Vuecli4的安装，项目的创建与运行

一、node.js的安装

        到Vue-cli官方文档查看安装指南：Installation | Vue CLI🛠️ Standard Tooling for Vue.js Developmenthttps://cli.vuejs.org/guide/installation.html

        根据要求安装Vue-cli需先安装node.js，到node中文网下载长期维护版的node.js

Node.jsNode.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.