Uncaught ReferenceError: development is not defined vue运行webpack.dev报错

Uncaught ReferenceError: development is not defined vue.esm.js?efeb:370

原因是webpack在配置开发环境的时候没有加双引号

  plugins: [
    new webpack.DefinePlugin({
      // 错误的配置'process.env': { NODE_ENV: 'development' }
      'process.env': { NODE_ENV: '"development"' }   // 正确的配置
    }),
   ]