第一种方式

安装插件 npm install babel-plugin-transform-remove-console --save-dev

在 babel.config.js 文件中添加配置 transform-remove-console

module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset'
  ],
  plugins: ['transform-remove-console'],

  sourceType: 'unambiguous'
}

只在生产模式下删除console.log

let pluginsT = []
if (process.env.NODE_ENV === "production") {   
  plugins.push("transform-remove-console");
}
module.exports = {
   ...
    plugins:['..',...pluginsT ]
   ...
}

完整代码

let plugins = [[
  'import',
  {
    libraryName: 'vant',
    libraryDirectory: 'es',
    style: (name) => `${name}/style/less`
  },
  'vant'
]];
if (process.env.NODE_ENV === "production") {   
  plugins.push("transform-remove-console");
}
module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset'
  ],
  plugins: plugins,
  // common + es6 共存
  sourceType: 'unambiguous'
}

第二种方式

找到 build / webpack.prod.conf.js
在build下面的webpack.prod.conf.js里面找到这里添加上

drop_console: true,
pure_funcs: ['console.log']

完整代码

plugins: [
    ...
    new UglifyJsPlugin({
      uglifyOptions: {
        compress: {
          warnings: false,
          drop_console: true,
          pure_funcs: ['console.log']
        }
      },
      sourceMap: config.build.productionSourceMap,
      parallel: true
    })
...