官网

https://nodejs.org/zh-cn/

下载：16.13.0 长期维护版：

下载得到：

node-v16.13.0-x64.msi

执行msi文件，开始安装：

安装成功。

安装目录下：

Windows系统环境变量下发现 Path 的值：

X的用户变量

C:\Users\Mi\AppData\Roaming\npm

系统变量：

D:\Program Files\nodejs\

where命令可以看到两个 npm：

C:\Users\Mi>where npm D:\Program Files\nodejs\npm D:\Program Files\nodejs\npm.cmd

npm命令 其它使用：

C:\Users\Mi>npm version { npm: '8.1.0', node: '16.13.0', v8: '9.4.146.19-node.13', uv: '1.42.0', zlib: '1.2.11', brotli: '1.0.9', ares: '1.17.2', modules: '93', nghttp2: '1.45.1', napi: '8', llhttp: '6.0.4', openssl: '1.1.1l+quic', cldr: '39.0', icu: '69.1', tz: '2021a', unicode: '13.0', ngtcp2: '0.1.0-DEV', nghttp3: '0.1.0-DEV' } C:\Users\Mi> C:\Users\Mi>npm --help npm <command> Usage: npm install install all the dependencies in your project npm install <foo> add the <foo> dependency to your project npm test run this project's tests npm run <foo> run the script named <foo> npm <command> -h quick help on <command> npm -l display usage info for all commands npm help <term> search for help on <term> (in a browser) npm help npm more involved overview (in a browser) All commands: access, adduser, audit, bin, bugs, cache, ci, completion, config, dedupe, deprecate, diff, dist-tag, docs, doctor, edit, exec, explain, explore, find-dupes, fund, get, help, hook, init, install, install-ci-test, install-test, link, ll, login, logout, ls, org, outdated, owner, pack, ping, pkg, prefix, profile, prune, publish, rebuild, repo, restart, root, run-script, search, set, set-script, shrinkwrap, star, stars, start, stop, team, test, token, uninstall, unpublish, unstar, update, version, view, whoami Specify configs in the ini-formatted file: C:\Users\Mi\.npmrc or on the command line via: npm <command> --key=value More configuration info: npm help config Configuration fields: npm help 7 config [email protected] D:\Program Files\nodejs\node_modules\npm C:\Users\Mi>

node.js怎么用呢？可以去  菜鸟的Node.js 教程 看看。

后面使用Vue时会用到node.js，当然，node.js不只是给Vue使用吧。

除了npm命令，还有node命令。

>where node D:\Program Files\nodejs\node.exe

node命令 可以进入 交互式模式：

>node Welcome to Node.js v16.13.0. Type ".help" for more information. > console.log("Hello, world! in console 2021-11-02"); Hello, world! in console 2021-11-02 undefined >.exit 退出使用： 1）Ctrl+C 2）Ctrl+D 3）.exit 第三种 .exit 只需一次。

node命令 执行JavaScript脚本：

建立jswe文件，内容如下：

// hw.js console.log("Hello, World! @ 2021-11-02");

使用node命令执行脚本：

>node hw.js Hello, World! @ 2021-11-02

node帮助命令：

>node -v v16.13.0 >node --help Usage: node [options] [ script.js ] [arguments] node inspect [options] [ script.js | host:port ] [arguments] Options: ......很多，省略...... Environment variables: FORCE_COLOR when set to 'true', 1, 2, 3, or an empty string causes NO_COLOR and NODE_DISABLE_COLORS to be ignored. NO_COLOR Alias for NODE_DISABLE_COLORS NODE_DEBUG ','-separated list of core modules that should print debug information NODE_DEBUG_NATIVE ','-separated list of C++ core debug categories that should print debug output NODE_DISABLE_COLORS set to 1 to disable colors in the REPL NODE_EXTRA_CA_CERTS path to additional CA certificates file. Only read once during process startup. NODE_NO_WARNINGS set to 1 to silence process warnings NODE_PATH ';'-separated list of directories prefixed to the module search path NODE_PENDING_DEPRECATION set to 1 to emit pending deprecation warnings NODE_PENDING_PIPE_INSTANCES set the number of pending pipe instance handles on Windows NODE_PRESERVE_SYMLINKS set to 1 to preserve symbolic links when resolving and caching modules NODE_REDIRECT_WARNINGS write warnings to path instead of stderr NODE_REPL_HISTORY path to the persistent REPL history file NODE_TLS_REJECT_UNAUTHORIZED set to 0 to disable TLS certificate validation NODE_V8_COVERAGE directory to output v8 coverage JSON to UV_THREADPOOL_SIZE sets the number of threads used in libuv's threadpool Documentation can be found at https://nodejs.org/