错误如下所示：

 ERROR  Failed to compile with 1 error                                                                                                                                                                     下午11:40:17

 error  in ./src/components/ProductParam.vue?vue&type=script&lang=js&

Module not found: Error: Can't resolve 'process' in 'E:\mooc\vueMallsystem\mimall\src\components'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
        - add a fallback 'resolve.fallback: { "process": require.resolve("process/browser") }'
        - install 'process'
If you don't want to include a polyfill, you can use an empty module like this:
        resolve.fallback: { "process": false }

检查下来是因为 webpack 5 以前的版本包含 polyfills。错误信息也给出了这个原因。
解决办法：

安装依赖

npm install path-browserify

vue.config.js中配置

const NodePolyfillPlugin = require("node-polyfill-webpack-plugin")

configureWebpack:  {
    resolve: {
      fallback: {
        fs: false,
        crypto: require.resolve("crypto-browserify")
      }
    },
    plugins: [new NodePolyfillPlugin()],
  },