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

React系列---Webpack環(huán)境搭建（一）手動搭建
React系列---Webpack環(huán)境搭建（二）不同環(huán)境不同配置
React系列---Webpack環(huán)境搭建（三）打包性能優(yōu)化

實際項目中，往往不同環(huán)境有不同的構(gòu)建需求。比如開發(fā)、測試和生產(chǎn)環(huán)境對應(yīng)的后端接口地址不同，生產(chǎn)環(huán)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(chǔ)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(fā)環(huán)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(huán)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(huán)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(fā)調(diào)試
npm run start
# 開發(fā)環(huán)境構(gòu)建
npm run build:dev
# 測試環(huán)境構(gòu)建
npm run build:test
# 生產(chǎn)環(huán)境構(gòu)建
npm run build

項目中就可以像下面這樣子調(diào)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(huán)境搭建（一）手動搭建
React系列---Webpack環(huán)境搭建（二）不同環(huán)境不同配置
React系列---Webpack環(huán)境搭建（三）打包性能優(yōu)化