webpack.config.js

var path = require('path');
var webpack = require('webpack');
var autoprefixer = require('autoprefixer');
var precss = require('precss');

//判断当前运行环境是开发模式还是生产模式
const nodeEnv = process.env.NODE_ENV || 'development';
const isPro = nodeEnv === 'production';

console.log("当前运行环境：", isPro)

var plugins = []
if (isPro) {
  plugins.push(
      new webpack.optimize.UglifyJsPlugin({
          compress: {
              warnings: false
          }
      }),
      new webpack.DefinePlugin({
          'process.env':{
              'NODE_ENV': JSON.stringify(nodeEnv)
          }
      })
  )
} else {
  plugins.push(
      new webpack.DefinePlugin({
          'process.env':{
              'NODE_ENV': JSON.stringify(nodeEnv)
          },
          BASE_URL: JSON.stringify('http://localhost:9009'),
      }),
      new webpack.HotModuleReplacementPlugin()
  )
}

module.exports = {
  devtool: false,
  entry: {
    app: [
      'webpack-hot-middleware/client?path=http://localhost:3011/__webpack_hmr&reload=true&noInfo=false&quiet=false',
      'babel-polyfill',
      './src/index'
    ]
  },
  output: {
    filename: '[name].js',
    path: path.join(__dirname, 'build'),
    publicPath: 'http://localhost:3011/build/',
    chunkFilename: '[name].js'
  },
  // BASE_URL是全局的api接口访问地址
  plugins,
  // alias是配置全局的路径入口名称，只要涉及到下面配置的文件路径，可以直接用定义的单个字母表示整个路径
  resolve: {
    extensions: ['.js', '.jsx', '.less', '.scss', '.css'],
    modules: [
      path.resolve(__dirname, 'node_modules'),
      path.join(__dirname, './src')
    ]
  },

  module: {
      rules: [{
          test: /\.(js|jsx)$/,
          use: ['babel-loader'],
          exclude: /node_modules/,
          include: path.join(__dirname, 'src')
      }, {
          test: /\.(less|css)$/,
          use: ["style-loader", "css-loader", "less-loader", "postcss-loader"]
      }, {
          test: /\.(png|jpg|gif|md)$/,
          use: ['file-loader?limit=10000&name=[md5:hash:base64:10].[ext]']
      }, {
          test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
          use: ['url-loader?limit=10000&mimetype=image/svg+xml']
      }],
  }
};