#最新版本确认
$ npm show vue-cli
#安装
$ npm install -g vue-cli@2.9.3
#安装版本确认
$ npm -V
#命令帮助
$ vue -h

$ vue help init
Usage: vue-init <template-name> [project-name]

Options:
  -c, --clone  use git clone
  --offline    use cached template
  -h, --help   output usage information
  Examples:

    # create a new project with an official template(默认)
    $ vue init webpack my-project

    # create a new project straight from a github template(自定义)
    # GitHub用户名+子项目名+你的工程名
    $ vue init username/repo my-project

$ vue list

  Available official templates:

  ★  browserify - A full-featured Browserify + vueify setup with hot-reload, linting & unit testing.
  ★  browserify-simple - A simple Browserify + vueify setup for quick prototyping.
  ★  pwa - PWA template for vue-cli based on the webpack template
  ★  simple - The simplest possible Vue setup in a single HTML file
  ★  webpack - A full-featured Webpack + vue-loader setup with hot reload, linting, testing & css extraction.
  ★  webpack-simple - A simple Webpack + vue-loader setup for quick prototyping.

$ vue init webpack myweb
$ cd myweb
$ npm run dev
$ npm run build