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升级步骤：https://jike.info/topic/49663/
结果发现 NodeBB版本 > 4.3不再支持 MongoDB 4.0 了！
最少得 MongoDB 4.2！
这次升级没有备份原的所有代码，然后就翻车了！
代码强退到 4.2.2版本，安装依赖 启动服务！
哈哈哈
