fs包已安装，报错如下：

fs in ./~/_vue-server-renderer@2.5.16@vue-server-renderer/build.js, ./~/_resolve@1.7.1@resolve/lib/sync.js and 10 others

 To install it, you can run: npm install --save fs




解决方案：如果在webpack.base.conf.js没有配置node，可以试试配置一下

        将以下代码加到 webpack.dev.conf.js 中：

node: {

    // prevent webpack from injecting useless setImmediate polyfill because Vue
    // source contains it (although only uses it if it‘s native).
    setImmediate: false,
    // prevent webpack from injecting mocks to Node native modules
    // that does not make sense for the client
    dgram: ‘empty‘,
    fs: ‘empty‘,
    net: ‘empty‘,
    tls: ‘empty‘,
    child_process: ‘empty‘
}