详解Webpack多环境代码打包的方法

"scripts": {
  "dev": "node build/dev-server.js",
  "build": "node build/build.js",　　　　　　//正式环境打包命令
  "fev": "node build/test.js"       //测试环境打包命令
 },

// https://github.com/shelljs/shelljs
require('./check-versions')()

process.env.NODE_ENV = 'fev'

var ora = require('ora')
var path = require('path')
var chalk = require('chalk')
var shell = require('shelljs')
var webpack = require('webpack')
var config = require('../config')
var webpackConfig = require('./webpack.test.conf')

var spinner = ora('building for fev...')
spinner.start()

var assetsPath = path.join(config.fev.assetsRoot, config.fev.assetsSubDirectory)
shell.rm('-rf', assetsPath)
shell.mkdir('-p', assetsPath)
shell.config.silent = true
shell.cp('-R', 'static/*', assetsPath)
shell.config.silent = false

webpack(webpackConfig, function (err, stats) {
 spinner.stop()
 if (err) throw err
 process.stdout.write(stats.toString({
  colors: true,
  modules: false,
  children: false,
  chunks: false,
  chunkModules: false
 }) + '\n\n')

 console.log(chalk.cyan(' Build complete.\n'))
 console.log(chalk.yellow(
  ' Tip: built files are meant to be served over an HTTP server.\n' +
  ' Opening index.html over file:// won\'t work.\n'
 ))
})

var path = require('path')
var utils = require('./utils')
var webpack = require('webpack')
var config = require('../config')
var merge = require('webpack-merge')
var baseWebpackConfig = require('./webpack.base.conf')
var HtmlWebpackPlugin = require('html-webpack-plugin')
var ExtractTextPlugin = require('extract-text-webpack-plugin')
var env = config.fev.env

var webpackConfig = merge(baseWebpackConfig, {
 module: {
  rules: utils.styleLoaders({
   sourceMap: config.fev.productionSourceMap,
   extract: true
  })
 },
 devtool: config.fev.productionSourceMap "text-align: center">

test.env.js 增加环境变量


module.exports = {
 NODE_ENV: '"fev"'
}


index.js


// see http://vuejs-templates.github.io/webpack for documentation.
var path = require('path')

module.exports = {
  build: {
    env: require('./prod.env'),
    index: path.resolve(__dirname, '../dist/index.html'),
    assetsRoot: path.resolve(__dirname, '../dist'),
    assetsSubDirectory: 'static',
    // assetsPublicPath: './',
    assetsPublicPath: '',    //公共资源路径
    productionSourceMap: false,
    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],
    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report
  },
  fev: {
    env: require('./test.env'),
    index: path.resolve(__dirname, '../dist/index.html'),
    assetsRoot: path.resolve(__dirname, '../dist'),
    assetsSubDirectory: 'static',
    assetsPublicPath: './',  //公共资源路径
    productionSourceMap: false,
    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],
    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report
  },
  test: {
    env: require('./test.env'),
    index: path.resolve(__dirname, '../dist/index.html'),
    assetsRoot: path.resolve(__dirname, '../dist'),
    assetsSubDirectory: 'static',
    assetsPublicPath: './',
    productionSourceMap: false,
    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],
    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report
  },
  dev: {
    env: require('./dev.env'),
    port: 8081,
    autoOpenBrowser: true,
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    proxyTable: {
      // '/api':{
      //   target:'http://jsonplaceholder.typicode.com',
      //   changeOrigin:true,
      //   pathRewrite:{
      //     '/api':''
      //   }
      // }
    },
    // CSS Sourcemaps off by default because relative paths are "buggy"
    // with this option, according to the CSS-Loader README
    // (https://github.com/webpack/css-loader#sourcemaps)
    // In our experience, they generally work as expected,
    // just be aware of this issue when enabling this option.
    cssSourceMap: false
  }
}


4、在main.js文件中在增加环境变量判断


if(process.env.NODE_ENV == 'production'){
  defines.html_url = '正式环境URL';
}
if(process.env.NODE_ENV == 'development'){
　　defines.html_url = '开发环境URL';
} 
if(process.env.NODE_ENV == 'fev'){ 
　　defines.html_url = '测试环境URL'; 
}


5、如果公共资源路径，在不同环境中需要更改。在webpack.base.conf.js 中配置打包文件输出的公共路径。


var path = require('path')
var utils = require('./utils')
var config = require('../config')
var vueLoaderConfig = require('./vue-loader.conf')
//增加文件路径判断
var webpack_public_path = '';
 if(process.env.NODE_ENV === 'production'){
  webpack_public_path = config.build.assetsPublicPath;
 }else if(process.env.NODE_ENV === 'fev'){
  webpack_public_path = config.fev.assetsPublicPath;
 }else if(process.env.NODE_ENV === 'dev'){
  webpack_public_path = config.dev.assetsPublicPath;
 }
function resolve (dir) {
 return path.join(__dirname, '..', dir)
}
module.exports = {

 //测试使用
 entry: {
  app: ["promise-polyfill", "./src/main.js"]
 },
 // entry: {
 //  app: './src/main.js'
 // },
 output: {
  path: config.build.assetsRoot,
  filename: '[name].js',
  publicPath: webpack_public_path
  // publicPath: process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'fev' ? config.build.assetsPublicPath
  //  : config.dev.assetsPublicPath
 },

 resolve: {
  extensions: ['.js', '.vue', '.json'],
  modules: [
   resolve('src'),
   resolve('node_modules'),
  ],
  alias: {
   'vue$': 'vue/dist/vue.common.js',
   'src': resolve('src'),
   'assets': resolve('src/assets'),
   'components': resolve('src/components'),
   'vendor': path.resolve(__dirname, '../src/api'),
   // 'vendor': path.resolve(__dirname, '../src/vendor'),
  }
 },
 module: {
  rules: [
   {
    test: /\.vue$/,
    loader: 'vue-loader'
   },
   {
    test: /\.js$/,
    loader: 'babel-loader',
    include: [resolve('src'), resolve('test')]
   },
   {
    test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
    loader: 'url-loader',
    query: {
     limit: 10000,
     name: utils.assetsPath('img/[name].[hash:7].[ext]')
    }
   },
   {
    test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
    loader: 'url-loader',
    query: {
     limit: 10000,
     name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
    }
   }
  ]
 }
}


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