新建文件夹 webpack-vue
安装依赖
yarn init //初始化package.json
yarn add webpack webpack-cli //添加webpack、webpack-cli
//ps:不知那个版本开始就需要安装webpack-cli了
新建index.html
// index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>webpack v4</title>
</head>
<body>
<div id="root"></div>
<script src="dist/main.js"></script>
</body>
</html>
新建文件夹src,在src下新建index.js
// src/index.js
console.log('hello webpack v4');
第一次打包
//终端
webpack
你会发现目录底下多了dist文件夹里面有main.js,打开index.html 可以看到console里已经打印出了hello webpack v4,
在终端会有一个警告提示,大致意思是 没有设置mode将会使用生产模式,需要指定开发环境或者生产环境,打开dist/main.js,发现js确实是被压缩过的
//console
hello webpack v4
package.json
//package.json
...
"scripts":{
"start":"--mode development",
"build": "--mode production"
}
...
第二次打包
yarn start //开发环境
yarn build //生产环境(压缩)
webpack-dev-server
手动打开浏览器太麻烦
//终端
yarn add webpack-dev-server //添加webpack-dev-server
//修改index.html
<script src="main.js"></script>
//修改package.json
...
"scripts": {
"start": "webpack-dev-server --mode development --open",
"build": "webpack --mode production"
}
...
第三次打包
yarn start
自动打开浏览器了,
修改index.js试试
加入Vue
我们将一个一个解决问题,不会一次安装所有依赖
yarn add vue //添加依赖
在src下面新建文件夹pages,在pages里面新建app.vue文件
//app.vue
<template>
<section class="main">
<p>我来了{{name}}</p>
</section>
</template>
<script>
export default {
data () {
return {
name:"vue + webpack"
}
}
}
</script>
<style>
.main>p{
color: #000;
}
</style>
修改index.js
import Vue from 'vue'
import App from './pages/app.vue'
new Vue({
el:"#root",
render:h=>h(App)
})
//终端
yarn start
这时候可预见的报错来了,
Uncaught Error: Module parse failed: Unexpected token (1:0)
You may need an appropriate loader to handle this file type.
//翻译:模块解析失败,您可能需要一个适当的加载程序来处理这个文件类型
看报错,我们一个个解决
搜索关键词,很容易发现是没有安装vue-loader,新建webpack.config.js
//webpack.config.js
module.exports = {
module:{
rules:[
{test:/\.vue$/,use:'vue-loader'}
]
}
}
vue-loader在15之后需要在webpack.config.js中当插件引入
const VueLoaderPlugin = require('vue-loader/lib/plugin')
module.exports = {
// ...
plugins: [
new VueLoaderPlugin()
]
}
//终端
yarn start
再次报错
Uncaught Error: Module build failed: Error: Cannot find module 'vue-template-compiler'
...
很明显,要你安装vue-template-compiler
yarn add vue-template-compiler
//终端
yarn start
继续报错
Module not found: Error: Can't resolve 'css-loader'
提示安装css-loader
yarn add css-loader
bingo! webpack4+vue2第一个项目成功运行
从js中分离css
这时候细心的你发现css被塞到head里面,我们来把css分离出来。使用webpack的插件extract-text-webpack-plugin@next
yarn add extract-text-webpack-plugin@next
在webpack.config.js中添加插件
//webpack.config.js
const ExtractTextWebapckPlugin = require('extract-text-webpack-plugin'); //引入插件
module.exports = {
module:{
rules:[
{
test: /\.vue$/,
loader: 'vue-loader',
options: {
loaders: {
css: ExtractTextWebapckPlugin.extract({ use: 'css-loader' })
}
}
}
]
},
plugins:[
new ExtractTextWebapckPlugin('style.css')
]
}
index.html引入css
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>webpack v4</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="root"></div>
<script src="main.js"></script>
</body>
</html>
//终端
yarn build
打包完成后dist目录里面出现了main.js和style.css
处理图片
新建文件夹img,用来放图片
//app.vue
<template>
<section class="main">
<p>我来了{{name}}</p>
<img src="../img/1.jpg" alt="">
</section>
</template>
<script>
export default {
data () {
return {
name:"vue + webpack"
}
}
}
</script>
<style>
.main>p{
color: #000;
}
</style>
//终端
yarn start
//报错
./src/img/1.jpg
Module parse failed: Unexpected character '�' (1:0)
You may need an appropriate loader to handle this file type.
基本可以看出来是图片有问题,没有loader处理图片
file-loader与url-loader
yarn add file-loader url-loader
修改webpack.config.js
//webpack.config.js
...
rule:[
...
{
test: /\.(png|jpg|gif)$/,
use: [{ loader: 'url-loader',options: { limit: 8192 } }]
}
...
]
...
yarn start
打包成功…
webpack其余一些配置
resolve,watchOptions,devServer
//webpack.config.js
resolve: { //导入的时候不用写拓展名
extensions: [' ', '.js', '.json', '.vue', '.scss', '.css']
},
watchOptions: {
ignored: /node_modules/,
aggregateTimeout: 300,//防止重复保存频繁重新编译,300ms内重复保存不打包
poll: 1000 //每秒询问的文件变更的次数
},
devServer:{
inline: true,
compress: true,
host: '127.0.0.1',
port: 2500,
historyApiFallback: true
}