摘要：系列環境搭建一手動搭建系列環境搭建二不同環境不同配置系列環境搭建三打包性能優化實際項目中，往往不同環境有不同的構建需求。

React系列---Webpack環境搭建（一）手動搭建
React系列---Webpack環境搭建（二）不同環境不同配置
React系列---Webpack環境搭建（三）打包性能優化

實際項目中，往往不同環境有不同的構建需求。比如開發、測試和生產環境對應的后端接口地址不同，生產環境需要進行代碼混淆、壓縮等。

因此，往往還需要將webpack配置分成多個：

安裝webpack-merge，用于合并配置：

npm install webpack-merge --save-dev

安裝uglifyjs-webpack-plugin，用于js代碼壓縮：

npm install uglifyjs-webpack-plugin --save-dev

webpack -p也可以用于代碼壓縮。相對而言，使用uglifyjs-webpack-plugin，可以對壓縮進行更靈活的控制。

拆分webpack.config.js為以下幾個配置：

基礎配置 webpack.base.config.js：

const path = require("path");
const webpack = require("webpack");

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const BUILD_PATH = path.resolve(ROOT_PATH, "dist");

module.exports = {
    entry: {
        index: path.resolve(SRC_PATH, "index.jsx")
    },
    output: {
        path: BUILD_PATH,
        filename: "js/[name].[hash:5].js"
    },
    resolve: {
        extensions: [".js", ".jsx"]
    },
    module: {
        loaders: [
            {
                test: /.jsx?$/,
                loaders: ["eslint-loader"],
                include: SRC_PATH,
                enforce: "pre"
            }, {
                test: /.jsx?$/,
                loaders: ["babel-loader"],
                include: SRC_PATH,
                exclude: path.resolve(ROOT_PATH, "node_modules")
            }
        ]
    }
};

開發環境配置,webpack.dev.config.js：

const path = require("path");
const webpack = require("webpack");
const HtmlwebpackPlugin = require("html-webpack-plugin");
const merge = require("webpack-merge");
const baseConfig = require("./webpack.base.config.js");

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const devConfig = merge(baseConfig, {
    devtool: "eval-source-map",
    plugins: [
        new webpack.DefinePlugin({
            "process.env.NODE_ENV": ""development""
        }),
        new HtmlwebpackPlugin({
            title: "react-webpack-demo",
            filename: "index.html",
            template: path.resolve(SRC_PATH, "templates", "index.html")
        })
    ]
});

module.exports = devConfig;

測試環境配置,webpack.test.config.js：

const path = require("path");
const webpack = require("webpack");
const HtmlwebpackPlugin = require("html-webpack-plugin");
const merge = require("webpack-merge")
const baseConfig = require("./webpack.base.config.js");

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const testConfig = merge(baseConfig, {
    plugins: [
        new webpack.DefinePlugin({
            "process.env.NODE_ENV": ""test""
        }),
        new webpack.optimize.UglifyJsPlugin({
            sourceMap: true,
        }),
        new HtmlwebpackPlugin({
            title: "react-webpack-demo",
            filename: "index.html",
            template: path.resolve(SRC_PATH, "templates", "index.html"),
            minify: {
                removeComments: true,
                collapseWhitespace: true,
                removeRedundantAttributes: true,
                removeScriptTypeAttributes: true,
                removeStyleLinkTypeAttributes: true,
                removeAttributeQuotes: true
            }
        })
    ]
});

module.exports = testConfig;

生成環境配置,webpack.prod.config.js：

const path = require("path");
const webpack = require("webpack");
const HtmlwebpackPlugin = require("html-webpack-plugin");
const merge = require("webpack-merge")
const baseConfig = require("./webpack.base.config.js")

const ROOT_PATH = path.resolve(__dirname);
const SRC_PATH = path.resolve(ROOT_PATH, "src");
const prodConfig = merge(baseConfig, {
    plugins: [
        new webpack.DefinePlugin({
            "process.env.NODE_ENV": ""production""
        }),
        new webpack.optimize.UglifyJsPlugin({
            sourceMap: true,
        }),
        new HtmlwebpackPlugin({
            title: "react-webpack-demo",
            filename: "index.html",
            template: path.resolve(SRC_PATH, "templates", "index.html"),
            minify: {
                removeComments: true,
                collapseWhitespace: true,
                removeRedundantAttributes: true,
                removeScriptTypeAttributes: true,
                removeStyleLinkTypeAttributes: true,
                removeAttributeQuotes: true
            }
        })
    ]
});

module.exports = prodConfig;

修改package.json：

"scripts": {
    "start": "webpack-dev-server --hot --progress --config webpack.dev.config.js",
    "build:dev": "rimraf dist && webpack --progress --config webpack.dev.config.js",
    "build:test": "rimraf dist && webpack --progress --config webpack.test.config.js",
    "build": "rimraf dist && webpack --progress --config webpack.prod.config.js"
},

# 啟動開發調試
npm run start
# 開發環境構建
npm run build:dev
# 測試環境構建
npm run build:test
# 生產環境構建
npm run build

項目中就可以像下面這樣子調用后端接口

接口HOST定義，host.js：

if (process.env.NODE_ENV === "development") {
  module.exports = `http://192.168.1.101:8000`
} else if (process.env.NODE_ENV === "test") {
  module.exports = `http://192.168.1.102:8000`
} else {
  module.exports = `http://192.168.1.103:8000`
}

接口API定義，apis.js：

import host from "./host"

function getApi (api) {
  return host + api
}

export default {
  login: getApi("/login"),
  logout: getApi("/logout"),
  ...
}

代碼：https://github.com/zhutx/reac...

React系列---Webpack環境搭建（一）手動搭建
React系列---Webpack環境搭建（二）不同環境不同配置
React系列---Webpack環境搭建（三）打包性能優化