摘要：先來說說搭建官方文檔上也有提供直接下載包，但是修改配置比較麻煩修改配置需要執行自行搭建一個項目并且配置主要記錄學習階段總結的可能不太好，勉強看看，重點記錄一下第二種的方式通過管理包下載官網鏈接安裝步驟都有的在項目目錄下，執行會出

先來說說react搭建：
1 官方文檔上也有提供直接下載react包，但是修改webpack配置比較麻煩

npx create-react-app my-app
cd my-app
npm start

修改webpack配置需要執行

npm run eject

2 自行搭建一個項目并且配置webpack--主要記錄學習階段～總結的可能不太好，勉強看看，重點記錄一下第二種的方式

通過yarn管理包
 

下載yarn

yarn官網鏈接安裝步驟都有的

在項目目錄下，執行yarn init

會出現我們的package.json文件

安裝webpack

yarn add webpack --dev

新建webpack.config.js文件，

貼官網示例:

       const path = require("path");
       module.exports = {
         entry: "./src/app.js",
         output: {
           path: path.resolve(__dirname, "dist"),
           filename: "app.js"
         }
       };

命令行執行webpack會發現dist目錄

注意：yarn安裝過程中如果出錯，嘗試將yarn切換到淘寶鏡像再進行下載哦～，我安裝過程中出現過問題，切到這就沒問題了
yarn config set registry "https://registry.npm.taobao.org"

安裝html-webpack-plugin

yarn add html-webpack-plugin --dev

文檔使用鏈接地址
按照文檔操作，修改webpack.config.js使用html-webpack-plugin打包html文件
再次執行webpack命令，會發現dist文件夾下面多了一個index.html
設置html-webpack-plugin的template模版,在src新建index.html,并且設置html內容

  
    const path = require("path");
    var HtmlWebpackPlugin = require("html-webpack-plugin");
    module.exports = {
      entry: "./src/app.js",
      output: {
        path: path.resolve(__dirname, "dist"),
        filename: "app.js"
      },
      plugins: [new HtmlWebpackPlugin(
        {
            template:"./src/index.html"
        }
      )]
    };

現在dist文檔下面的index.html就是當前src下的index.html的模版了

安裝babel

yarn add babel-loader @babel/core @babel/preset-env

具體詳情見文檔地址 在src/app.js中寫入一些ES6語法，再次執行webpack命令，dist/app.js進行了轉換

安裝react轉換 babel-preset-react

yarn add babel-preset-react --dev

修改webpack.config.js

   const path = require("path");
   var HtmlWebpackPlugin = require("html-webpack-plugin");
   module.exports = {
     entry: "./src/app.jsx"
       path: path.resolve(__dirname, "dist"),
       filename: "app.js"
     },
     plugins: [new HtmlWebpackPlugin(
       {
           template:"./src/index.html"
       }
     )],
     module: {
       rules: [
         {
           test: /.m?jsx$/,
           exclude: /(node_modules|bower_components)/,
           use: {
             loader: "babel-loader",
             options: {
               presets: ["@babel/preset-env","react"]
             }
           }
         }
       ]
     }
   };

安裝react
yarn add react react-dom
react添加操作地址詳情
將src/app.js修改為app.jsx

   import React from "react";
   import ReactDOM from "react-dom";

   ReactDOM.render(
     
Hello, world!
,
     document.getElementById("app")
   );

再執行webpack進行打包
如果出現Error: Plugin/Preset files are not allowed to export objects, only functions.錯誤

說明babel的版本不一致，我這邊是因為"babel-preset-react": "^6.24.1"默認裝的6版本，其他babel安裝的是7版本，所以統一升級到7或者降級到6

yarn add babel-preset-react@7.0.0 --dev

這樣在進行打包，就可以了，這個時候打開dist/index.html我們看到hello, world!說成功編譯了react

安裝style-loader

yarn add css-loader style-loader --dev
安裝地址操作詳情
在webpack.config.js的rules中添加

 {
   test: /.css$/,
   use: ["style-loader", "css-loader"],
 },

在src下新建一個文件index.css，隨便修改一點樣式

   h1{
       color:#F00;
   }

在app.jsx中引入

   import "./index.css"

