[webpack中文文档](https://webpack.docschina.org/)
![yarn语法](https://note.youdao.com/yws/res/16810/WEBRESOURCE5e9deae4ba81f2d9d1631772395a9a40)
#### webpack的安装
![webpack的安装](https://note.youdao.com/yws/res/16815/WEBRESOURCE952f785a54e37cc1cbd1c0cb168a7dd5)
```
yarn add webpack@3.10.1 --dev
```
#### 需要处理的文件类型
![文件类型](https://note.youdao.com/yws/res/16821/WEBRESOURCEe3931234abcfdb25f16f6f72a75893fb)
#### webpack常用模块
![webpack常用模块](https://note.youdao.com/yws/res/16827/WEBRESOURCE26f6eb42de497c5d062a8eca60e2a1ea)
#### webpack-dev-server
![webpack-dev-server](https://note.youdao.com/yws/res/16832/WEBRESOURCE5dcf8d2cd6c1af757623e5d31892ceac)
```
yarn add webpack-dev-server@2.9.7 --dev
```
#### webpack用法
> 创建webpack.config.js文件
```js
const path = require('path');
module.exports = {
entry: './src/app.js', //入口文件
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'app.js'
}
};
```
> 执行命令
```
node_module/.bin/webpack
```
##### 打包html的配置
> htmlWebpackPlugin
```
// 安装html-webpakc-plugin
yarn add html-webpack-plugin --dev
```
> 自定义html模版(title,mate等信息)
[配置链接](https://github.com/jantimon/html-webpack-plugin#options)
```
// webpack.config.js文件
plugins: [
new HtmlWebpackPlugin({
template: './src/index.html'
})
]
```
##### 安装babel
[参考链接](https://webpack.docschina.org/loaders/babel-loader/#src/components/Sidebar/Sidebar.jsx)
```
// 安装
// 多个插件之间空格分隔
yarn add babel-core@6.26.0 babel-present-env@1.6.1 babel-loader@7.1.2 --dev
// webpack.config.js配置
module: {
rules: [
{
test: /\.js$/,
exclude: /(node_modules|bower_components)/,
use: {
loader: 'babel-loader',
options: {
presets: ['@babel/preset-env'],
plugins: [require('@babel/plugin-transform-object-rest-spread')]
}
}
}
]
}
```
##### 安装处理React的插件
> `babel-preset-react`
```
//babel-preset-react
yarn add babel-preset-react@6.24.1 --dev
```
##### 如额使用React
```
// 安装react react-dom
yarn add react react-dom
```
##### 加载CSS
> `style-loader`与`css-loader`
```
module:{
rules: [
{
test: /\.css$/,
use: [
'style-loader',
'css-loader'
]
}
]
}
```
##### 将文件提取出来
> `ExtractTextWebpackPlugin`
[ExtractTextWebpackPlugin: 将包或包中的文本提取到单独的文件中。](https://webpack.docschina.org/plugins/extract-text-webpack-plugin/#src/components/Sidebar/Sidebar.jsx)
> 配置
```
const ExtractTextPlugin = require('extract-text-webpack-plugin');
module:{
rules: [
{
test: /\.css$/,
use: ExtractTextPlugin.extract({
fallback: "style-loader",
use: "css-loader"
})
}
]
},
plugins: [
new ExtractTextPlugin("styles.css"),
]
```
##### 处理sass
> `sass-loader`, `sass-loader`依赖`node-sass`与`webpack`
```
yarn add sass-loader node-sass
```
##### 图片资源处理
> 用`file-loader`与`url-loader`处理图片资源,`url-loader`依赖`file-loader`
```
// 安装
yarn add url-loader file-loader --dev
// 配置
module: {
rules: [
{
test: /\.(png|jpg|gif)$/,
use: [
{
loader: 'url-loader',
options: {
limit: 8192
}
}
]
}
]
}
```
##### font-awesome
```
yarn add font-awesome
// jsx中引入css
import 'font-awesome/css/font-awesome.min.css';
```
##### CommonsChunkPlugin
```
new webpack.optimize.CommonsChunkPlugin({
name: 'common',
filename: 'js/base.js'
})
```
#### webpack-dev-server
```
// 安装
yarn webpack-dev-server@2.9.7
// webpack.config.js中 配置
devServer: {
contentBase: './dist'
port: 8086
}
// 更改启动方式 package.json
"scripts": {
"dev" : "node_modulse/.bin/webpack-dev-server",
"dist": "node_modules/.bin/webpack -p" //添加-p为线上打包
}
```
##### resolve
> object
配置模块如何解析,例如,挡在ES2015中调用`import "loadsh"`, `resolve`选项能够对webpack查找`"lodash"`的方式去做修改。
###### resolve.alias
> object
创建`import`或`require`的别名,来确保模块引入变得更简单,例如一些位于`src/`文件夹下的常用模块
```
// webpack.config.js 配置
module.exports = {
// ...
resolve: {
alias: {
Utilities: path.resolve(__dirname, 'src/utilities/'),
Templates: path.resolve(__dirname, 'src/templates/')
}
}
}
```
现在,替换【在导入时使用相对路径】这种方式,就像这样:
```
import Utility from '../../utilities/utility';
```
可以这样使用别名
```
import Utility from 'Utilities/utility';
```
###### devServer.historyApiFallback
当使用 `HTML5 History API` 时,任意的 404 响应都可能需要被替代为 `index.html`。通过传入以下启用:
```
module.exports = {
// ...
devServer = {
historyApiFallback: {
index: '/dist/index.html'
}
}
}
```
###### 接口Api代理`devServer.proxy`
[参考地址](https://webpack.docschina.org/configuration/dev-server/#devserver-proxy)
如果你有单独的后端开发服务器 API,并且希望在同域名下发送 API 请求 ,那么代理某些 URL 会很有用(可以避免浏览器跨域报错)。
在 localhost:3000 上有后端服务的话,你可以这样启用代理:
```
// webpack.config.js配置
module.exports = {
// ...
devServer: {
proxy: {
'/api': 'http://localhost:3000'
}
}
}
```
请求到 `/api/users` 现在会被代理到请求 `http://localhost:3000/api/users`。
```
module.exports = {
// ...
devServer: {
proxy: {
'/manage': {
target: 'http://admintest.happymmall.com',
changeOrigin: true
},
'/user/logout.do': {
target: 'http://admintest.happymmall.com',
changeOrigin: true
}
}
}
}
```
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