1.package.json 

{
  "name": "element-starter",
  "description": "A Vue.js project",
  "author": "[email protected]",
  "private": true,
  "scripts": {
    "dev:test": "cross-env TARGET=test webpack-dev-server --inline --hot --env.dev",
    "dev:prod": "cross-env TARGET=prod webpack-dev-server --inline --hot --env.dev",
    
 
"build:test": "cross-env TARGET=test rimraf dist && webpack -p --progress --hide-modules",
    "build:prod": "cross-env TARGET=prod rimraf dist && webpack -p --progress --hide-modules",
    "start": "ws -z -d dist"
  },
  "dependencies": {
    "axios": "^0.18.0",
    "cross-env": "^5.2.0",
    
 
"element-ui": "^2.3.4",
    "local-web-server": "^2.6.0",
    "moment": "^2.22.2",
    "vue": "^2.5.16",
    "vue-qr": "^1.5.2",
    "vue-router": "^3.0.1"
  },
  "engines": {
    "node": ">=6"
  },
  "devDependencies": {
    "autoprefixer": "^6.6.0",
    "babel-core": "^6.24.1",
    "babel-loader": "^6.4.0",
    
 
"babel-preset-vue-app": "^1.2.0",
    "css-loader": "^0.27.0",
    "file-loader": "^0.10.1",
    "html-webpack-plugin": "^2.24.1",
    "postcss-loader": "^1.3.3",
    "rimraf": "^2.5.4",
    "style-loader": "^0.13.2",
    "url-loader": "^0.5.8",
    "vue-loader": "^13.3.0",
    "vue-template-compiler": "^2.5.16",
    "webpack": "^2.4.1",
    "webpack-dev-server": "^2.4.2"
  }
}

2. webpack.config.js

const resolve = require('path').resolve
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const url = require('url')
const publicPath = ''

module.exports = (options = {}) => ({
    entry: {
        vendor: './src/vendor',
        index: './src/main.js'
    },
    output: {
        path: resolve(__dirname, 'dist'),
        filename: options.dev ? '[name].js' : '[name].js?[chunkhash]',
        chunkFilename: '[id].js?[chunkhash]',
        publicPath: options.dev ? '/assets/' : publicPath
    },
    module: {
        rules: [{
            test: /\.vue$/,
            use: ['vue-loader']
        },
            {
                test: /\.js$/,
                use: ['babel-loader'],
                exclude: /node_modules/
            },
            {
                test: /\.css$/,
                use: ['style-loader', 'css-loader', 'postcss-loader']
            },
            {
                test: /\.(png|jpg|jpeg|gif|eot|ttf|woff|woff2|svg|svgz)(\?.+)?$/,
                use: [{
                    loader: 'url-loader',
                    options: {
                        limit: 10000
                    }
                }]
            }
        ]
    },
    plugins: [
        new webpack.optimize.CommonsChunkPlugin({
            names: ['vendor', 'manifest']
        }),
        new webpack.DefinePlugin({
            __TARGET__: JSON.stringify(process.env.TARGET || 'prod')
        }),
        new HtmlWebpackPlugin({
            template: 'src/index.html'
        })
    ],
    resolve: {
        alias: {
            '~': resolve(__dirname, 'src'),
            '@': resolve('src')
        },
        extensions: ['.js', '.vue', '.json', '.css']
    },
    devServer: {
        host: '0.0.0.0',
        port: 8010,
        proxy: {
            '/api/': {
                target: 'http://0.0.0.0:8080',
                changeOrigin: true,
                pathRewrite: {
                    '^/api': ''
                }
            }
        },
        historyApiFallback: {
            index: url.parse(options.dev ? '/assets/' : publicPath).pathname
        }
    },
    devtool: options.dev ? '#eval-source-map' : '#source-map'
})

3.api.js

axios.defaults.baseURL = 'test.com'

if (__TARGET__ === 'prod') {
    axios.defaults.baseURL = 'prod.com'
}