再次執行webpack打包，刷新dist/index.html

安裝ExtractTextWebpackPlugin插件將css獨立到多帶帶的文件

   yarn add extract-text-webpack-plugin --dev

官網鏈接地址

   const path = require("path");
   var HtmlWebpackPlugin = require("html-webpack-plugin");
   const ExtractTextPlugin = require("extract-text-webpack-plugin");
   module.exports = {
       entry: "./src/app.jsx",
       output: {
           path: path.resolve(__dirname, "dist"),
           filename: "app.js"
       },
       module: {
           rules: [
           {
               test: /.m?jsx$/,
               exclude: /(node_modules|bower_components)/,
               use: {
               loader: "babel-loader",
               options: {
                   presets: ["@babel/preset-env","react"]
               }
               }
           },
           {
               test: /.css$/,
               use: ExtractTextPlugin.extract({
                   fallback: "style-loader",
                   use: "css-loader"
               })
           },
           ]
       },
       plugins: [
           new HtmlWebpackPlugin(
               {
                   template:"./src/index.html"
               }
           ),
           new ExtractTextPlugin("index.css"),
       ],
   };

webpack.config.js配置如上
再次執行webpack，dist目錄下就多了一個index.css了～
注意：打包遇到Tapable.plugin is deprecated. Use new API on .hooks instead錯誤，原因是extract-text-webpack-plugin目前版本不支持webpack4
執行：yarn add extract-text-webpack-plugin@next --dev

安裝sass-loader

   yarn add sass-loader --dev

在webpack.config.js中rules添加

   {
       test: /.scss$/,
       use: ExtractTextPlugin.extract({
           fallback: "style-loader",
           use: ["css-loader", "sass-loader"]
       })
   }

新建一個index.scss文件

   body{
       background: #ccc;
       #app{
           font-size: 22px;
       }
   }

在執行webpack會出現報錯Cannot find module "node-sass"
查看文檔鏈接
需要安裝node-sass

   yarn add node-sass --dev

打包，查看index.html可以看到樣式應用上去了～

安裝url-loader處理圖片鏈接

   yarn add url-loader file-loader --dev

官網地址
在rules中加入：

   {
       test: /.(png|jpg|gif)$/i,
       use: [
         {
           loader: "url-loader",
           options: {
             limit: 8192
           }
         }
       ]
   }

項目中引入圖片，進行打包，這樣圖片資源也打包解析進去了～

添加解析字體rule

  {
       test: /.(eot|svg|ttf|woff|woff2|otf)$/i,
       use: [
           {
             loader: "url-loader",
             options: {
               limit: 8192,
               name:"resource/[name].[ext]"
             }
           }
       ]
   },

添加webpack-dev-server

   yarn add webpack-dev-server --dev

修改package.json添加
"scripts": {
"test": "echo "Error: no test specified" && exit 1",
"watch": "webpack --watch",
"start": "webpack-dev-server --open",
"build": "webpack-cli"
}
執行yarn run start啟動項目

yarn run build打包項目

最后附上當前為止修改后的webpack.config.js

       const path = require("path");
       const webpack = require("webpack");
       var HtmlWebpackPlugin = require("html-webpack-plugin");
       const ExtractTextPlugin = require("extract-text-webpack-plugin");
       module.exports = {
           entry: "./src/app.jsx",
           output: {
               path: path.resolve(__dirname, "dist"),
               filename: "./js/[name].[hash].js",
               chunkFilename: "./js/[name].[hash].js",
           },
           devServer: {
               port: 8080,
               proxy: {
                   "/expo": {
                       target: "https://xxx",
                       changeOrigin: true,
                       pathRewrite: {
                           "/expo": "/expo",
                       },
                       secure: false,
                   },
               },
               hot:true
           },
           module: {
               rules: [
               {
                   test: /.m?jsx$/,
                   exclude: /(node_modules|bower_components)/,
                   use: {
                   loader: "babel-loader",
                   options: {
                       presets: ["@babel/preset-env","react"]
                   }
                   }
               },
               {
                   test: /.css$/,
                   use: ExtractTextPlugin.extract({
                       fallback: "style-loader",
                       use: "css-loader"
                   })
               },
               {
                   test: /.scss$/,
                   use: ExtractTextPlugin.extract({
                       fallback: "style-loader",
                       use: ["css-loader", "sass-loader"]
                   })
               },
               {
                   test: /.(png|jpg|gif|ico|jpeg)$/i,
                   use: [
                     {
                       loader: "url-loader",
                       options: {
                           limit: 8192,
                           name: "[name].[ext]",
                           publicPath: "../images/",
                           outputPath: "images/"
                       }
                     }
                   ]
               },
               {
                   test: /.(eot|svg|ttf|woff|woff2|otf)$/i,
                   use: [{
                       loader: "file-loader",
                       options: {
                         name: "[name].[ext]",
                         publicPath: "../fonts/",
                         outputPath: "fonts/"
                       }
                   }]
               },
               ]
           },
           plugins: [
               new HtmlWebpackPlugin(
                   {
                       template:"./src/index.html"
                   }
               ),
               new ExtractTextPlugin("css/[name].css"),
           ],
           optimization:{
               splitChunks:{
                   name:"common",
                   filename:"js/base.js"
               }
           }
       };