简单搭建vue-cli3、vue-cli4项目

node --version//查看node版本
npm --version//查看npm版本

npm uninstall vue-cli -g

npm install @vue/cli -g //全局安装最新的脚手架
vue create my-project //创建新项目
选择自定义配置 （ 默认配置default、 手动配置Manually select features）
选择你需要的配置
Babel (必选)
TypeScript（项目中使用ts开发的话，就勾选）
Progressive Web App (PWA) Support (接口缓存，优化项目)
Router
Vuex 
CSS Pre-processors (css预处理器，需要)
Linter / Formatter (代码格式，一般默认选中)
Unit Testing (代码测试)
E2E Testing（需求界面测试）
根据你选的配置进行Y/N选择，选择完之后，就可以运行项目 
cd my-project // 进入到项目根目录
npm run dev
// 启动项目（默认是npm run serve ）我在package.json改过配置，"scripts": { "dev": "vue-cli-service serve --mode dev","prod": "vue-cli-service build --mode prod","test": "vue-cli-service build --mode test","lint": "vue-cli-service lint"},

{
"name": "my-project",
"version": "0.1.0",
"private": true,
"scripts": {
"dev": "vue-cli-service serve --mode dev",
"prod": "vue-cli-service build --mode prod",
"test": "vue-cli-service build --mode test",
"lint": "vue-cli-service lint"
},
"dependencies": {
"core-js": "^3.6.4",
"vue": "^2.6.11"
},
"devDependencies": {
"@vue/cli-plugin-babel": "~4.2.0",
"@vue/cli-plugin-eslint": "~4.2.0",
"@vue/cli-service": "~4.2.0",
"babel-eslint": "^10.0.3",
"eslint": "^6.7.2",
"eslint-plugin-vue": "^6.1.2",
"vue-template-compiler": "^2.6.11"
},
"eslintConfig": {
"root": true,
"env": {
"node": true
},
"extends": [
"plugin:vue/essential",
"eslint:recommended"
],
"parserOptions": {
"parser": "babel-eslint"
},
"rules": {}
},
"browserslist": [
"> 1%",
"last 2 versions"
]
}

#vue.config.js
module.exports = {
baseUrl: process.env.NODE_ENV === ‘production‘
? ‘//your_url‘
: ‘/‘,

outputDir: ‘dist‘,

assetsDir: ‘static‘,

filenameHashing: true,

// When building in multi-pages mode, the webpack config will contain different plugins
// (there will be multiple instances of html-webpack-plugin and preload-webpack-plugin).
// Make sure to run vue inspect if you are trying to modify the options for those plugins.
pages: {
index: {
// entry for the pages
entry: ‘src/pages/index/index.js‘,
// the source template
template: ‘src/pages/index/index.html‘,
// output as dist/index.html
filename: ‘index.html‘,
// when using title option,
// template title tag needs to be <title><%= htmlWebpackPlugin.options.title %></title>
title: ‘首页‘,
// chunks to include on this pages, by default includes
// extracted common chunks and vendor chunks.
chunks: [‘chunk-vendors‘, ‘chunk-common‘, ‘index‘]
}
// when using the entry-only string format,
// template is inferred to be `public/subpage.html`
// and falls back to `public/index.html` if not found.
// Output filename is inferred to be `subpage.html`.
// subpage: ‘‘
},

// eslint-loader 是否在保存的时候检查
lintOnSave: true,

// 是否使用包含运行时编译器的Vue核心的构建
runtimeCompiler: false,

// 默认情况下 babel-loader 忽略其中的所有文件 node_modules
transpileDependencies: [],

// 生产环境 sourceMap
productionSourceMap: false,

// cors 相关 https://jakearchibald.com/2017/es-modules-in-browsers/#always-cors
// corsUseCredentials: false,
// webpack 配置，键值对象时会合并配置，为方法时会改写配置
// https://cli.vuejs.org/guide/webpack.html#simple-configuration
configureWebpack: (config) => {
},

// webpack 链接 API，用于生成和修改 webapck 配置
// https://github.com/mozilla-neutrino/webpack-chain
chainWebpack: (config) => {
// 因为是多页面，所以取消 chunks，每个页面只对应一个单独的 JS / CSS
config.optimization
.splitChunks({
cacheGroups: {}
});

// ‘src/lib‘ 目录下为外部库文件，不参与 eslint 检测
config.module
.rule(‘eslint‘)
.exclude
.add(‘/Users/maybexia/Downloads/FE/community_built-in/src/lib‘)
.end()
},

// 配置高于chainWebpack中关于 css loader 的配置
css: {
// 是否开启支持 foo.module.css 样式
modules: false,

// 是否使用 css 分离插件 ExtractTextPlugin，采用独立样式文件载入，不采用 <style> 方式内联至 html 文件中
extract: true,

// 是否构建样式地图，false 将提高构建速度
sourceMap: false,

// css预设器配置项
loaderOptions: {
css: {
// options here will be passed to css-loader
},

postcss: {
// options here will be passed to postcss-loader
}
}
},

// All options for webpack-dev-server are supported
// https://webpack.js.org/configuration/dev-server/
devServer: {
open: true,

host: ‘127.0.0.1‘,

port: 3000,

https: false,

hotOnly: false,

proxy: null,

before: app => {
}
},
// 构建时开启多进程处理 babel 编译
parallel: require(‘os‘).cpus().length > 1,

// https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-pwa
pwa: {},

// 第三方插件配置
pluginOptions: {}
};

vue inspect > output.js //根目录下生成output.js， webpack 配置信息，不用去看 cli-service 源码

VUE_APP_NAME=11

VUE_APP_US=22

VUE_APP_US=44

VUE_APP_US=33

# Sass
npm install -D sass-loader node-sass

# Less
npm install -D less-loader less

# Stylus
npm install -D stylus-loader stylus