使用npm命令需要先安装node.js，详细可去菜鸟教程https://www.runoob.com/nodejs/nodejs-install-setup.html

Vue-cli 是 vue 官方提供的用于搭建基于 vue+webpack+es6 项目的脚手架工具

下载vue-cli，在nodejs全局安装路径下

npm install -g vue-cli

G:\resourcesWY\vue-cli>vue init webpack vueDemo#初始化、打包、命名

? Project name vue_demo#项目名字不能有大写
? Project description A Vue.js project
? Author littleyy <156922****@qq.com>
? Vue build standalone
? Install vue-router? No
? Use ESLint to lint your code? Yes
? Pick an ESLint preset Standard
? Set up unit tests No
? Setup e2e tests with Nightwatch? No
? Should we run `npm install` for you after the project has been created? (recommended) no

   vue-cli · Generated "vueDemo".

# Project initialization finished!
# ========================

To get started:

  cd vueDemo
  npm install (or if using yarn: yarn)
  npm run lint -- --fix (or for yarn: yarn run lint --fix)
  npm run dev

Documentation can be found at https://vuejs-templates.github.io/webpack

G:\resourcesWY\vue-cli>cd vueDemo

G:\resourcesWY\vue-cli\vueDemo>npm install#安装
npm WARN deprecated babel-eslint@8.2.6: babel-eslint is now @babel/eslint-parser. This package will no longer receive updates.
npm WARN deprecated eslint-loader@1.9.0: This loader has been deprecated. Please use eslint-webpack-plugin
npm WARN deprecated html-webpack-plugin@2.30.1: out of support
npm WARN deprecated extract-text-webpack-plugin@3.0.2: Deprecated. Please use https://github.com/webpack-contrib/mini-css-extract-plugin
npm WARN deprecated browserslist@2.11.3: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
npm WARN deprecated uglify-es@3.3.9: support for ECMAScript is superseded by `uglify-js` as of v3.13.0
npm WARN deprecated chokidar@2.1.8: Chokidar 2 will break on node v14+. Upgrade to chokidar 3 with 15x less dependencies.
npm WARN deprecated bfj-node4@5.3.1: Switch to the `bfj` package for fixes and new features!
npm WARN deprecated core-js@2.6.12: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
npm WARN deprecated fsevents@1.2.13: fsevents 1 will break on node v14+ and could be using insecure binaries. Upgrade to fsevents 2.
npm WARN deprecated browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
npm WARN deprecated urix@0.1.0: Please see https://github.com/lydell/urix#deprecated

> core-js@2.6.12 postinstall G:\resourcesWY\vue-cli\vueDemo\node_modules\core-js
> node -e "try{require('./postinstall')}catch(e){}"

Thank you for using core-js ( https://github.com/zloirock/core-js ) for polyfilling JavaScript standard library!

The project needs your help! Please consider supporting of core-js on Open Collective or Patreon:
> https://opencollective.com/core-js
> https://www.patreon.com/zloirock

Also, the author of core-js ( https://github.com/zloirock ) is looking for a good job -)


> ejs@2.7.4 postinstall G:\resourcesWY\vue-cli\vueDemo\node_modules\ejs
> node ./postinstall.js

Thank you for installing EJS: built with the Jake JavaScript build tool (https://jakejs.com/)


> uglifyjs-webpack-plugin@0.4.6 postinstall G:\resourcesWY\vue-cli\vueDemo\node_modules\webpack\node_modules\uglifyjs-webpack-plugin
> node lib/post_install.js

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@~2.3.1 (node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.3.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules\watchpack-chokidar2\node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.2.7 (node_modules\webpack-dev-server\node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

added 1379 packages from 715 contributors and audited 1386 packages in 190.98s

48 packages are looking for funding
  run `npm fund` for details

found 19 vulnerabilities (3 low, 10 moderate, 6 high)
  run `npm audit fix` to fix them, or `npm audit` for details

运行
npm run dev




App.vue 引入组件标签的步骤

<template>
  <div id="app">
    <img src="./assets/logo.png">
    <!--第3步 使用组件标签-->
    <HelloWorld/>
  </div>
</template>

<script>
  //第1步  引入组件
import HelloWorld from './components/HelloWorld'

export default {
  name: 'App',
  //第2步 映射组件标签
  components: {
    HelloWorld
  }
}
</script>
<!--添加样式-->
<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>

main.js

// The Vue build version to load with the `import` command
// (runtime-only or standalone) has been set in webpack.base.conf with an alias.
/*入口JS:创建vue实例*/
import Vue from 'vue'
import App from './App'

Vue.config.productionTip = false

/* eslint-disable no-new */
new Vue({
  el: '#app',
  components: { App },/*将APP映射成组件标签*/
  template: '<App/>'
})

eslint忽略检
或者