawAssets) {
                var entries = rawAssets[mount];
                for (var uuid in entries) {
                    var entry = entries[uuid];
                    var type = entry[1];
                    if (typeof type === 'number') {
                        entry[1] = assetTypes[type];
                    }
                }
            }
        }

        // init engine
        var canvas;

        if (cc.sys.isBrowser) {
            canvas = document.getElementById('GameCanvas');
        }

        function setLoadingDisplay () {
            // Loading splash scene
            var splash = document.getElementById('splash');
            var progressBar = splash.querySelector('.progress-bar span');
            cc.loader.onProgress = function (completedCount, totalCount, item) {
                var percent = 100 * completedCount / totalCount;
                if (progressBar) {
                    progressBar.style.width = percent.toFixed(2) + '%';
                }
            };
            splash.style.display = 'block';
            progressBar.style.width = '0%';

            cc.director.once(cc.Director.EVENT_AFTER_SCENE_LAUNCH, function () {
                splash.style.display = 'none';
            });
        }

        var onStart = function () {
            cc.view.resizeWithBrowserSize(true);
            // UC browser on many android devices have performance issue with retina display
            if (cc.sys.os !== cc.sys.OS_ANDROID || cc.sys.browserType !== cc.sys.BROWSER_TYPE_UC) {
                cc.view.enableRetina(true);
            }
            //cc.view.setDesignResolutionSize(settings.designWidth, settings.designHeight, cc.ResolutionPolicy.SHOW_ALL);

            if (cc.sys.isBrowser) {
                setLoadingDisplay();
            }

            if (cc.sys.isMobile) {
                if (settings.orientation === 'landscape') {
                    cc.view.setOrientation(cc.macro.ORIENTATION_LANDSCAPE);
                }
                else if (settings.orientation === 'portrait') {
                    cc.view.setOrientation(cc.macro.ORIENTATION_PORTRAIT);
                }
                // qq, wechat, baidu
                cc.view.enableAutoFullScreen(
                    cc.sys.browserType !== cc.sys.BROWSER_TYPE_BAIDU &&
                    cc.sys.browserType !== cc.sys.BROWSER_TYPE_WECHAT &&
                    cc.sys.browserType !== cc.sys.BROWSER_TYPE_MOBILE_QQ
                );
            }

            // init assets
            cc.AssetLibrary.init({
                libraryPath: 'res/import',
                rawAssetsBase: 'res/raw-',
                rawAssets: settings.rawAssets,
                packedAssets: settings.packedAssets
            });

            var launchScene = settings.launchScene;

            // load scene
            if (cc.runtime) {
                cc.director.setRuntimeLaunchScene(launchScene);
            }
            cc.director.loadScene(launchScene, null,
                function () {
                    if (cc.sys.isBrowser) {
                        // show canvas
                        canvas.style.visibility = '';
                        var div = document.getElementById('GameDiv');
                        if (div) {
                            div.style.backgroundImage = '';
                        }
                    }
                    cc.loader.onProgress = null;

                    // play game
                    // cc.game.resume();

                    console.log('Success to load scene: ' + launchScene);
                }
            );
        };

        // jsList
        var jsList = settings.jsList;
        var bundledScript = settings.debug ? 'project.dev.js' : 'project.js';
        if (jsList) {
            jsList.push(bundledScript);
        }
        else {
            jsList = [bundledScript];
        }

