1. Error occurred while packaging and compiling

2. Solution

Reason: uglifyjs only supports Es5, and element UI may introduce some writing methods of ES6, resulting in webpack packaging failure.

Scheme: use bable to parse the element UI. To complete this operation, you only need to modify the build/webpack.base.conf.js file in the front-end folder, as follows:

// Before Modify
rules: [
    {
      test: /\.js$/,
      loader: 'babel-loader',
      include: [resolve('src'), resolve('test')]
    }
]

// 修改后
rules: [
    {
      test: /\.js$/,
      loader: 'babel-loader',
        include: [resolve('src'), resolve('test'), resolve('/node_modules/element-ui/src'), resolve('/node_modules/element-ui/packages')]
    }
]

It is equivalent to adding element UI to the package that needs Babel parsing. Then execute again npm run build  success.