二、vue.js 目录和配置说明

一、目录结构说明

二、配置说明： 

1.build--webpack.base.conf.js 添加注释说明

'use strict'
const path = require('path')
const utils = require('./utils')// 引入utils工具模块
const config = require('../config')// 引入config目录下的index.js配置文件，主要用来定义一些开发和生产环境的属性
const vueLoaderConfig = require('./vue-loader.conf')// vue-loader.conf配置文件是用来解决各种css文件的，定义了诸如css,less,sass之类的和样式有关的loader
// 返回到dir为止的绝对路径
function resolve (dir) {
  return path.join(__dirname, '..', dir)
}

const createLintingRule = () => ({
  test: /.(js|vue)$/,
  loader: 'eslint-loader',
  enforce: 'pre',
  include: [resolve('src'), resolve('test')],
  options: {
    formatter: require('eslint-friendly-formatter'),
    emitWarning: !config.dev.showEslintErrorsInOverlay
  }
})

// 配置webpack编译入口
module.exports = {
  context: path.resolve(__dirname, '../'),
  //entry告诉Webpack哪些文件是应用程序的入口点;主要文件;
  entry: {
    app: './src/main.js'
  },
  // 配置webpack输出路径和命名规则
  output: {
    //path代表我们要输出的路径，config.build.assetsRoot里是assetsRoot: path.resolve(__dirname, '../dist')，这个是想把打包出来的文件路径放在根目录的dist目录下。
    path: config.build.assetsRoot,
    //filename: '[name].js'文件名，这个是用来打包后出的文件名，name就是入口文件前面的key值
    filename: '[name].js',
    publicPath: process.env.NODE_ENV === 'production'// webpack编译输出的发布路径; 上线地址，也就是真正的文件引用路径，
      ? config.build.assetsPublicPath
      : config.dev.assetsPublicPath
  },
  resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias: {
      'vue$': 'vue/dist/vue.esm.js',
      '@': resolve('src'),
    }
  },

  
// module配置不同类型模块的处理规则
  module: {
    rules: [
      ...(config.dev.useEslint ? [createLintingRule()] : []),
      // 对vue文件使用vue-loader，该loader是vue单文件组件的实现核心，专门用来解析.vue文件的
      {
        test: /.vue$/,
        loader: 'vue-loader',// 对js文件使用babel-loader转码,该插件是用来解析es6等代码
        options: vueLoaderConfig
      },
      {
        test: /.js$/,
        loader: 'babel-loader',
        include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]// 指明src和test目录下的js文件要使用该loader
      },
       /*
      对图片相关的文件使用 url-loader 插件，这个插件的作用是将一个足够小的文件生成一个64位的DataURL
      可能有些老铁还不知道 DataURL 是啥，当一个图片足够小，为了避免单独请求可以把图片的二进制代码变成64位的
      */
      {
        test: /.(png|jpe?g|gif|svg)(?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 10000,// 限制 10000 个字节以下转base64，以上不转
          name: utils.assetsPath('img/[name].[hash:7].[ext]') //资源发布路径;
        }
      },
      {
        test: /.(mp4|webm|ogg|mp3|wav|flac|aac)(?.*)?$/,//引用媒体
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('media/[name].[hash:7].[ext]')
        }
      },
      {
        test: /.(woff2?|eot|ttf|otf)(?.*)?$/,//引用font-icon
        loader: 'url-loader',
        options: {
          limit: 10000,
          name: utils.assetsPath('fonts/[name].[hash:7].[ext]')
        }
      }
    ]
  },
  node: {
    // prevent webpack from injecting useless setImmediate polyfill because Vue
    // source contains it (although only uses it if it's native).
    setImmediate: false,
    // prevent webpack from injecting mocks to Node native modules
    // that does not make sense for the client
    dgram: 'empty',
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
    child_process: 'empty'
  }
}

2.src--router--index,js 配置说明

import Vue from 'vue'// 引入vue框架
import Router from 'vue-router'// 引入路由依赖
import HelloWorld from '@/components/HelloWorld' // 引入页面组件，命名为Hello

Vue.use(Router)// 使用路由依赖

//  定义路由；path和component.  path 指路径，component 指的是组件
export default new Router({
  routes: [
    {
      path: '/',
      name: 'HelloWorld',
      component: HelloWorld
    }
  ]
})

3.src--main 

import Vue from 'vue' // 引入vue 框架
import App from './App'// 引入根组件
import router from './router' // 引入router 文件

