用mpvue开发小程序，页面突然报错:

This dependency was not found:* fs in ./node_modules/destroy/index.js, ./node_modules/etag/index.js

重新安装npm install --save fs   也不行，最后网上找到解决办法：

1. 找到build文件下的 webpack.base.conf.js
2. 在如下图位置：

上述代码：

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"
  },

 重启项目，就成功了！