命令行
- 打包js
$ webpack hello.js bundle.js
// hello.js
require('./world.js');
function hello(str) {
console.log(str);
}
- 打包css
首先安装依赖：
cnpm i --save-dev style-loader css-loader
css-loader 使webpack能处理.css文件。
style-loader 把css-loader处理完返回的内容新建一个style标签并插入到head标签中。
// hello.js
require('./world.js');
require('style-loader!css-loader!./style.css');
function hello(str) {
console.log(str);
}
hello('hello world');
提示：
也可以直接require('./style.css')，命令行执行：webpack hello.js bundle.js --module-bind 'css=style-loader!css-loader'
- 参数
- --watch 监视文件变动并自动打包
- --progress 显示打包进度
- --display-modules 显示打包模块
- --display-reasons 显示打包原因
基本配置
单入口
// webpack.config.js
var path = require('path');
module.exports = {
entry: './src/scripts/main.js',
output: {
path: path.resolve(__dirname, 'dist/js'),
filename: 'bundle.js'
}
}
打包：$ webpack
如果命名为webpack.config.dev.js，则可以使用webpack --config webpack.config.dev.js
多入口
// webpack.config.js
var path = require('path');
module.exports = {
entry: ['./src/scripts/main.js', './src/scripts/a.js'],
output: {
path: path.resolve(__dirname, 'dist/js'),
filename: 'bundle.js'
}
}
多页面
// webpack.config.js
var path = require('path');
module.exports = {
entry: {
main: './src/scripts/main.js',
a: './src/scripts/a.js'
},
output: {
path: path.resolve(__dirname, 'dist/js'),
filename: '[name].[chunkHash].js' // 还可以是hash（打包的hash值）
}
}
生成html页面
安装插件：cnpm i --save-dev html-webpack-plugin
文档：https://www.npmjs.com/package/html-webpack-plugin
不指定模板
// webpack.config.js
var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: {
main: './src/scripts/main.js',
a: './src/scripts/a.js'
},
output: {
path: path.resolve(__dirname, 'dist/js'),
filename: '[name].[chunkHash].js'
},
plugins: [
new HtmlWebpackPlugin() // 不指定模板
]
}
指定模板
// webpack.config.js
var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: {
main: './src/scripts/main.js',
a: './src/scripts/a.js',
},
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'js/[name].[chunkHash].js',
publicPath: 'http://www.cdn.com/'
},
plugins: [
new HtmlWebpackPlugin({
filename: 'index.html',
template: 'index.html',
inject: false,
title: 'webpack is good',
minify: {
collapseWhitespace: true,
removeComments: true
}
})
]
}
<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title><%= htmlWebpackPlugin.options.title %></title>
<script src="<%= htmlWebpackPlugin.files.chunks.main.entry %>"></script>
</head>
<body>
<% for (var key in htmlWebpackPlugin.files) {%>
<%= key %>: <%= JSON.stringify(htmlWebpackPlugin.files[key]) %>
<% } %>
<% for (var key in htmlWebpackPlugin.options) {%>
<%= key %>: <%= JSON.stringify(htmlWebpackPlugin.options[key]) %>
<% } %>
<script src="<%= htmlWebpackPlugin.files.chunks.a.entry %>"></script>
</body>
</html>
```
## 多页面应用
```
// webpack.config.js
var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: {
main: './src/scripts/main.js',
a: './src/scripts/a.js',
b: './src/scripts/b.js',
c: './src/scripts/c.js',
},
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'js/[name].[chunkHash].js',
publicPath: 'http://www.cdn.com/'
},
plugins: [
new HtmlWebpackPlugin({
filename: 'a.html',
template: 'index.html',
inject: 'body',
title: 'a.html',
chunks: ['main', 'a']
}),
new HtmlWebpackPlugin({
filename: 'b.html',
template: 'index.html',
inject: 'body',
title: 'b.html',
chunks: ['b']
}),
new HtmlWebpackPlugin({
filename: 'c.html',
template: 'index.html',
inject: 'body',
title: 'c.html',
excludeChunks: ['b']
}),
]
}
```
## ES6
```
// webpack.config.js
var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: './src/app.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'js/[name].js'
},
module: {
rules: [
{
test: /\.js$/,
loader: 'babel-loader',
exclude: /node_modules/,
include: /src/,
query: {
presets: ['env']
}
}
]
},
plugins: [
new HtmlWebpackPlugin({
filename: 'index.html',
template: 'index.html',
inject: 'body'
})
]
}
或者
{
"name": "webpack-demo",
"version": "1.0.0",
"description": "",
"main": "index.js",
"babel": {
"presets": ["env"]
},
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"webpack": "webpack --progress --display-modules --colors --display-reasons"
},
"author": "",
"license": "ISC",
"devDependencies": {
"babel-core": "^6.24.0",
"babel-loader": "^6.4.1",
"babel-preset-env": "^1.3.2",
"html-webpack-plugin": "^2.28.0",
"webpack": "^2.3.3"
}
}
```
## 处理css
```
// webpack.config.js
var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');
module.exports = {
entry: './src/app.js',
output: {
path: path.resolve(__dirname, 'dist'),
filename: 'js/[name].js'
},
module: {
rules: [
{
test: /\.js$/,
loader: 'babel-loader',
exclude: /node_modules/,
include: /src/,
options: {
presets: ['env']
}
},
{
test: /\.css$/,
use: [
'style-loader',
'css-loader',
{
loader: 'postcss-loader?importLoaders=1',
options: {
plugins: function() {
return [
require('precss'),
require('autoprefixer')
]
}
}
}
]
},
{
test: /\.less$/,
use: [
'style-loader',
'css-loader',
{
loader: 'postcss-loader',
options: {
plugins: function() {
return [
require('precss'),
require('autoprefixer')
]
}
}
},
'less-loader'
]
},
{
test: /\.scss$/,
use: [
'style-loader',
'css-loader',
{
loader: 'postcss-loader',
options: {
plugins: function() {
return [
require('precss'),
require('autoprefixer')
]
}
}
},
'sass-loader'
]
}
]
},
plugins: [
new HtmlWebpackPlugin({
filename: 'index.html',
template: 'index.html',
inject: 'body'
})
]
}
```
## 模板文件
```
{
test: /\.html$/,
loader: 'html-loader'
},
```
## 图片
```
{
test: /\.(png|jpg|svg)$/i,
loader: 'file-loader'
}
```