webpack配置文件外置的两种实现方式

npm install generate-asset-webpack-plugin -S -D

const GenerateAssetPlugin = require('generate-asset-webpack-plugin');
const config = require('../config/app.config');

function createServerConfig(compilation) {
    return JSON.stringify(
        Object.assign({
            _hash: compilation.hash,
        },config)
    )
}
//生成app-config.json文件
module.exports = () => {
    return new GenerateAssetPlugin({
        filename: 'config/app-config.json',
        fn: (compilation, cb) => {
            cb(null, createServerConfig(compilation));
        }
    })
}

module.exports = {
  env: 'prod',
  baseUrl: "http://xxx.com"
}

const packageConfig = require('../package.json')
const generateAssetAppConfig = require('./generate-asset.config')

module.exports = {
  context: path.resolve(__dirname, '../'),
  entry: {
    app: './src/main.js'
  },
  output: {
    path: config.build.assetsRoot,
    filename: '[name].js',
    publicPath: process.env.NODE_ENV === 'production'
      ? config.build.assetsPublicPath
      : config.dev.assetsPublicPath
  },
  plugins: [
    generateAssetAppConfig(packageConfig)
  ],

import * as g from '../config/app.config'
import $ from 'jquery'

if (process.env.NODE_ENV === 'production') {//打包正式环境使用app-config.json
    $.ajax({
        url: 'config/app-config.json',
        async: false,
        type: 'get',
        dataType: "json",
        success: function (rs) {
            if (rs.baseUrl) {
                axios.defaults.baseURL = rs.baseUrl;
            }
        }
    });
} else {//开发环境就直接使用app.config.js
    axios.defaults.baseURL = g.baseUrl;   //配置接口地址
}

let baseURL = "http://xxx.com";

window.httpConfig = {
  baseURL,
};

	new CopyWebpackPlugin([
      {
        from: "./config/app.config.js",
        to: 'static',
      },
    ]),

 <script src="/static/app.config.js"></script>

import * as g from '../config/app.config'

// 如果是正式环境打包，去配置文件获取，如果是开发环境，去获取本机的app.config文件
axios.defaults.baseURL =
  process.env.NODE_ENV === "production"
    ? window.httpConfig.baseURL
    : g.baseURL;