        // anysdk scripts
        if (cc.sys.isNative && cc.sys.isMobile) {
            jsList = jsList.concat(['jsb_anysdk.js', 'jsb_anysdk_constants.js']);
        }

        jsList = jsList.map(function (x) { return 'src/' + x; });

        var option = {
            //width: width,
            //height: height,
            id: 'GameCanvas',
            scenes: settings.scenes,
            debugMode: settings.debug ? cc.DebugMode.INFO : cc.DebugMode.ERROR,
            showFPS: settings.debug,
            frameRate: 60,
            jsList: jsList,
            groupList: settings.groupList,
            collisionMatrix: settings.collisionMatrix,
            renderMode: 0
        };

        cc.game.run(option, onStart);
    }

    if (window.document) {
        var splash = document.getElementById('splash');
        splash.style.display = 'block';

        var cocos2d = document.createElement('script');
        cocos2d.async = true;
        cocos2d.src = window._CCSettings.debug ? 'cocos2d-js.js' : 'cocos2d-js-min.js';

        var engineLoaded = function () {
            document.body.removeChild(cocos2d);
            cocos2d.removeEventListener('load', engineLoaded, false);
            boot();
        };
        cocos2d.addEventListener('load', engineLoaded, false);
        document.body.appendChild(cocos2d);
    }
    else if (window.jsb) {
        require('src/settings.js');
        require('src/jsb_polyfill.js');

        boot();
    }

})();

二，服务器搭建(仅局域网内可访问)

1. 编写服务器脚本

server.py

import SimpleHTTPServer
import SocketServer

PORT = 8000

Handler = SimpleHTTPServer.SimpleHTTPRequestHandler

httpd = SocketServer.TCPServer(("", PORT), Handler)

print "serving at port", PORT
httpd.serve_forever()

2. 启动服务

  打开命令行
  切换目录到 server.py 所在目录下
  输入下方命令，启动服务：

python -m server 8000

  详细参见官方文档给出的地址：https://docs.python.org/2/library/simplehttpserver.html

三，生成旧版清单文件

1. 修改version_generator.js

packageUrl：服务器存放资源文件(src res)的路径
remoteManifestUrl：服务器存放资源清单文件(project.manifest)的路径
remoteVersionUrl：服务器存放version.manifest的路径
dest：要生成的manifest文件存放路径
src：项目构建后的资源目录

2. 根据构建后的资源目录，执行version_generator.js，生成manifest清单文件

  打开cmd，切换到当前项目根目录下，执行下方命令：

//官方给出的命令格式
>node version_generator.js -v 1.0.0 -u http://your-server-address/tutorial-hot-update/remote-assets/ -s native/package/ -d assets/

//我的命令
>node version_generator.js -v 1.0.0 -u http://192.168.200.117:8000/HotUpdate/ -s build/jsb-default/ -d assets

//由于我们version_generator文件中，都配置好了参数
//因此可以简单调用以下命令即可
>node version_generator.js

• -v： 指定 Manifest 文件的主版本号。
• -u： 指定服务器远程包的地址，这个地址需要和最初发布版本中 Manifest 文件的远程包地址一致，否则无法检测到更新。
• -s： 本地原生打包版本的目录相对路径。
• -d： 保存 Manifest 文件的地址。

PS：如果version_generator.js中的配置都正确，特别是版本号，可以直接执行 node version_generator.js。

3. 并绑定到热更新脚本上

  如果指定的Manifest文件生成的目录不在assets下，则需将project.manifest复制到assets目录下

4. 打包旧版本

  构建项目->编译
  在真机上运行build/jsb-default/simulator目录下的apk
  1.0.0版本运行如下：

三，生成新版本

1. 更改代码，更改version_generator.js中的版本号

2. 构建项目 && 重新生成资源清单文件

  构建项目：此步骤和生成旧版本中一样，这里就不截图啦。
  重新生成资源清单文件：修改version_generator.js中的版本号后，可以直接调用以下命令：

>node version_generator.js

3. 将manifest文件以及src，res拷贝到服务器

4. 运行旧版本

  运行结果，点击 检测更新 后，很快app重启，logo变成了head.png。
  成功！

由于这里检测到新版本后，就开始自动更新。

你可以修改这部分逻辑，检测到有新版后，弹窗提示是否需要更新。

后面再继续研究 大厅+子游戏的模式，以及不重启加载子游戏方案...