vue_cli3 打包去除console.log

1.npm install babel-plugin-transform-remove-console --save-dev
2.根目錄加：babel.config.js

const plugins = []
if (process.env.NODE_ENV === 'production') {
  plugins.push('transform-remove-console');
}
module.exports = {
  presets: [
    '@vue/app'
  ],
  plugins: plugins
}