Node.js安装（on Windows 10）
官网
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.cmdnpm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ll, login, logout, ls, org, outdated, owner, pack, ping,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
npm@8.1.0 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.exenode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/