Vue.config.productionTip = false // 关闭生产模式下给出的提示

/* eslint-disable no-new */
// 新建一个实例
new Vue({
  // el 为元素
  el: '#app',
  // 注入到根实例中
  router,
  // 此处为引入的根组件的App.vue
  components: { App },
  template: '<App/>'
})

4.package.json配置说明（旧版本）

{
  "name": "hello_webpack_vue",// 项目名称 
  "version": "1.0.0",// 版本
  "description": "A Vue.js project",// 描述
  "author": "",// 作者
  "private": true, //是否私人项目
  "scripts": {
    "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
    "start": "npm run dev",//运行项目命令
    "unit": "jest --config test/unit/jest.conf.js --coverage",
    "e2e": "node test/e2e/runner.js",
    "test": "npm run unit && npm run e2e",
    "lint": "eslint --ext .js,.vue src test/unit test/e2e/specs",
    "build": "node build/build.js"
  },

  "dependencies": { // 项目里使用的依赖 如果依赖包没有安装，npm 会自动将依赖包安装在，需要引入页面使用
    "vue": "^2.5.2",
    "vue-router": "^3.0.1"
  },
  "devDependencies": {//开发使用的依赖  
    "autoprefixer": "^7.1.2",
    "babel-core": "^6.22.1",
    "babel-eslint": "^8.2.1",
    "babel-helper-vue-jsx-merge-props": "^2.0.3",
    "babel-jest": "^21.0.2",
    "babel-loader": "^7.1.1",
    "babel-plugin-dynamic-import-node": "^1.2.0",
    "babel-plugin-syntax-jsx": "^6.18.0",
    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
    "babel-plugin-transform-runtime": "^6.22.0",
    "babel-plugin-transform-vue-jsx": "^3.5.0",
    "babel-preset-env": "^1.3.2",
    "babel-preset-stage-2": "^6.22.0",
    "babel-register": "^6.22.0",
    "chalk": "^2.0.1",
    "chromedriver": "^2.27.2",
    "copy-webpack-plugin": "^4.0.1",
    "cross-spawn": "^5.0.1",
    "css-loader": "^0.28.0",
    "eslint": "^4.15.0",
    "eslint-config-standard": "^10.2.1",
    "eslint-friendly-formatter": "^3.0.0",
    "eslint-loader": "^1.7.1",
    "eslint-plugin-import": "^2.7.0",
    "eslint-plugin-node": "^5.2.0",
    "eslint-plugin-promise": "^3.4.0",
    "eslint-plugin-standard": "^3.0.1",
    "eslint-plugin-vue": "^4.0.0",
    "extract-text-webpack-plugin": "^3.0.0",
    "file-loader": "^1.1.4",
    "friendly-errors-webpack-plugin": "^1.6.1",
    "html-webpack-plugin": "^2.30.1",
    "jest": "^22.0.4",
    "jest-serializer-vue": "^0.3.0",
    "nightwatch": "^0.9.12",
    "node-notifier": "^5.1.2",
    "optimize-css-assets-webpack-plugin": "^3.2.0",
    "ora": "^1.2.0",
    "portfinder": "^1.0.13",
    "postcss-import": "^11.0.0",
    "postcss-loader": "^2.0.8",
    "postcss-url": "^7.2.1",
    "rimraf": "^2.6.0",
    "selenium-server": "^3.0.1",
    "semver": "^5.3.0",
    "shelljs": "^0.7.6",
    "uglifyjs-webpack-plugin": "^1.1.1",
    "url-loader": "^0.5.8",
    "vue-jest": "^1.0.2",
    "vue-loader": "^13.3.0",
    "vue-style-loader": "^3.0.1",
    "vue-template-compiler": "^2.5.2",
    "webpack": "^3.6.0",
    "webpack-bundle-analyzer": "^2.9.0",
    "webpack-dev-server": "^2.9.1",
    "webpack-merge": "^4.1.0"
  },
  "engines": {
    "node": ">= 6.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

补充：新版本：scripts启动方式说明 

{
  "name": "hellovue",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
    "core-js": "^3.6.5",
    "vue": "^2.6.11"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "~4.5.0",
    "@vue/cli-plugin-eslint": "~4.5.0",
    "@vue/cli-service": "~4.5.0",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-vue": "^6.2.2",
    "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",
    "not dead"
  ]
}

"scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "lint": "vue-cli-service lint"
  },

启动方式为npm run serve