Webpack案例学习

注：本来自己是打算学习一下requirejs的，结果从社区了解到Webpack的功能更强大而且更好用，就搜索到了篇文章。
本文是照着阮一峰老师的demo进行的练习。详见https://github.com/ruanyf/webpack-demos。这些列子都写得很简单明了，让我学习起来感觉轻松不少！

Webpack要怎么才能使用

1、首先必须要安装node，npm这些环境工具啦！
2、其次要安装Webpack和webpack-dev-server:

$ npm install webpack webpack-dev-server

3、然后clone这个.git到本地，到各个目录项并启动webpack-dev-server:

$ git clone git@github.com:ruanyf/webpack-demos.git
$ cd webpack-demos
$ npm install

然后你就可以在浏览器 http://127.0.0.1:8080 中看到页面了。

再进一步：webpack到底是什么？

Webpack是一个和grunt/gulp相似的前端构建系统，
Webpack可以用来像browserify那样进行前端模块儿话构建，但是，Webpack要更强大。
Webpack的配置文件是webpack.config.js:

// webpack.config.js
module.exports = {
  entry: './main.js',
  output: {
    filename: 'bundle.js'
  }
};

配置文件弄好了，就可以直接启动Webpack了

$ webapck

上面展示的是无参数启动，下面这些参数是需要知道的：

1. webpack – for building once for development
2. webpack -p – for building once for production (minification)
3. webpack –watch – for continuous incremental build
4. webpack -d – to include source maps

5. webpack –colors – for making things pretty

   To produce a production ready application, you could write scripts field in your package.json file as following.

// package.json
{
  // ...
  "scripts": {
    "dev": "webpack-dev-server --devtool eval --progress --colors",
    "deploy": "NODE_ENV=production webpack -p"
  },
  // ...
}

目录

Entry file
Multiple entry files
Babel-loader
CSS-loader
Image loader
CSS Module
UglifyJs Plugin
HTML Webpack Plugin and Open Browser Webpack Plugin
Environment flags
Code splitting
Code splitting with bundle-loader
Common chunk
Vendor chunk
Exposing Global Variables
Hot Module Replacement
React router

Entry file