npm install uglifyjs-webpack-plugin -D
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

configureWebpack: config => {
    if (isProduction) {
      config.plugins = config.plugins.concat(
        [
          new UglifyJsPlugin({
            uglifyOptions: {
              compress: {
                warnings: false,
                drop_debugger: true,
                drop_console: true,
              },
            },
            sourceMap: false,
            parallel: true,
          })

        ]
      )
    }

⠧ Building for production...

 ERROR Failed to compile with 1 errors                                                     上午10:10:12

 error

assets/js/about.e1f1ea37.js from UglifyJs
Unexpected token: keyword (const) [assets/js/about.e1f1ea37.js:13062,0]

 ERROR Build failed with errors.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! thua@0.1.0 build: `vue-cli-service build --mode production`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the thua@0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!   /Users/chenya/.npm/_logs/2019-01-15T02_10_12_281Z-debug.log

transpileDependencies

Type: Array<string | RegExp>

Default: []

transpileDependencies: [
    'vue-particles',
    'animejs'
  ],