hot-update/packages/update-manager/templates/pre_main.js

window.beforeBoot = function () {
    // console.log("游戏正在启动中.")
    if (window.remoteUrl) {
        const settings = window._CCSettings;
        settings.server = window.remoteUrl;
        //cc.log("远程资源地址:", settings.server);
    }
    let url = window.updateUrl || false;
    if (!url) {
        cc.log("未配置版本更新地址,跳过更新.")
        window.boot();
        return;
    }

    // 请求缓存信息,判断是否需要更新.
    let assetStr = window.localStorage.getItem('cur_ver_info');
    if (!assetStr) {
        window.boot();
    } else {
        // console.log("当前版本信息:", assetStr);
        let asset = JSON.parse(assetStr);
        window.mergeVersion(asset);
        window.boot();
    }
};
window.mergeVersion = function (updateInfo) {
    const settings = window._CCSettings;
    const bundleVers = updateInfo.bundles;
    settings.server = updateInfo.server;
    if (bundleVers) {
        for (let b in bundleVers) {
            if (bundleVers[b] != settings.bundleVers[b]) {
                // 配置中的bundleVer版本不一致,则添加到remote列表中去,以供远程加载.
                if (settings.remoteBundles.indexOf(b) < 0) {
                    settings.remoteBundles.push(b);
                    console.log('bundle 有更新:', b, bundleVers[b]);
                }
            }
        }
        settings.bundleVers = bundleVers;
    }
};