最近研究了下webpack4，顺便用webpack 4搭建了一个vue项目，搭建过程如下：
1.安装node，然后使用npm init （初始化项目）；
npm init
2.npm i webpack vue vue-loader，同级创建src（建app.vue及index.js文件）、config（建webpack.config.base.js、webpack.config.dev.js、webpack.config.build.js）
npm i webpack vue vue-loader
3.新建src文件，在src中创建app.vue、index.js
app.vue中写入代码：
<template>
<div id="test">{
{test}}</div>
<template>
<script>
export default {
data(){
return{
test:'vueDemo'
}
}
}
</script>
<style>
#test{
color:red;
}
</style>
index.js中写入
import Vue from 'vue'
import app from './app.vue'
new Vue({
render:(h)=>h(app)
})
4.新建config目录，目录中创建webpack.config.base.js、webpack.config.dev.js、webpack.config.build.js
①webpack.config.base.js：这里用来配置开发和生产中的公共webpack配置，我们需要用到以下插件
npm i url-loader file-loader html-webpack-plugin
简单配置如下：
const path=require('path')
const {VueLoaderPlugin}=require('vue-loader')
const HtmlWebpackPlugin=require('html-webpack-plugin')
module.exports={
//输入
entry:{
path:path.join(__dirname,'../src/index.js'),
},
//输出
output:{
path:path.join(__dirname,'../dist'),
filename:'bundle.js'
},
resolve: {
alias:{
'vue$':'vue/dist/vue.esm.js'//配置别名 确保webpack可以找到.vue文件
},
extensions: ['.js', '.jsx','.json']
},
mode:process.env.NODE_ENV,
module:{
rules:[
{
test:/\.vue$/,
use:'vue-loader'
},
{
test:/\.(png|jpg|jepg|svg)$/,
use:[
{
loader:'url-loader',
options:{
limit:1024, //这里的单位是b
name:'images/[name][hash].[ext]' //打包后输出路径
}
}
]
}
]
},
plugins:[
new VueLoaderPlugin(),
new HtmlWebpackPlugin({
template:'./index.html',
inject: 'body',
minify: {
removeComments: true
}
})
]
}
②webpack.config.dev.js，这里我们需要将base的配置合并到dev中，需要用到webpack-merge
npm i webpack-merge
下载好后，还需安装css-style style-loader,用来解析css文件
npm i style-loader css-loader
再配置开发环境，需用到webpack-dev-server
npm i webpack-dev-server
dev中简单配置如下：
const base=require('./webpack.config.base')
const merge=require('webpack-merge')
const webpack=require('webpack')
module.exports=merge(base,{
devServer:{
port:8089,
host:'127.0.0.1',
open:true,
hot:true,
overlay:{erros:true}
},
module:{
rules:[
{
test:/\.css$/,
use:['style-loader','css-loader']
}
]
},
plugins:[
new webpack.HotModuleReplacementPlugin()
]
})
现我们需要执行开发启动命令 npm run dev，所以我们还需要用到一个设置当前执行环境的插件cross-env
npm i cross-env
下载好后，再package.json中配置：
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"dev": "cross-env NODE_ENV=development webpack-dev-server --config config/webpack.config.dev.js"
},
执行npm run dev,，报错
缺少webpack-cli，安装webpack-cli
npm webpack-cli
再执行，还是报错
缺少vue-template-compiler，安装vue-template-compiler
npm i vue-template-compiler
再执行npm run dev
可正常访问了，下面我们来安装vue-router
npm i vue-router
我们创建router目录，里面再创建router.js
import Vue from 'vue'
import Router from 'vue-router'
import Home from '../compnonts/home/index.vue'
import Mine from '../compnonts/mine/index.vue'
Vue.use(Router);
export default new Router({
routes:[
{
path:'/',
name:'home',
component:Home
},
{
path:'/mine',
name:'mine',
component:Mine
}
]
})
然后index.js 改成
import Vue from 'vue'
import app from './app.vue'
import router from './router/router'
new Vue({
el:'#app',
router,
render:(h)=>h(app)
})
app.vue改成
<template>
<router-view/>
</template>
<script>
export default {
name:'app'
}
</script>
启动
到这里我们的开发环境配置的差不多了
③webpack.config.build.js
首先我们需要把css从代码中分离出来，我们使用mini-css-extract-plugin
npm i mini-css-extract-plugin
每次打包后清除dist文件，安装clean-webpack-plugin
npm i clean-webpack-plugin
配置打包命令
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"dev": "cross-env NODE_ENV=development webpack-dev-server --config config/webpack.config.dev.js",
"build": "cross-env NODE_ENV=production webpack --config config/webpack.config.build.js"
},
现在执行下npm run build，已经可以正常打包了，我们把node_modules单独打包。build的简单配置如下：
const base=require('./webpack.config.base')
const merge=require('webpack-merge')
const MiniCssExtractPlugin =require('mini-css-extract-plugin')
const {CleanWebpackPlugin}=require('clean-webpack-plugin')
module.exports=merge(base,{
output:{
filename:'js/[name][hash].js',
chunkFilename:'js/vendor[id][hash].js'
},
optimization: {
splitChunks: {
cacheGroups: {
styles: {
name: 'styles',
test: /\.css$/,
chunks: 'all',
enforce: true
},
vendor:{
test: /node_modules/,
name: 'vendor',
chunks:'all'
}
}
}
},
module:{
rules:[
{
test:/\.css$/,
use:[
{loader:MiniCssExtractPlugin.loader},
'css-loader'
]
}
]
},
plugins:[
new MiniCssExtractPlugin({filename:'css/[hash].css'}),
new CleanWebpackPlugin()
]
})